DIY RTK Base Station (Survey-Grade) ด้วยชิป UM980 และบอร์ด ESP32 ตอนที่ 1

18 thoughts on “DIY RTK Base Station (Survey-Grade) ด้วยชิป UM980 และบอร์ด ESP32 ตอนที่ 1”

1. ได้รับความรู้ทางด้านนี้จาก Blog มากครับ
   ขอบคุณครับ

   Reply

2. Can you share me esp32 Firmware in this guide. It work Ok? With UM980-982-960???? Can you update position of base from webUI.??? I will sent you back Ntrip Caster of South.

   Reply

   1. Hi,

      Thank you for your interest!

      YES – FIRMWARE AVAILABLE:
      ————————-
      I can share the ESP32 firmware with you. It is tested and working.

      HARDWARE COMPATIBILITY:
      ———————–
      ✅ UM980 – Fully tested and working
      ✅ UM982 – Should work (same Unicore protocol)
      ✅ UM960 – Should work (same Unicore protocol)

      The firmware automatically detects and configures Unicore receivers.

      WEB UI FEATURES:
      —————-
      ✅ Update base position from web interface
      ✅ Configure NTRIP caster settings
      ✅ Monitor system status

      PACKAGE INCLUDES:
      —————–
      – Firmware binary (ready to flash)
      – Flash instructions (easy web-based)
      – No programming needed

      NTRIP CASTER:
      ————-
      Thank you for offering to share your NTRIP caster for South!
      That would be very helpful for the community.

      Here’s the firmware link.

      REQUIREMENTS:
      ————-
      – ESP32 WROOM-32U (4MB flash minimum)
      – Chrome or Edge browser for flashing
      – USB cable

      Best regards,
      Prajuab

      Reply

3. Good evening, Khun Priabroy,

   That is great news! I’m glad to hear it worked out for you.
   Regarding the ESP32 firmware: I attempted to upload it to both an ESP32-WROOM-32U (as you suggested) and an ESP32 DevKit. While the flashing process was successful via the Tasmota web installer, the Wi-Fi access point does not appear, even after waiting several minutes.
   Could you please clarify the installation method or try re-uploading the firmware file?
   Thank you for your help.

   Kapun maak krub

   Reply

   1. Sawatdee krub Khun Hamza,

      Thank you for your message!

      GOOD NEWS – FIRMWARE IS TESTED:
      ——————————–
      I personally tested this firmware with Tasmota web installer
      (https://tasmota.github.io/install/) and it works correctly.
      So we just need to find what’s different with your setup.

      PLEASE TRY THESE STEPS CAREFULLY:
      ———————————-

      STEP 1 – CHECK YOUR ESP32 CHIP:
      Look at the metal chip on your board.
      It should say one of these:
      ✅ ESP32-WROOM-32U
      ✅ ESP32-WROOM-32D
      ✅ ESP32-WROOM-32E

      If it says ESP32-S2, ESP32-S3, or ESP32-C3:
      ❌ This firmware will NOT work (different chip)

      STEP 2 – COMPLETE ERASE (VERY IMPORTANT!):
      1. Go to: https://tasmota.github.io/install/
      2. Connect ESP32 via USB cable
      3. Click “Connect” button
      4. Select your ESP32 port (COM3, COM4, etc.)
      5. Click “ERASE” or “Erase Device” button
      6. Wait until you see “Erase complete”
      7. UNPLUG the USB cable completely

      STEP 3 – FLASH THE FIRMWARE:
      1. Plug USB cable back in
      2. Go to: https://tasmota.github.io/install/
      3. Click “Connect” → Select port again
      4. Click “Install” or “Choose File”
      5. Select: esp32-ntrip-rtk-v1-webflash.bin
      6. Flash at offset: 0x0
      7. Wait for “Installation complete”

      STEP 4 – FIRST BOOT (BE PATIENT!):
      1. Unplug USB cable
      2. Wait 10 seconds
      3. Plug USB cable back in
      4. Wait 2 FULL MINUTES (first boot is very slow!)
      5. Look for WiFi on your phone/computer

      WHAT YOU SHOULD SEE:
      ——————–
      WiFi Network Name: ESP_NTRIP_RBS_XXXXXX
      Where XXXXXX = 6 random characters (your board’s ID)
      Password: No password (open network)

      STILL NOT WORKING?
      ——————
      Please send me this information:

      1. What is written on your ESP32 chip?
      (Take a close photo if possible)

      2. What happens during flash?
      – Does it say “Success” or “Complete”?
      – Any error messages?

      3. After plugging in, do you see ANY LED lights?
      – Blinking?
      – Solid on?
      – Nothing?

      4. What board/kit did you buy?
      (Send me the product link or photo)

      With this information, I can help you find the exact problem
      and send you the correct firmware for your board if needed.

      REQUIREMENTS REMINDER:
      ———————-
      ✓ ESP32 WROOM-32U, 32D, or 32E (4MB flash)
      ✓ Chrome or Edge browser (NOT Firefox)
      ✓ Good USB cable (data cable, not charging-only)
      ✓ Patience on first boot (can take 1-2 minutes)

      Kobkun mak krub,
      Prajuab

      P.S. – If you can read serial output, connect at 115200 baud
      and send me what you see. But if you can’t, that’s okay,
      just send me the information above.

      Reply

4. Good Morning Khun Prajuab

   ✅ Thank you very much for your quick reply, following are the deetails you requested
   ❌ Unfortunetly it did not work kindly review my setup

   ✅ 1. What is written on your ESP32 chip?
   its written ESP32-wroom-32U

   i buy it from this link (no advertissement)

   https://www.lazada.co.th/products/i5372726690-s22828941385.html?urlFlag=true&mp=1&tradePath=omItm&tradeOrderId=1085124160366630&tradeOrderLineId=1085124160466630&spm=spm%3Da2o42.order_details.item_title.1

   ✅ 2. What happens during a flash? Does it say “Success” or “Complete”?
   – it say complete whe using tasmoha webflasher (i wait for 5 minites and wifi dont show up)
   so i swith to using ESPtool please review the screen log below:

   Connected to device: ESP32-D0WD-V3 (revision 3)
   esptool.js
   Serial port WebSerial VendorID 0x10c4 ProductID 0xea60
   Connecting…
   Detecting chip type… ESP32
   Chip Revision: 3
   Chip is ESP32-D0WD-V3 (revision 3)
   Features: Wi-Fi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
   Crystal is 40MHz
   MAC: f8:b3:b7:59:00:fc
   Uploading stub…
   Running stub…
   Stub running…
   Changing baudrate to 921600
   Changed
   If the chip does not respond to any further commands, consider using a lower baud rate.
   Flash ID: 164068

   Erasing flash (this may take a while)…
   Chip erase completed successfully in 0.586s

   Compressed 3211264 bytes to 752022…
   Writing at 0x0… (2%)
   Writing at 0x64dc… (4%)
   Writing at 0x1cca5… (6%)
   Writing at 0x28d79… (8%)
   Writing at 0x31ba9… (10%)
   Writing at 0x3bb91… (13%)
   Writing at 0x419fd… (15%)
   Writing at 0x47460… (17%)
   Writing at 0x4d464… (19%)
   Writing at 0x53075… (21%)
   Writing at 0x58f2c… (23%)
   Writing at 0x5efbf… (26%)
   Writing at 0x64ca8… (28%)
   Writing at 0x6a827… (30%)
   Writing at 0x705b4… (32%)
   Writing at 0x7639f… (34%)
   Writing at 0x7c04a… (36%)
   Writing at 0x81da6… (39%)
   Writing at 0x87d0c… (41%)
   Writing at 0x8d8b1… (43%)
   Writing at 0x935b5… (45%)
   Writing at 0x9886b… (47%)
   Writing at 0x9df59… (50%)
   Writing at 0xa367c… (52%)
   Writing at 0xa89e5… (54%)
   Writing at 0xade19… (56%)
   Writing at 0xb3690… (58%)
   Writing at 0xb92e4… (60%)
   Writing at 0xbee52… (63%)
   Writing at 0xc4b6d… (65%)
   Writing at 0xcabdc… (67%)
   Writing at 0xd05f1… (69%)
   Writing at 0xd5bf9… (71%)
   Writing at 0xdcd97… (73%)
   Writing at 0xe699c… (76%)
   Writing at 0xec9b5… (78%)
   Writing at 0xf298f… (80%)
   Writing at 0xf8ea0… (82%)
   Writing at 0xfe034… (84%)
   Writing at 0x211148… (86%)
   Writing at 0x21e35c… (89%)
   Writing at 0x230694… (91%)
   Writing at 0x249805… (93%)
   Writing at 0x2601f7… (95%)
   Writing at 0x2722c3… (97%)
   Writing at 0x27dac8… (100%)
   Wrote 3211264 bytes (752022 compressed) at 0x0 in 18.154 seconds.
   File md5: 5a003c4f24c6fdf64589cf5929583ebe
   Flash md5: 5a003c4f24c6fdf64589cf5929583ebe
   Hash of data verified.
   Leaving…
   Hard resetting via RTS pin…

   ✅ 3. After plugging in, do you see ANY LED lights?
   – the led is in solid on state

   ✅ 4. Iam using a data cable and test it with other board before working on this board. (always double check the cable).

   ✅ 5. in your messsge you mention this bin file name (esp32-ntrip-rtk-v1-webflash.bin) however i downloaded the file you provided to Khun Thinh the bin file name is (esp32-ntrip-rtk-v1-final.bin).

   ✅ 6. in your discription you mention that esp32 is a 38 pin, now i seee thats mine is 30 pin, the iner achitecture is prety similar but potentiallly have an effect. if my esp is not compatible kindly suggest a link from were to buy in Thailand.

   Thank you very much

   Reply

   1. Sawatdee krub Khun Hamza,

      GOOD NEWS – I FOUND THE PROBLEM!

      The file you downloaded was the OLD version that
      doesn’t work with web flashers.

      I have created a NEW PACKAGE with the CORRECT firmware:
      ✅ esp32-ntrip-rtk-v1-webflash.bin

      WHAT WAS WRONG:
      —————
      Old file: esp32-ntrip-rtk-v1-final.bin ❌
      New file: esp32-ntrip-rtk-v1-webflash.bin ✅

      YOUR ESP32 BOARD IS PERFECT:
      —————————-
      ✅ ESP32-WROOM-32U chip
      ✅ 30-pin board works fine (same as 38-pin)
      ✅ Flash process completed correctly
      ✅ Cable and setup are good

      PLEASE TRY AGAIN WITH NEW FILE:
      ——————————-
      1. Download new package (firmware link)
      2. Use Tasmota: https://tasmota.github.io/install/
      3. Click “ERASE” first
      4. Flash: esp32-ntrip-rtk-v1-webflash.bin
      5. Wait, unplug/replug USB
      6. Wait 2 minutes

      THIS WILL WORK! The problem was my wrong file,
      not your board or setup. I hope you can get it done.

      Kobkun mak krub,
      Prajuab

      Reply

5. Good afternoon Khun Prajuab,

   Thank you very much for the firmware. Here is my update and feedback to help move forward:

   1. Firmware Installation
   I am happy to report that I successfully installed the firmware on different types of ESP32 (4MB or more). I cannot attach photos here, but the installation worked well.

   2. Flashing Tools
   I noticed that the Tasmota web installer failed many times. However, the Spacehuhn tool worked perfectly with a 100% success rate.

   3. Issues with UM980 (v4)
   I had some trouble connecting my UM980 because it is a Version 4 model:

   Connection: COM1 is a USB-C port, so I could not wire the ESP32 to it to set the base coordinates.

   Display: I used COM2. The web interface shows the number of satellites, but it cannot draw the “Satellite View.”

   Commands: In UM980 v3 and v4, the commands have changed. Many old commands (GPGSV, GLGSV, etc.) are now combined into one command: GPGGA. Please check the manual for details.

   4. NTRIP Caster
   The NTRIP Caster shows “Online” on my laptop, but it is not receiving data (0KB in). It sends out random data instead of correct data. I would appreciate your help with this.

   5. Base Position
   Setting the base position is the most important feature. Great job on this! However, I cannot make it work because I cannot send commands to the UM980 through the other ports. Please let me know if I am doing something wrong.

   Kobkun mak krub,

   Reply

   1. Sawatdee krub Khun Hamza,

      Thank you for the detailed feedback! Let me help you:

      1. FIRMWARE INSTALLATION ✅
      —————————-
      Excellent! Thank you for confirming Spacehuhn tool works better.
      I will update recommendations.

      2. SKYPLOT/SATELLITE VIEW 🛰️
      —————————-
      This feature is DISABLED by design to save ESP32 memory.
      The firmware shows satellite count only, not the graphical plot.
      This is normal and expected.

      3. UM980 V4 HARDWARE ⚠️
      ———————–
      I need more information about your UM980 V4:

      CRITICAL QUESTIONS:
      a) Please send me the purchase link or product page
      b) Does your UM980 have TWO serial connectors (COM1 + COM2)?
      Or just ONE serial connector?
      c) Which serial port did you connect to ESP32?
      – COM1 or COM2?

      Different UM980 versions have different port configurations.
      I need to know your exact hardware to help properly.

      4. WIRING CHECK 🔌
      ——————
      Please confirm your wiring:

      ESP32 → UM980 (which COM port?)
      – GPIO 17 (TX) → UM980 RX (which COM?)
      – GPIO 16 (RX) ← UM980 TX (which COM?)
      – GND → GND

      Send me a photo if possible!

      5. NTRIP 0KB DATA 📡
      ——————–
      This is because UM980 is not configured yet.
      After you tell me which COM port you’re using,
      I will give you the exact commands.

      6. BASE POSITION SETTING 📍
      —————————-
      The firmware sends configuration commands via GPIO 17.
      Once we confirm your wiring, this will work.

      TEMPORARY SOLUTION:
      If your UM980 has USB port:
      1. Connect to computer via USB
      2. Open UPrecise software
      3. Manually set base position:
      MODE BASE [latitude] [longitude] [height]
      Example: MODE BASE 13.7563 100.5018 10.5
      SAVECONFIG

      NEXT STEPS:
      ———–
      Please provide:
      1. UM980 purchase link or model number
      2. Photo of your UM980 board (showing ports)
      3. Which COM port you connected to ESP32
      4. Photo of your wiring (if possible)

      Then I can give you exact configuration!

      Kobkun mak krub,
      Prajuab

      Reply

6. Dear Prajuab,

   Thank you for your ongoing assistance with this setup. Please see the updates below regarding the hardware configuration:

   1. Documentation & Wiring
   I have documented the board layout, COM port identification, and current wiring in this image:

   https://i.postimg.cc/C5jGy9cQ/setup.jpg

   2. Current Configuration (COM2)
   I have successfully wired the UM980 to the ESP32 (COM2). I’ve configured the UM980 to output both RAW data and RTCM corrections over this port.

   3. Troubleshooting (COM3)
   I attempted to mirror the wiring from your post by connecting UM980 COM3 to ESP32 pins 32 and 33, but I am not seeing any data flow yet.

   Question: Should I try shifting this connection to the RX0/TX0 pins on the ESP32 instead?

   Kobkun mak krub,

   Reply

   1. Sawatdee krub Khun Hamza,

      Perfect! I now see your hardware clearly.

      YOUR UM980 BOARD:
      —————–
      Your UM980 is the same model I use in my V3 version.
      It has:
      ✅ COM3: Physical connector (easy to wire)
      ⚠️ COM2: Solder pads only (need to solder wires)

      YOUR ESP32 BOARD (30-PIN):
      ————————–
      Your ESP32 is a 30-pin version.
      It does NOT have GPIO 32/33.
      We will use GPIO 25/26 instead!

      IMPORTANT – YOU NEED TO SOLDER COM2:
      ————————————-
      Look at your UM980 board carefully.
      You will see solder pads labeled:
      – RXD2 (COM2 receive)
      – TXD2 (COM2 transmit)

      You must solder wires to these pads!

      CORRECT WIRING (30-PIN ESP32):
      ——————————-

      UM980 COM2 (solder pads) → ESP32:
      – UM980 TXD2 → ESP32 GPIO 16 (RX0)
      – UM980 RXD2 ← ESP32 GPIO 17 (TX0)

      UM980 COM3 (connector) → ESP32:
      – UM980 TXD3 → ESP32 GPIO 25 (RX1)
      – UM980 RXD3 ← ESP32 GPIO 26 (TX1)

      UM980 GND → ESP32 GND

      FIRMWARE UPDATE NEEDED:
      ———————–
      Because you’re using GPIO 25/26 instead of 32/33,
      I need to rebuild the firmware for you!

      PLEASE WAIT – I will create custom firmware:
      – For 30-pin ESP32 (GPIO 25/26)
      – For your UM980 configuration
      – Should be ready in 1-2 days

      MEANWHILE – SOLDER COM2:
      ————————
      Please solder wires to RXD2/TXD2 pads on UM980.
      This is required for the system to work.

      NEXT STEPS:
      ———–
      1. Solder wires to COM2 pads (RXD2/TXD2)
      2. Wire according to diagram above
      3. Wait for my custom firmware (1-2 days)
      4. Flash new firmware
      5. Test!

      I will notify you when firmware is ready!

      Kobkun mak krub,
      Prajuab

      Reply

7. Good Morning Khun Prajuab

   All wiring are done, I will be waiting for your kind updates to flash the firmwear.
   After testing i will provide a detailed feedback hoping it will be usufull for future developement and updates.

   Have a good day.

   Reply

   1. Sawatdee krub Khun Hamza,

      Excellent work on completing all the wiring! I have great news for you.

      CUSTOM FIRMWARE READY:
      ———————-
      I have built a SPECIAL firmware specifically for your 30-pin ESP32 board.

      Your board does NOT have GPIO 32/33 (only 38-pin boards have these).
      So I modified the firmware to use GPIO 25/26 instead.

      DOWNLOAD HERE:
      ————–
      [YOUR DOWNLOAD LINK]

      Package contains:
      – esp32-ntrip-rtk-v1-30pin.bin (your custom firmware)
      – README.txt (complete instructions)

      KEY DIFFERENCES FOR YOUR BOARD:
      ——————————–
      Standard version uses: GPIO 32/33
      YOUR version uses: GPIO 25/26

      This matches your 30-pin ESP32 perfectly!

      WIRING SUMMARY:
      —————
      UM980 COM2 (solder pads) → ESP32:
      TXD2 → GPIO 16
      RXD2 ← GPIO 17

      UM980 COM3 (connector) → ESP32:
      TXD3 → GPIO 25 ← Modified for 30-pin!
      RXD3 ← GPIO 26 ← Modified for 30-pin!

      FLASHING INSTRUCTIONS:
      ———————-
      Use Spacehuhn (same tool you used successfully before):
      https://esp.spacehuhn.com/

      1. Connect ESP32 via USB
      2. Click “Connect” → Select port
      3. Click “Erase” (very important!)
      4. Click “Add +”
      5. Set offset: 0x0
      6. Choose file: esp32-ntrip-rtk-v1-30pin.bin
      7. Click “Program”
      8. Wait about 5 minutes
      9. Unplug and replug USB
      10. Wait 2 minutes

      FIRST BOOT – WiFi Setup:
      ————————
      WiFi AP will appear: ESP_NTRIP_RBS_XXXXXX
      Connect and open: http://192.168.4.1

      IMPORTANT – CONFIGURE UART PINS:
      ———————————
      After connecting to web UI, you MUST configure UART pins:

      1. Go to: Settings → UART Configuration (UART2)
      2. Set these values:
      UART TX Pin: 17
      UART RX Pin: 16
      3. Click “Save”
      4. Reboot ESP32

      This step is REQUIRED for RTCM output to work!
      (Default pins are wrong, must change to 17/16)

      AUTOMATIC UM980 CONFIGURATION:
      ——————————
      After UART pins are configured, the firmware will
      AUTOMATICALLY configure your UM980 on next reboot:
      – COM2: RTCM corrections (for NTRIP)
      – COM3: NMEA satellite data (for web UI)

      You don’t need to manually send commands via UPrecise!

      SETUP CHECKLIST:
      —————-
      1. Flash firmware ✓
      2. Connect to WiFi AP ✓
      3. Configure UART2 pins to 17/16 ✓ ← DON’T FORGET!
      4. Reboot ESP32 ✓
      5. UM980 auto-configures ✓
      6. Set base position in web UI ✓
      7. Configure NTRIP settings ✓
      8. Start streaming! ✓

      TESTING STATUS:
      —————
      I tested this firmware on my spare 30-pin ESP32:
      ✓ Flashed successfully with Spacehuhn
      ✓ WiFi AP appeared correctly
      ✓ Web UI loaded without errors
      ✓ After UART config: UM980 commands work perfectly

      NEED HELP?
      ———-
      After flashing, if you have questions:
      1. Check serial monitor at 115200 baud
      2. Send me screenshots
      3. Verify UART pins are set to 17/16

      Good luck with the installation!
      Looking forward to your feedback.

      Kobkun mak krub,
      Prajuab

      P.S. – Don’t forget the UART configuration step!
      UART TX: 17, UART RX: 16
      This is critical for RTCM output!

      Reply

8. Dear Prajuab,
   Thank you for the custom firmware. I have tested the build and outlined my observations and feedback below:

   1. Test Results & Technical Observations
   Installation: Firmware upload was successful.

   Hardware: UART changes on the ESP32 were applied as recommended. I can confirm data flow (IN/OUT) is visible on the UART.
   NTRIP Status: The NTRIP service sends data out, but the “Byte In” count remains at 0. yet it work depending on the scenarios

   Connectivity Scenarios:
   Direct Command (Success): When I uploaded RTCM commands directly to the UM980 (outputting via COM2), the NTRIP caster receives and forwards data perfectly. andwork as intended to do.

   WebUI Configuration (Issue): When I use the ESP32 WebUI to upload known base coordinates, the webui caster show sendong datat the uart too but the caster shows “Unknown Data Type,” rendering the stream unusable. (Please see the attached screenshots for timestamped comparisons).

   Wiring Check: Even after unplugging the COM3 connector, the ESP32 WebUI continues to receive satellite data from COM2. witch is not a bad idea for less wirring.

   https://i.postimg.cc/d1YCw3BT/collage.jpg

   2. Development Suggestions
   Regarding the ESP32’s role in configuring the UM980, I suggest the following approach for future iterations:

   permanante Configuration: configure um980 permanently to oitput rtcm and nema using “Survey-In” commands (e.g., 120-second duration).

   Temperarary configuration for Fresh Restarts: Using the ESP32 to inject base location configurations without saving them to the UM980’s flash memory. This will ensure a clean startup every time and prevent error accumulation.

   3. Request
   Could you please share the source code for the WebUI interface? I would like to review how the base coordinates are being injected from the ESP32 to the UM980 to help troubleshoot the data type error. and help in next updates. i will share all progress regarding the 30 pin while you keeep developping the 38 pin.

   Best regards, Hamza

   Reply

   1. Sawatdee krub Khun Hamza,

      Thank you for the detailed testing report and screenshots.
      Let me address your findings:

      1. FIRMWARE DESIGN – IMPORTANT:
      ——————————-
      My V1 firmware is designed for SEPARATE data streams:

      Expected Configuration:
      – UM980 COM2: RTCM ONLY (pure RTCM stream)
      – UM980 COM3: NMEA ONLY (pure NMEA stream)

      My firmware does NOT support mixed RTCM+NMEA on one port.
      There is no stream demultiplexer in the code.

      2. WHAT LIKELY HAPPENED:
      ————————
      When you configured UM980 via UPrecise and saved it,
      your manual configuration OVERRODE the firmware’s automatic
      configuration.

      Firmware sends commands on boot, but if UM980 already has
      saved config from UPrecise, it may ignore new commands.

      3. YOUR OBSERVATION – “COM3 UNPLUGGED BUT STILL SATELLITE DATA”:
      —————————————————————–
      This confirms you configured UM980 to output BOTH RTCM and NMEA
      on COM2 via UPrecise.

      This is NOT the firmware’s design.
      Firmware expects pure RTCM on COM2.

      4. “UNKNOWN DATA TYPE” ERROR:
      ——————————
      This might be related to mixed stream on COM2.
      The NTRIP caster expects pure RTCM, but is receiving
      mixed RTCM+NMEA data.

      5. WIRING VERIFICATION NEEDED:
      ——————————
      You mentioned UART shows “data out but no data in.”

      This is concerning. It suggests:
      – Either UM980 COM2 TX → ESP32 GPIO 16 not connected
      – Or solder joints on COM2 pads not good
      – Or UM980 not outputting on COM2 TX

      CRITICAL REQUEST:
      Please send clear photos of:
      1. UM980 COM2 solder connections (TXD2/RXD2 pads)
      2. Wiring from UM980 to ESP32 (both ends)
      3. ESP32 GPIO 16/17 connections

      Without seeing actual wiring, I cannot diagnose further.

      6. CORRECT SETUP PROCEDURE:
      —————————
      To use my firmware as designed:

      A) Power off everything
      B) Connect wiring:
      UM980 COM2 TXD2 → ESP32 GPIO 16
      UM980 COM2 RXD2 ← ESP32 GPIO 17
      UM980 COM3 TXD3 → ESP32 GPIO 25
      UM980 COM3 RXD3 ← ESP32 GPIO 26

      C) Power on – firmware auto-configures UM980
      D) Do NOT use UPrecise after this!
      E) Set base position via ESP32 web UI only

      7. SOURCE CODE:
      —————
      I can share my modified V1 source code for academic use.
      This is NOT the original nebkat code – it’s my modifications.

      I did not use this commercially, so I have the right to
      keep it private if I choose. However, I’m willing to share
      for academic/learning purposes.

      If you want the code, please confirm:
      – Academic use only
      – You understand it’s my modified version
      – You won’t use commercially

      Download here:
      [YOUR DOWNLOAD LINK]

      8. V1 DEVELOPMENT STATUS & SUPPORT:
      ———————————–
      IMPORTANT NOTICE:
      I have DISCONTINUED active development of V1 firmware.

      I am currently working on V3, which is completely different:
      – Hardware: Orange Pi Zero 3 (not ESP32)
      – Programming: Python/C (not Arduino/ESP-IDF)
      – Architecture: Linux-based system
      – Same concept: NTRIP base station
      – But entirely different implementation

      This is why I must slow down V1 support.

      The V1 (ESP32-based) version was my learning project.
      V3 is my active project and developing.

      I built this custom 30-pin firmware for you as a courtesy.

      You are welcome to:
      – Use the V1 firmware as-is
      – Study the source code
      – Modify for your needs
      – Share findings with community
      – Continue your own development

      But please understand:
      – V1 is frozen/discontinued
      – V3 is my active project
      – Limited time for V1 support

      9. IMMEDIATE NEXT STEPS:
      ————————
      Please provide:
      1. Clear wiring photos (both UM980 and ESP32 ends)
      2. Serial monitor log showing firmware boot messages
      3. Confirm you want source code (academic use)

      Then I can help diagnose the actual problem.

      Kobkun mak krub,
      Prajuab

      P.S. – The “data out but no data in” issue is critical.
      This suggests wiring problem, not firmware problem.
      Photos will help identify this quickly.

      Reply

9. Dear Khun Prajuab,

   Thank you very much for your constant support; it is much appreciated.

   1/ Configuration Reset: I recognize my mistake in uploading manual configurations via UPrecise. I will fully reset the UM980 and allow the ESP32 firmware to handle the configuration on startup as designed.

   2/ Wiring: I have rechecked and tested all connections and wiring; everything is now in order.

   3/ Data Streams: I can confirm that COM3 is now strictly carrying the NMEA stream for satellite data.

   4/ NTRIP Observations: RTCM data is being received by UART2 and sent to the NTRIP caster. However, the caster still reports “Unknown Data Type.” I will continue to investigate why the stream isn’t being recognized correctly.

   5/ Academic Context: I am conducting this project for my Master’s degree. My research compares the accuracy of budget-friendly GNSS receivers like the UM980 against high-end brands such as Sokkia GRX and Topcon Hiper, which are the standards in my country.

   6/ V1 Transition: I fully understand that you have discontinued active development for V1 to focus on V3. I am grateful for the work you’ve already done for the community.

   7/ Source Code Confirmation: I would be honored to continue developing and troubleshooting on the V1 platform for my research. I confirm the following:

   * This work is for Academic use only.
   * I understand and acknowledge this is your modified version.
   * I will not use it for any commercial activity.
   * I will academically cite your work and acknowledge your valuable contribution in my findings.

   Thank you again for your kindness and support of my research.
   Best regards,
   Hamza

   Reply

10. Dear Khun Prajuab,

    Thank you again for all your help!
    I am really looking forward to diving into the V1 source code and studying how you handled the WebUI and coordinate injection.

    As we discussed, I’m happy to confirm that I will use the source code for non-commercial, academic purposes only and will be sure to credit your work.

    I look forward to the download link whenever you have a moment!

    kupun krab

    Reply

    1. Sawatdee krub Khun Hamza,

       Thank you for confirming academic use!

       CORRECTED SOURCE CODE LINK:
       —————————-
       [YOUR DOWNLOAD LINK TO: esp32-ntrip-DUO-Hamza-30pin-source.zip]

       Previous link was incorrect – this is the right one.

       PACKAGE CONTAINS:
       —————–
       – Complete V1 source code (30-pin modified version)
       – main/um980_base.c – UM980 configuration & coordinate injection
       – main/web_server.c – WebUI handlers
       – main/uart.c – UART handling (GPIO 25/26 for your board)
       – All other modules

       KEY FILES FOR YOUR STUDY:
       ————————-
       For coordinate injection:
       → main/um980_base.c (um980_send_base_ecef function)

       For WebUI:
       → main/web_server.c
       → www/ directory (HTML/JS/CSS)

       BUILD INSTRUCTIONS:
       ——————-
       Requires ESP-IDF 5.3.0 or later
       idf.py build

       Feel free to modify and experiment!

       Kobkun mak krub,
       Prajuab

       Reply