StudioShemp / ESP32-GPS-Speedo

En ESP32 based GPS Speedometer with 2 modes (made to measure the speed of my son's RC cars, but also perfectly good as a portable GPS/Speedometer)

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ESP32 GPS-Speedo

En ESP32 based GPS Speedometer with 2 modes (made to measure the speed of my son's RC cars, but also perfectly good as a portable GPS/Speedometer)

I built this as a speedo to tape to my son's RC car (Rustler VXL) to measure speed and assist tuning, but it has all typical GPS and speedo functions too, selectable from a pushbutton on D27.

Parts list

  • a four pin 0.96 OLED module for the display connected via SDA/SCL
  • Neo 6M or 7M GPS module. I used a UBX2828/VK2828 all in one module from AliExpress
  • An ESP32 module that exposes SDS/SCL and hardware serial RX/TX. I started with a ESP32 DevKit C, which worked fine - but as it needed to be portable I switched to a DFRobot Firebeetle ESP32-E (DFR0654) because of its embedded LiPo charging and battery management.
  • I'm running a tiny 801437 LiPo and it provides hours of use before needing a charge.

Build decisions:

I used one of the two available embedded Serial hardware UARTS for the GPS I/O. In this case the second UART, pins 16/17 - RX2/TX2 so I wouldn't have issues uploading code (flashing uses RX/TX on pins 1 and 3 and it's likely a cause of a lot of "esptool won't upload" issues in forums when they are otherwise used). Of course you could assign software serial to other pins and change the code - but why wast perfectly good serial hardware UARTS)

Dependencies:

I'll add the STL files for the case to Thingyverse soon. I'm still prototyping.

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En ESP32 based GPS Speedometer with 2 modes (made to measure the speed of my son's RC cars, but also perfectly good as a portable GPS/Speedometer)

License:GNU General Public License v3.0


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