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Jonas Niesner
2025-07-06 21:47:07 +02:00
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# HGD4_reversed # HGD4_reversed
Information about the LOCO Track Primary HGD4 GPS tracker Custom firmware and information for the LOCO Track Primary HGD4 GPS tracker
![pinout](https://github.com/jonasniesner/HGD4_reversed/blob/main/pinout.webp?raw=true) ![pinout](https://github.com/jonasniesner/HGD4_reversed/blob/main/pinout.webp?raw=true)
The following tables where reversed from the hardware version 1.1, we know of the following version 1.1 1.4 1.6 1.6a. The other versions still have to be reversed properly. To get startet, connect a jlink programmer to GND and SWDIO and SWCLK pins. Then connect a 5-6V power supply or battery to the battery port and press the power button.
After that you can upload the NRF firmware part. The esp does not need custom firmware at the moment.
You will most likely have to replace the sim card and adjust the config for it and the backend server you intend to use.
The following tables where mainly reversed from the hardware version 1.1, we know of the following version 1.1 1.4 1.6 1.6a. All of those versions should be compatible
| Component | Type | Note | Marking | | Component | Type | Note | Marking |
@@ -14,9 +18,10 @@ The following tables where reversed from the hardware version 1.1, we know of th
| LIS3DH | Acceleration Sensor | Two units present | U2 | | LIS3DH | Acceleration Sensor | Two units present | U2 |
| LIS3DH | Acceleration Sensor | Two units present | U3 | | LIS3DH | Acceleration Sensor | Two units present | U3 |
| VEML6035 | Light Sensor | Next to push button, used for wake-up | IC7 | | VEML6035 | Light Sensor | Next to push button, used for wake-up | IC7 |
| ENS210 | Temperature + Humidity Sensor | - | IC3 | | ENS210 | Temperature + Humidity Sensor | only on hw version 1.1 and 1.4 | IC3 |
| TPL5010 | Watchdog | needs to be fed | IC4 | | TPL5010 | Watchdog | needs to be fed | IC4 |
| LPS22HB | Pressure Sensor | - | IC5 | | LPS22HB | Pressure Sensor | only on hw version 1.1 and 1.4 | IC5 |
| ENS220 | Pressure Sensor | only on hw version 1.6 and 1.6a | IC5 |
| Red LED | LED | - | LED1 | | Red LED | LED | - | LED1 |
| Green LED | LED | - | LED2 | | Green LED | LED | - | LED2 |
| Button | Push Button | Wakes the device power off | SW1 | | Button | Push Button | Wakes the device power off | SW1 |