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47 lines
3.2 KiB
Markdown
47 lines
3.2 KiB
Markdown
# HGD4_reversed
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Information about the LOCO Track Primary HGD4 GPS tracker
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| Component | Type | Note | Marking |
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|--------------------------------|--------------------------|-----------------------------------------------|--------------|
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| nRF52840 | SoC | Main SoC, 1MB Flash, 256KB RAM | U1 |
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| ESP8266 | WiFi SoC | 2MB external Flash, running AT firmware | IC8 |
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| Quectel BG95-M3 | LTE Modem with GPS | USB exposed to debug pads | M1 |
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| LIS3DH | Acceleration Sensor | Two units present | U2 |
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| LIS3DH | Acceleration Sensor | Two units present | U3 |
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| VEML6035 | Light Sensor | Next to push button, used for wake-up | IC7 |
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| ENS210 | Temperature + Humidity Sensor | - | IC3 |
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| TPL5010 | Watchdog | needs to be fed | IC4 |
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| Unspecified Pressure Sensor | Pressure Sensor | - | IC5 |
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| Red LED | LED | - | LED1 |
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| Green LED | LED | - | LED2 |
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| Button | Push Button | Wakes the device power off | SW1 |
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What we know about the pins of the nRF52840 so far:
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| Pin | Description |
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|----:|-----------------------------------------------|
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| 0 | !LED Green |
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| 1 | !RED Green |
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| 2 | Power Latch - High Z * High -> Stay on -> Low hard power off |
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| 4 | CS ACCL 2 ? |
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| 6 | CS ACCL 1 ? |
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| 8 | MISO? |
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| 9 | TPL5010 Wake input |
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| 10 | TPL5010 Done output |
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| 12 | SPI CLK ? |
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| 13 | SCL |
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| 15 | SDA |
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| 17 | Modem Rxd GPIO ? |
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| 22 | Modem Txd GPIO ? |
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| 29 | Modem + ESP power, switches the actual rail |
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| 32 | Uart logging Rxd (broken out gpio) |
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| 33 | Uart logging Txd (broken out gpio) |
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| 34 | Modem !pwrkey |
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| 41 | MOSI ? |
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| 42 | Wifi Rxd ? Baud 115200 |
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| 43 | Wifi Txd ? Baud 115200 |
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| 45 | ESP power pin |
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