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https://github.com/makermoekoe/lora-gps-tracker

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Host: GitHub
URL: https://github.com/makermoekoe/lora-gps-tracker
Owner: makermoekoe
License: gpl-3.0
Created: 2022-05-20T08:24:33.000Z (over 2 years ago)
Default Branch: main
Last Pushed: 2022-07-04T08:19:29.000Z (over 2 years ago)
Last Synced: 2024-11-09T22:51:29.569Z (about 2 months ago)
Language: C++
Size: 6.63 MB
Stars: 209
Watchers: 15
Forks: 67
Open Issues: 1
Metadata Files:
- Readme: README.md
- License: LICENSE

Awesome Lists containing this project

README

        # LORA-GPS-Tracker

**This page is a work in progress!**



This LORA-GPS-Tracker was designed to just test three modules, which I haven't worked with yet: the RFM95 LORA module, the ESP32-S2-Mini module and the ATGM336h GPS module. All combined this device can be used as a GPS-Tracker for LORA based systems. Additionally to the modules, the board includes a 0.96" OLED display, two user buttons, a user RGB LED, a LiPo battery charger with a 16340 cell holder, and a dual LDO setup, which is very handy when it comes to deep sleeping.

Here are some specs of the board:

- ESP32-S2-Mini

- USB Type-C for charging the battery and flashing the ESP32

- Dual LDO setup, which will reduce the sleep current (the main power sinks can be shut down before entering a sleep mode)

- Power friendly OLED display

- Dimensions are 60x43mm

The [Youtube Video](https://youtu.be/C7jFupvuy9M) shows the PCB assembly process, some initial tests and some power measurements.

## Connections

The RFM95 LORA module is connected via SPI, the ATGM336h GPS module is connected via UART and the OLED display is connected via I2C.

GPIO ESP32 | Function | Mode

-------- | -------- | --------

GPIO1 | LORA_RST | Output

GPIO2 | LORA_MISO | Input

GPIO3 | LORA_MOSI | Output

GPIO4 | LORA_SCK | Output

GPIO5 | LORA_CS | Output

GPIO6 | LORA_INT | Input

GPIO7 | LORA_DIO1 | Data

GPIO8 | LORA_DIO2 | Data

GPIO12 | Button2 | Input

GPIO14 | Enable LDO2 | Output

GPIO15 | BAT_ADC | Input

GPIO16 | Button1 | Input

GPIO19 | USB_DN | Data

GPIO20 | USB_DP | Data

GPIO34 | OLED_RST | Output

GPIO35 | I2C_SCL | Output

GPIO36 | I2C_SDA | Data

GPIO37 | LED_CLK | Output

GPIO38 | LED_SDI | Data

GPIO40 | GPS_PPS | Input

GPIO41 | GPS_RXD | Input

GPIO42 | GPS_TXD | Output

By switching off the EN_LDO2 output, the second LDO which powers the GPS as well as LORA module, the onboard LED and the OLED display, will be shut down.

## Power measurements



State | Avg. current | Peak current

-------- | -------- | --------

Reading sensors | 80mA | 92mA

Transmitting LORA | 135mA | 208mA

Deep sleep | 75µA | 82µA

Note: The schematics in this repo have the I2C pull-up resistors connected to +3V3. It reduces the power consumption if you don't mount these resistors or if you connect them to VDD (controllable via LDO2).