Copyright (C) 2015 - 2016 mru@sisyphus.teil.cc
This is a telemetry module targeting RC cars.
- Uses Bluetooth Smart (Bluetooth Low Energy) as transport
- Uses your Android phone to display the data
It currently supports
- Cell voltages (either through ADS1115 or nRF51-builtin ADCs)
- Total battery current (via http://www.dx.com/p/new-apm-osd-90a-voltage-current-sensor-connector-power-module-black-red-297400#.VrZpt99yuis, through ADS1115)
- Accelerometer (through ADXL345)
The hardware is currently just the modules hand-wired on a perfboard. No proper PCB is planned yet. Hardware is cheap stuff from dx.com.
The telemetry module is built around the nRF51 SoC. I used a BLE Nano (http://redbearlab.com/blenano/), it nicely combines a DCDC and the nRF51.
The firmware source can be found in the firmware directory, a pre-built binary is available in release/target.hex.
The app source is available in the app directory. A pre-built binary is available in release/Application-release-unsigned.apk
It is possible to run the telemetry model with different hardware configurations.
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Only cell voltages
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Requires only the BLE Nano module
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Accelerometer ADXL345
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Cell current
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Add the ADS1115 ADC
The module is just the following modules wired together.
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make the app better
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almost no error handling, no UX
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draw own pcb,
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current sensor
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INA219
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find a better nRF51 module, https://www.nordicsemi.com/Products/3rd-Party-Bluetooth-Smart-Modules
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or even Microchip RN2040