Arduino Smart Bike Trainer

The goal of this project is to develop a connected indoor trainer starting from the Tacx Flow (T1680) trainer combined with a Arduino Nano 33 BLE using the CSC profile.

https://github.com/krisc-informatica/arduino-smart-bike-trainer implements the FTMS Profile (Fitness Machine Service) as it appears to be incompatible with the CSC profile when advertised in the same code. For example, the BKOOL software was working incorrectly when receiving both service data.

The trainer cable

According to https://hackaday.io/project/164276-tacx-flow-ant-conversion the cable layout of the RJ10 connector on the Tacx Flow is as follows:

1. Cadence signal to computer (one pulse per crank revolution), 3.3V pulses, pulled high (no pulse => 3.3V)
2. GND/Common.
3. PWM control signal to brake (2.6V pulses).
4. AC power / synchronization signal to computer, ~23V AC signal which appears the +ve part is clipped at ~19.5V (see picture).
5. +18V (~1.5V variation sawtooth profile).
6. Speed signal to computer (4 pulses per brake axle revolution) 3.3V pulses, pulled high (no pulse => 3.3V)

BLE information that might be useful

• BLE Base UUID: 00000000-0000-1000-8000-00805F9B34FB
  • 16-bit UUID to 128-bit: 0000xxxx-0000-1000-8000-00805F9B34FB
  • 32-bit UUID to 128-bit: xxxxxxxx-0000-1000-8000-00805F9B34FB