Radiomaster ERS-RB01 RPM Sensor for Electric Motors

RadioMaster ERS-RB01 is a brushless motor RPM sensor designed for ExpressLRS receivers. It is primarily intended for PWM ELRS receivers used in model airplanes without a flight controller. The sensor connects via UART interface and communicates using the CRSF protocol. It is compatible with receivers Radiomaster ER6, ER8, ER8G, and ER8GV as well as other ELRS receivers with a free UART port. Thanks to its UART input and output, it is possible to chain multiple sensors together.

ERS-RB01 connects with two wires to two of the three ESC phases simultaneously with the motor. The sensor measures the eRPM value, which is converted to actual RPM - revolutions per minute - after entering the number of motor poles. 

To configure the sensor and display telemetry correctly on a transmitter with EdgeTX firmware, a LUA script RadioMaster Sensor Configurator is available, which allows parameter settings and data logging for later analysis.