Add quadrature encoders to your micro metal gearmotors (extended back shaft version required) with this kit. The installed system does not exceed the 12 mm × 10 mm cross section of the motors and extends only 5 mm beyond the plastic motor end cap. The 3-tooth wheel provides 12 counts per revolution; Using the 5-tooth wheel yields 20 counts per revolution. To compute the encoder counts per revolution of the gearbox output, multiply by the gear ratio This version is intended for use at 3.3 V. Because the encoder board outputs are direct phototransistor outputs, some signal conditioning is often necessary between the sensor and a digital system processing the signals.The encoder board is designed to be soldered directly to the back of the motor, with the back shaft of the motor protrudingthrough the hole in the middle of the circuit board. The better aligned the board, the better the output signal quality will be. One way to achieve good alignment is to tack down the board to one motor pi