RPM Meter with Hall Effect Square Encoder Sensors

RPM meter with quadrature encoder using Hall effect sensors.

I use KY-035 sensors that have an AH49E analog sensor. For each motor I have placed two mechanically separated sensors in quadrature to determine the direction of rotation.

With the use of external interruptions I control the state of sensors 1 of each pair and with internal interruptions (Timer1) I count the time of the period to determine the frequency and the RPM. It used exponential decay by not detecting changes in sensor 1 of each encoder, either because the speed has dropped considerably or the motor has stopped.

On each axis of the motors I have improvised an encoder with neodymium magnets.

For starting and turning control of each motor, I use operational amplifiers (LM324N) with a joystick and a driver (L293N and L298N).

Last but not least, I have used a Schmitt Trigger inverter (SN74LS14N) to nullify the transient effect of each sensor, which avoids false readings and thus obtain with enough precision the revolutions and direction of rotation of each motor.

Code: https://github.com/DrakerDG/RPM_Meter_Direction_V3

Reference:
https://youtu.be/BAfxA7JvHsE
https://youtu.be/epU-XlbErkY
https://youtu.be/dTuYLGqXNRg
https://youtu.be/QZ8umuWt5Zw
https://youtu.be/iQrE2IDGjI8
https://youtu.be/oSBpj-XV1_o

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Видео RPM Meter with Hall Effect Square Encoder Sensors канала DrakerDG Robotics