Apparently for slow RPM, its best to measure the time, but for fast RPM its best to count pulses. Intuitively that seems to be right as the pulses are much closer together with fast RPM, so CPU clock ...

FC-33 (LM393) infrared speed sensor is used to measure the RPM of the motor. In addition, we can increase or decrease the speed by controlling the speed of the motor with the potentiometer used in the ...

- Arduino Nano microcontroller - LCD display - Ultrasonic sensor - and LED diode For that purpose we need to take two distance measurements in a short time apart and we have: distance2 - distance1 = ...

The square wave generated by the sensor module is available at digital pin no. 2 (interrupt pin INT0) of the Arduino. The DC motor’s speed is checked every ten seconds. Since the disc has 20 holes, ...

The sensor sends “hit” signals to a small Arduino Uno via a PC817 optocoupler. The headcount is then displayed on a small LCD screen positioned above the speed bag, allowing you to keep track ...

DAOKAI 5PCS LM393 Comparator Speed Sensor Module Slot Type IR Optocoupler for Motor Speed Detection Also for MCU Arduino, with Dupont Wire , Comimark 4PCS Tilt Sensor Module Vibration Sensor for ...

Why not create your very own high speed camera trigger using a Arduino, piezoelectric sensor ... DIY Arduino High Speed Photography DSLR Trigger. 4:35 pm November 10, 2010 By Julian Horsey.

I made this project because I wanted a way to automatically control the speed of a DC fan according to the temperature read by a LM35 sensor. I had a few problems with the PWM part mainly because the ...