As you might have noticed, the 38-KHz pulse generator is built around the evergreen timer chip NE555P (IC1). Here, the RC components (R5-C3-P1) set the astable frequency to drive the infrared light ...

Create an RPM counter (tachometer) with Arduino using an IR sensor and LCD module. This project calculates RPM based on sensor interrupts and displays the result on a 16x2 LCD. Perfect for measuring ...