Image result for pir ldr circuit

Image result for pir ldr circuit

I am using LASER and LDR for this purpose. From the transmitter, I will send low frequency pulses using LASER to the receiver. The LDR on receiver side will receive these pulses in form of LASER light. It will trigger monostable multi-vibrator to regenerate same pulses. These pulses will further drive the stepper motor through driver circuit. So as anyone changes pulse frequency from transmitter, the stepper motor speed will change accordingly

pin 2

Ideas for the setup of your LDR circuit. Has Arduino

pin 1
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