comparator

  • Designing an Op-Amp Circuit to Detect LDR Pulses 1

Designing an Op-Amp Circuit to Detect LDR Pulses

The Problem I wanted to design a circuit to generate a nice digital pulse (for input to a microcontroller or the Raspberry Pi) every time an LDR is quickly obscured from ambient light – like for instance, when you pass your hand over it. I didn’t want to use the

By |2013-07-11T15:41:35+05:30July 11th, 2013|
  • Ambient Light sensor using an Op-Amp Comparator 2

Ambient Light sensor using an Op-Amp Comparator

Say you have a microcontroller circuit that does something when it goes dark. To save power, you want to put the chip to sleep when the ambient light drops below a certain level. One way to do this is using an LDR and an op-amp comparator. Here is the schematic:

By |2013-05-22T03:15:09+05:30May 22nd, 2013|