LDR | electronut

Plotting real-time data from Arduino using Python

Arduino is fantastic as an intermediary between your computer and a raw electronic circuit. Using the serial interface, you can retrieve information from sensors attached to your Arduino. (You can also send information via the serial interface to actuate circuits and devices (LEDs, relays, servos, etc.) connected to your Arduino.) Once you have the data
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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: In the above circuit, the
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