Here’s the example circuit: And a schematic: The 4.7kΩ resistor on the ground side, and the photocell on the 5V side, means as the cell’s resistance increases (meaning the sensor’s surroundings are getting darker) the voltage on A0 will decrease.
Note: This example assumes you are using the latest version of the Arduino IDE on your desktop.
It’s an extremely cost-effective Wi Fi module, that – with a little extra effort – can be programmed just like any microcontroller.
Unfortunately, the ESP8266 has mostly only been available in a tiny, modular form, which, with limited I/O and a funky pin-out, can be difficult to build a project around.
They’re easy-to-use, and an essential component in projects that require ambient-light sensing.
If you have a resistor kit, you may want to introduce some trial-and-error to hone in on that perfect static resistance.
In this example, we’ll use a 4.7kΩ resistor to divide voltage with the photocell.
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