This project demonstrates the use of a Light Dependat Resistor (LDR) . LDRs typically have very high resistance in the absence of light. When light falls on it , the resistance drops very quickly. LDRs of various sizes are available in the market. Any size could be used for this project. The circuit is very simple and schematic for thr same is given in the below diagram.

otos give the assembly on breadboard.

Well, this is my first instruct able (yay) so, here it goes! This is a Dark Detector circuit that utilizes 1) the a stable oscillator that you can make with a 555 to drive a Pietro and 2) the reset threshold of the chip.

step 1Step One: Gather the Parts

_Parts_ 555 Timer IC (I used a Texas Instruments NE555P, you can use pretty much any other brand) A breadboard (doesn't have to be big) Some wire; bare or stripped (yo…

step 2Step Two: Put the timer in

Stick the timer in the breadboard so that the notch and/or circle is facing to the left.

step 3Step T ... Read more »