LDR with BBC micro:bit

Let’s learn to use an LDR sensor or photoresistor with BBC micro:bit.

This is a very simple project. We are going to print “BRIGHT” in the inbuild LED matrix of the micro:bit if there is light in the room or else “DARK” will be printed.

Circuit

• Connect one of the terminal of LDR to the pin 0 of the micro:bit.
• Then connect the other terminal of the LDR to the 3v of micro:bit.
• Finally, connect a 10k resistor in-between ground of the micro:bit and the pin 0.

Block Code

• Go to this link to download the code https://makecode.microbit.org/_itqDVvhv2aVC
• Or you can use the JavaScript code below.
• Maybe you have to adjust the value 1000 according to your LDR.

JavaScript Code

basic.forever(function () {
if (pins.analogReadPin(AnalogPin.P0) <= 1000) {
basic.showString("DARK")
} else {
basic.showString("BRIGHT")
}
})

Video

Tags: LDR