4017 Counter

The 4017 is an IC that is able to count up to ten. It has 10 outputs that will each go HIGH (turn on) in sequence. The count advances whenever a pulse comes in to the clock pin. The output (pin3) of a 555 Timer in astable mode works really well as a clock for the 4017.




How to Use It?

Below is an example that shows how to count to a certain number (from 0 to 2 in this case). Note that the reset pin is connected to OUTPUT 3 (pin 7).

You can keep adding more LEDs to the outputs if you want to count to a higher number. We are blinking LEDs, but you could also control other things with a transistor.

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What Can You do With It?