Raspberry Pi LESSON 30: Controlling LEDs from Push Buttons

In this lesson we will show how you can control LED’s from push buttons. In order to get started, you will want to expand the circuit we built in LESSON 29 to include two LEDs. The schematic below shows how you will want to hook things up (Also, remember you can see the Raspberry Pi pinout in LESSON 25). Also, as we have mentioned before, if you want to follow along with us in these lessons you can get a kit that has all the gear you need HERE.

This Circuit Controls two LED from Push Buttons Using the Raspberry Pi

In the video lesson, we take you through the code step-by-step. We use the techniques learned in LESSON 29 to detect if a button has been pushed. We introduce two new variables, BS1 and BS2, so indicate the state of the LED’s. A BS1=False means the LED1 is off. A BS1=True means the LED is on. This concept allows us to determine whether we should turn the LED on or off when the button is pushed. Basically, we want to put it in the opposite state when a button is pushed. The code is below. The video shows how it works.