Within this tutorial we are going to make an LED turn on using scratch and a Raspberry Pi.
Equipment You Will Need
- 1 x red LED
- 2 x male to female jumper wires
- 1 x breadboard
- 1 x 330 ohm resistor
- Raspberry Pi
- SD Card with Raspbian installed
- HDMI cable
- Compatible Screen
- Power Supply
Lets build the circuit. Make sure you have your LED the right way round. The positive leg is the longer leg on the LED, this is represented by the bent leg in the diagram below:
The first thing we need to do is load scratch. To do this go to menu -> programming -> scratch.
- Once Scratch has opened click on the menu and drag a block into the coding area.
Next click on the menu.
Next click on and double click on Icon. This will enable the Raspberry Pi GPIO pin extension.
Next drag a block into the coding area and attach it to block.
Now click in the circle and type 18 (this is the GPIO pin we are using on the Pi).
Your code should now look like this
What The Code Does
- This tells Scratch to run the code when the green flag is clicked.
- This tells the raspberry pi to turn GPIO pin 18 on, which is where your LED is attached.
Running The Code
Now that we have finished the code to run it click . You should now see the LED turn on, if you don’t go back and see where you went wrong.