Scratch GPIO – PiGlow Support

Controlling a Pimoroni PiGlow using ScratchGPIO

This is a little fun add on from the Pimoroni gang with 18 high brightness LEDs on it.

To get an add-on like this to work on a Raspberry Pi (it uses what’s called the I2C protocol)  you need to run a few little things using LX Terminal.

sudo apt-get install i2c-tools


sudo apt-get install python-smbus

and finally a little tool to enable the I2C pins to be used for this purpose


followed by

sudo bash

Then once you’ve rebooted – come back here 🙂

Make sure you’ve installed ScratchGPIO of course

PiGlowAddonOnce you’ve added I2C support to your Raspberry Pi then just create a variable called AddOn and set it to PiGlow as the first line in your Green Flag event.

You can then create variables Led1 to Led18 and set them to values between 0 (for off) to 255 (Fully on). You can also have variables for Red,Orange,Yellow,Green,Blue and White to refer to each of the colours and the the same for Leg1, Leg2 and Leg3.

PiGlowLegAs usual, you can use also use simple broadcasts instead of creating variables and say things like Broadcast Led1On to switch LED1 on

This script shows a how using the the join statement you can blink each leg in turn without having to use a lot of if statements.

19 thoughts on “Scratch GPIO – PiGlow Support

  1. I’ve very carefully followed the instructions given above (following the links to other pages and checking there are no error messages on each install) hoping the get the PiGlow working for my daughter to play with.

    Unfortunately the PiGlow has still not come to life and I wondering how else I can troubleshoot the system.

    Any help would be much appreciated.

  2. I cant get the pi glow working with Python,but no luck using ScratchGPIO4 or 4plus. I have followed you instructions to the letter. Any help would be appreciated.

  3. Thanks Simon. Great job.
    It was something fun for me to switch on and off the PiGlow LEDs with Python. But it’s even better with Scratch! Looking forward to showing my son this.
    Keep up the good work. Valuable resources!

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