I recently coordinated the ‘tech’ for the school production of “The Wizard of Oz” and was really keen to see if there was a use for the Raspberry Pi in either the special effects or as a prop.
I decided to use the Pimoroni Unicorn Hat with a raspberry pi model A+ to provide a glowing animated heart for the Tin Man.
The code was relatively simple and I used a simple list to assign the x,y and colour data for each pixel to be used.
To give the effect of the heart beating and pulsating I gradually changed the brightness of the pixels from about 30 - 80%. It was important not to go too bright as I could have blinded the audience or other cast members!
for bright in range (30,80):
This gave a very passable beating effect which looked stunning on the stage. The Pi was powered with a portable battery pack and to make backstage life easier the code was activated from boot using crontab with.
@reboot sudo python /home/pi/Pimoroni/heart.py &
The full code can be downloaded from the icon below.