I’m attempting to use an arduino to start the burners for my homebrew burners similar to this instructable setup - https://www.instructables.com/id/Gas-Burner-Controller/
For the ignitor, I’m using a grill ignitor that uses a single AA battery to create the spark - https://www.amazon.com/gp/product/B0722HL1T4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Connected to the push button is a relay, whose signal is comes from another relay, which is then controlled by the arduino. I also have an LCD to display the current temperature and desired temperature. The whole setup works, but I’m getting some feedback from the grill ignitor back into the arduino that ends up putting garbage onto the lcd screen.
I even attempted to isolate the power for the relay so the arduino doesn’t share the same power or ground, but I saw a similar result.
The circuit for the ignitor and relay looks like the attached image.
How can I prevent the feedback from the grill ignitor from entering the arduino?
BrewControl.ino (8.62 KB)