Joshua Kennedy owns a fridge that has a really cool ‘feature’. It beeps if the door is open for more than 60 seconds. 95% of the time this is more annoying than it is helpful. So modding it seemed to be an option.
In pursuit of this behavioural change I first tried to get at the piezo speaker so that I could rip it out. This turned out to be rather fruitless as the main board is deeply embedded within the fridge. I am not really willing to rip it out of the wall to get at the main circuit board, although I did try to tunnel my way in behind the control panel without much success:
Something I did have access to however was a daughter board that acts as the control panel for the fridge.
Reverse engineering the daughterboard, Joshua simulated operation of the data lines in Python to figure out the best way to hack it using the available signals. The chosen method was simple enough to only need a 555 timer!
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