I acquired a bread-making machine. See control board image. I want to use the machine for other purposes and control the buttons, paddle, heater & 7-segment display with an Uno. As it stands, the machine provides 0V, -5V & -11V to the control board.
Is it possible to connect 0V to Uno VIN and -5V to Uno GND pins?
My initial idea was to replace the PENTALPHA-BV30K with an Uno and mapping the pins accordingly. I couldn't find any datasheet for the BV30K, however I'm reverse engineering the control board anyway.
Control board findings:
- -11V is used to drive the A/B/C/D/E/F/G/DP segments of the LED display
- BV30K only uses 0V & -5V
I added an image of the transformer based power supply board so that I could check the supply there. The larger heatsink is for the 7905 IC and the smaller heatsink is for the BTA06 Triac.