Cold Brew – Custom Board design:
Notes (things done:
striked through): Delete the additional USB connector … No way I’m going to be able to SMT solder Connect fan directly to 5V input … no need to stop fan … It runs quiet Delete the diode that is attached to the fan Need to use Analog (ADC1) inputs. Not ADC2 … something about wifi & ADC2 incompatible Use ADC pins 36,37,38,39 only (low noise) for analog reading Don’t use Serial Pins (RX & TX, GPIO1 & GPIO3) Re-wire the H-bridge … The Enable should be set to same voltage as data (3.3V, not 5v) Use all 6 logic inputs for more flexibility (1A, 2A, 3A, 4A, 1-2EN, 3-4EN)
- Test this!
- make fan feet shorter (so it compresses fan on heat sink 0.08in shorter)
- Make feet a little fatter (so they don’t crack when torqued)
reorganize board so inputs are easier to play with push board a tad more in so that drops are more lined up with light sensors (0.087in closer)
- Program PWM thermal close loop