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Heater control #12

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rwb27 opened this issue Nov 28, 2017 · 1 comment
Open

Heater control #12

rwb27 opened this issue Nov 28, 2017 · 1 comment
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enhancement pcb design

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@rwb27
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rwb27 commented Nov 28, 2017 •
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It would be great to have 1-2 channels of heater control. This probably wants some sort of digipot/pwm + MOSFET combination. It needn't be fast, so sticking it on the i2c bus seems very sensible. The mosfet probably needs to be beefy enough to handle a reasonable heater. If this gets expensive, we could always keep it through-hole and solder them in as needed.

This isn't needed for the malaria microscope, but would be useful for the version with the incubator for water testing.
@rwb27
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rwb27 commented Jul 5, 2018

To add a thought: a digipot is probably a nice thing to use for analogue control of the heater (via a MOSFET, of course), and (given that we will likely want one for the LED) might save an IO pin or two as well.

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