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EnviroDIY / EnviroDIY_Mayfly_Logger

hardware design files, example code sketches, and documentation for Arduino-framework EnviroDIY Mayfly data logger
https://envirodiy.org/mayfly/
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+12V generation - NCP1403 opt #2

Closed neilh10 closed 6 years ago

neilh10 commented 8 years ago

wrt Mayfly 0.3: If a turn of hardware is done, I wonder would it be possible to conside a layout where by the NCP1403 could be added - possibly as a user option in desoldering the NCP1402 +5V generation. It seems like the NCP1403 could facilitate generation of +12V with a reliable current of 20mA, even when the input voltage has dropped to 3.0V, The cost would be laying out the board with three optional components 2 resistors, 1cap (RFB1 RFB2 Cc in cct below). Possibly boosting the outcap rated voltage to +15V. This components would require one bypass strap to facilitate the current NCP1402-50T1 +5V

image

This could support the large number of +12V sensors, both analog 4-20mA and also with the addition of a RS485 interface the modbus sensors.

s-hicks2 commented 7 years ago

We thought about incorporating a 12v boost option, but since very few end users would actually need it, we decided to leave it off. We figured it would be easier to generate other voltage on a separate shield or breakout board since it would also require other circuitry like level shifting for the logic and whatever other requirements their signals would need. But perhaps there's a way to make the layout more modifiable on the next version for people who want to swap out the boost regulator or add an additional one.

neilh10 commented 6 years ago

Wingboard generates +12V

aufdenkampe commented 5 years ago

For reference, neilh10 is referring to the Modbus-Mafly-WingShield, which can also easily boost to 9V or 12V.