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an LED glued to the face of an LDR converts voltage to resistance, but a digital pot would be simpler to calibrate. I'm using a MCP41010 with the 334, which works very well and cost me ~1ドルusdandavis– dandavis2017年03月05日 12:50:24 +00:00Commented Mar 5, 2017 at 12:50
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an LM317 can provide 0-2ma CC with common 1/4watt resistors, look at the datasheet.dandavis– dandavis2017年03月05日 13:48:41 +00:00Commented Mar 5, 2017 at 13:48
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On Arduino, PWM stands for Pulse Width Modulation, not "Phase Width Modulation"James Waldby - jwpat7– James Waldby - jwpat72017年03月05日 21:47:33 +00:00Commented Mar 5, 2017 at 21:47