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Daox · 03-19-2011, 07:52 PM

Thanks!

First, I forgot to mention, but the arduino output is 0-5V.

Second, the coil resistance of the relay is ~81 ohms, so we're looking at it drawing ~175mA.

Also, it looks like the relay I'm actually using has a built in diode in it which should simplify things a little. Here is the data sheet: 20A relay

03-19-2011, 07:52 PM	#39 (permalink)
Daox Administrator Join Date: Dec 2007 Location: Germantown, WI Posts: 11,203 CM400E - '81 Honda CM400E 90 day: 51.49 mpg (US) Daox's Grey Prius - '04 Toyota Prius Team Toyota 90 day: 49.53 mpg (US) Daox's Insight - '00 Honda Insight 90 day: 64.33 mpg (US) Swarthy - '14 Mitsubishi Mirage DE Mitsubishi 90 day: 56.69 mpg (US) Daox's Volt - '13 Chevrolet Volt Thanks: 2,501 Thanked 2,586 Times in 1,554 Posts	Thanks! First, I forgot to mention, but the arduino output is 0-5V. Second, the coil resistance of the relay is ~81 ohms, so we're looking at it drawing ~175mA. Also, it looks like the relay I'm actually using has a built in diode in it which should simplify things a little. Here is the data sheet: 20A relay __________________ Current project: A better alternator delete