Well, the thing that is missing is that in this way the "high" level is 3.4V. If your 5V I2C device does register 3.4V as "high" reliably, then this solution will work (however you will leak 5V/(2k2Ohm +4k7Ohm) = 0.72 mA, which is not much in itself, may be an issue if you are running from battery - you could cut the connection to +5V and simply connect +3.3V from Netduino, which does not produce this excess current). If it does not, your best bet is a logic level converter like http://www.sparkfun....nverter-v10.pdf (which is basically just a MOSFET with pullups on both sides - 5V on the module side, 3.3V on the netduino side).
Analog Input Quirk
Started by J Wilson, Oct 11 2011 02:49 PM
20 replies to this topic
#21
Stefan W.
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Posted 10 April 2012 - 11:54 AM
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