O oeginc New Member Jul 24, 2010 #1 What is the right way of interfacing a 5vdc micro-controller to a 3.3vdc Xbee board? I can imagine 4 ways: 1) Output of the micro-controller going directly to the serial pin of the xbee 2) Output of the micro-controller going thru a voltage divider circuit to the Xbee (anyone have the resistance values off hand for this? 3) Output of the micro-controller going to a transistor to switch the 3.3v to the Xbee (would this be fast enough to not cause interference?) 4) Output ofthe micro-controller going thru a 3.3vdc power regulating chip to the xbee (I know, this sounds like a really bad idea to me too... I'm thinking either #3, or something I haven't thought of yet is probably the best idea, but I'm interested in hearing what you have to say...
What is the right way of interfacing a 5vdc micro-controller to a 3.3vdc Xbee board? I can imagine 4 ways: 1) Output of the micro-controller going directly to the serial pin of the xbee 2) Output of the micro-controller going thru a voltage divider circuit to the Xbee (anyone have the resistance values off hand for this? 3) Output of the micro-controller going to a transistor to switch the 3.3v to the Xbee (would this be fast enough to not cause interference?) 4) Output ofthe micro-controller going thru a 3.3vdc power regulating chip to the xbee (I know, this sounds like a really bad idea to me too... I'm thinking either #3, or something I haven't thought of yet is probably the best idea, but I'm interested in hearing what you have to say...
3v0 Coop Build Coordinator Forum Supporter Jul 24, 2010 #2 Check with sparkfun. They have a level translator board just for the XBee. Look at their schematics.