JMLB 24 Posted September 23, 2010 Share Posted September 23, 2010 I am trying to interface the launch pad with a device that works on 5V It is my understanding that the launch pad works on 3V. My volt meter is dead so i couldn't confirm this. this was just by reading the data sheets. so my idea for interfacing the launch pad with this device was for the output of the LP to the Device I would use a NPN transistor. I would have the base connected to the out put pin of the LP, the collector connected to a 100? and the Input of the device and the resistor would be connected to 5V VCC and the Emitter to the ground. I am aware that this will invert my logic but that is easy to deal with in code. Ill try to Illustrate with ASCII. LP out | 100? __|__ 5V VCC ---\/\/\--|---/ \-------| | __|__ | --- | 5V Data Input for the reverse, Input to the LP from the 5V device I would use a voltage divider. I would take the output of the 5V device connect it to a 100? resistor then connect it to the input of the LP and a 200? resistor and connect that to the ground ill try to illustrate with ascii again 5V Data ----------- | 100? Z |--------- Launch pad input 200? Z | ----- --- - I might have to get bigger resistors depending on the max input current, but I think the ratio would be good. I am much more of a software guy than a hardware guy. So I am just trying to get feed back on how you think this would work or if you have any suggestions or improvements. I am not looking to order any parts though. Quote Link to post Share on other sites
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