Range finders with 3.3V Teensy 3.0

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ChrisOdom

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In my classroom I'm thinking about switching from a 5V system (Teensy2 and Arduino Uno) to the Teensy3's 3.3V system. Most components migrate over fairly well, but the Sharp IR range finders (GP2D12, 2YOA21, and 2YOA02) have a greatly reduced range and a loss of precision. Is there any way to make these sensors work at 3.3V? (I have amassed a drawer full of them over the years.)

I know sonar modules work on 3.3V (at least my Maxbotix EZ1 does) but they are expensive and I don't have drawers full of them. Are there other options? Is there a move to make 3.3V IR rangers?

Thanks for the help.
 
For devices that output a strong 5V signal, where the signal has only modest bandwidth (under 100 kHz) the simplest solution is a series resistor. A value like 10K is a good place to start.
 
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