Editing Online Thermometer
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==== 2nd Step: Connect Arduino and 'imp' through a voltage converter ==== | ==== 2nd Step: Connect Arduino and 'imp' through a voltage converter ==== | ||
− | + | 'imp' works at 3.3V while Arduino works at 5V. You cannot connect their PINs directly because you could burn the 'imp' with the higher voltage generated by Arduino. The solution is to connect them through an intermediate voltage converter. This project has chosen a Sparkfun converter [https://www.sparkfun.com/products/11978] but any other similar converter could be used. There is a tutorial on Sparkfun website that explains how this component works. It also includes an example showing how to wire a serial connection between Arduino and electricImp [https://learn.sparkfun.com/tutorials/using-the-logic-level-converter/hookup-examples "Using the LLC for Serial" paragraph]. Make connections as shown in the [https://dlnmh9ip6v2uc.cloudfront.net/assets/b/1/c/8/e/52275e89757b7fcd1b8b4567.png picture] but keep in mind that our Arduino uses pins 7 and 8 for the serial connection. Wires coming out of 0/RX0 (green) and 1/TX0 (yellow) should come out of PINs 7 and 8. | |
'''Important:''' Arduino serial connection uses pins 7 and 8 (not pins 0 and 1) | '''Important:''' Arduino serial connection uses pins 7 and 8 (not pins 0 and 1) |