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Sensors convert a physical quantity (e.g. temperature, pressure) into an electrical signal.

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I2C temp sensor and an Arduino wifi shield not working together

I had the same problem with the wifi shield and an ML8511 UV sensor (inconsistent readings) and I noticed that where it was supposed to be 3.3V I was getting 4.85V after jump wiring the IoRef to the 3.3V …
Jorge Fantin's user avatar