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How to read a chain of TMP421 Temperature Sensors with an Arduino

2011 April 7

I recently made some minor modifications to the Liquidware Arduino Temperature Sensor Library which is designed to read from a single TMP421 sensor from Modern Device (the chip is made by TI).  You can download my modified library, LibTemperature2.

Instantiate a LibTemperature2 object with the address of the sensor, which is determined by the A0 and A1 pins on the breakout board according to this chart:

‘0’ means Ground, ‘1’ means Vcc, and ‘Float’ means unconnected.  So to address 0x1C (0011100b), connect A0 to ground and leave A1 unconnected.  Note that the default address is 0x2A.

Enjoy!

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