SparkFun Thermocouple Breakout - MAX31855K

SKU: SEN-13266

707.00 LE

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The SparkFun MAX31855K Thermocouple Breakout is a simple 14-bit resolution, SPI-compatible, serial interface thermocouple digitizer that makes reading a wide range of temperatures possible. A thermocouple works by taking two wires made of dissimilar metals, connecting them at the two ends, and making a temperature gradient between one end and the other (a \'hot\' end and a \'cold\' one). Once this is achieved, a voltage potential is formed and current flows. The SparkFun Thermocouple Breakout takes a standard Type-K thermocouple in one end, digitizes the temperature measured and sends that data out the other end via a SPI interface, thereby interpreting the data and translating it for you to read!

With the SparkFun Thermocouple Breakout, the thermocouple’s hot junction can be read from -200آ°C to +700آ°C with an accuracy of آ±2آ°C while the cold junction, inside the MAX31855K, can only range from -20آ°C to +85آ°C while maintaining آ±2آ°C accuracy. The MAX31855K constantly measures the temperature of the cold junction using an internal temperature-sensing diode. The MAX31855K requires a power source from +3.0V to +3.6V (+3.0V nominal) and only draws 1.5mA maximum.

The Thermocouple Breakout is designed to accept a standard [thermocouple connector](, for convenience and compatibility with probes you may already own. These connectors aren’t necessary, and you could solder a thermocouple directly into the through-holes labeled â€ک+’ and â€ک-’. If you decide to solder the thermocouple directly to the breakout board, it is recommended that the thermocouple be mounted for strain relief to avoid breaking the thin wires. Notches for a zip-tie or wire wrapping have been provided in the PCB opposite the header for this purpose.


* 14-bit Resolution
* SPI-Compatible, Serial Interface
* -200آ°C to +700آ°C Temperature Reading with آ±2آ°C Accuracy
* 3.0V to 3.6V (+3.0V nominal) Required
* Accepts Type-K Thermocouple


* [Schematic](
* [Eagle Files](
* [Hookup Guide](
* [Datasheet]( (MAX31855K)
* [GitHub]( (Design Files)
* [GitHub]( (Library & Example Code)


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