MAX31855EVKIT#-ND (Manufacturer - MAX31855EVKIT#) Arduino Thermocouple Shield - McLEng. From McLEng Version 2.1 Single Channel The thermocouple shield was based upon the original breakout board developed for the MAX6675, See Single Thermocouple Interface for more details. While this is a great little chip it is a small surface mount part and therefore difficult to solder. The thermocouple shield not only helps with having the MAX6675 chip broken out to a simple 0.1" header, a direct interface the the shield, and also provides a PCB Thermocouple Connector to easily interface to a thermocouple. Purchase from the Store Tutorial It is simple to get everything up and running. Install a set of shield headers or shield stacking headers to the board (Optional) Cut solder jumpers if you need to connect the MAX31855 to different pins.
Version 2.1 (current) Initial release of a dedicated single channel board. Board Specs Dimensions: Arduino Shield Chip: MAX31855, TXB0104 Voltage: 5V, 3.3V Header: 2 - 1x6 0.1" Pitch, 2 - 1x8 0.1" Pitch Fixturing: Matching holes to Arduino Eagle Files. MAX31855 Arduino Library - McLEng. MAX31855 Thermocouple to Digital Converter PTM by Digi-Key and Maxim. MAX6675 - McLEng. From McLEng MAX6675 Chip The MAX6675 performs cold-junction compensation and digitizes the signal from a type-K thermocouple.
The data is output in a 12-bit resolution, SPI™-compatible, read-only format. This converter resolves temperatures to 0.25°C, allows readings as high as +1024°C, and exhibits thermocouple accuracy of 2˚C for temperatures ranging from 0°C to +700°C. The MAX6675 is available in a small, 8-pin SO package. Datasheet The datasheet for the MAX6675 can be found here File:MAX6675.pdf. Interfacing The MAX6675 Arduino Library can be used to interface to the MAX6675 chip from an Arduino, other microcontrollers can be connected using the SPI interface as outlined in the File:MAX6675.pdf. ++ Modern thermocouples and high resolution delta-sigma ADC.
Thermal Management Handbook. MAX31855EVKIT.pdf (application/pdf-object) MAX31855EVKIT Evaluation Kit for the MAX31855. New thermocouple interface: MAX31855. I got around to breadboarding a K type MAX31855 circuit today. With the probe stuck under my tongue, I measured 93.65 degrees F. The data sheet says they do a linear fit to the actual curve so I don't know if that is an acceptable error or not. Edit: I tried it in boiling water and got around 205 degrees F. That's about a 3.3% error. Typical one doesn't select thermocouples for their accuracy, but rather for the high temperature range and relative lower cost compaired other temperature sensors types. Process control industry typically use RTD PT100 sensors where accuracy is important and TCs where high temp service is required like furnaces and other high temp process equipment. The error for a standard grade K-type thermocouple is ±2.2 °C or ±0.75% of the measurement temperature.‡ Because ±0.75% of 200 °C (±1.5 °C) is less than ±2.2 °C, the error of a standard grade K-type thermocouple is ±2.2 °C.
Type J probes. Cold-junction compensated thermocouple-to-digital converter. Thermocouple Introduction and Theory.