This board is intended to be used to connect laboratory thermocouples to the Internet for purposing of monitoring it remotely. This came out of a need from a materials science lab in Chicago to ensure their furnaces kept running, even through power outages. With this device, they no longer have to physically go to the lab to check the status of their experiments.
The design is based around the Particle Photon WiFi board. Instructions for setting up the Photon to send data to a SparkFun data stream are available here. The example publishes all four channels' hot junction temperature plus the cold junction temperature approximately every five minutes.
The firmware library currents support all major types of thermocouples, including B, E, J, K, N, R, S, and T. Support for each thermocouple type is accomplished via lookup tables derived from NIST data.
The board uses the ADS1118 ADC with custom firmware. Essentially it is an implementation of TI's App Note SBAA189. The board design and firmware libraries are all open source. Here are links to the PCB, ADC library, and thermocouple library GitHub repos. Pull requests are welcome.
Each purchase includes a Particle Photon plugged in and ready to go. Also note that soldermask and silkscreen color may vary from what is pictured.
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