The most interesting open source example of this I can think of is Ben Krasnow's (and friends') temperature reporting magnetic stir bar: https://www.youtube.co

The most interesting open source example of this I can think of is Ben Krasnow's (and friends') temperature reporting magnetic stir bar: https://www.youtube.com/watch?v=nh1SIfipQs4 https://www.youtube.com/watch?v=nh1SIfipQs4 The temp sensor and transceiver PCB are cast into urethane and the coil gets installed into the hotplate. In theory lets you do all kinds of interesting stuff like monitoring when you can't get a wired probe into the vessel, or to drive a control loop that actually monitors the liquid and not the plate temperature.