This version adds the ability to enter custom max heart rate values right on the CLUE board itself, using the buttons and cap sense touch pads. Plus, the on-board speaker is used to sound the alarm when you exceed 90% of your max.

Here’s a fresh update to the CircuitPython BLE Heart Rate Training Zone guide — now, we’ve got a CLUE version ! This added page gives you all you need to to code up the CLUE to receive BLE heart rate monitor info, including your BPM and Target heart rate percentage.



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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

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CircuitPython – The easiest way to program microcontrollers – CircuitPython.org