Tweet

Replying to @josecastillo

Pulsometer watch face! A modern smartwatch will shine lights into your arm and measure this for you. (It’ll also need to be recharged in 12 hours.) Sensor Watch does it 18th century style: by asking you to count 30 heartbeats and calculating it on a scale. https://github.com/joeycastillo/Sensor-Watch-Documentation/commit/841558eda9297b1d43ab9c541464e0915564295f

(original)