A project log for Heartbeat Logger

A portable device that logs a snippet of your heart at the push of a button.

Ole Andreas UtstumoOle Andreas Utstumo 10/25/2019 at 13:470 Comments

Did a crude test on current consumption during runtime. During runtime, the MAX ECG circuit is the only thing running constantly, waking the MCU up from Stop mode every 32 samples so it can receive these via SPI and store them in the RAM buffer.

180 ish uA on average. On a 240 mAh coin cell battery that should provide well over a week of runtime. All components are selected to operate below the "knee" of the battery discharge profile.