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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@HughB
I don't think a simple 2 line display that was updated on sending a record would be too heavy on the Cpu
HRM 66
COUNT 255
The count does have to be an exact record count but just something that shows the recording is progressing and data is being sent. Printing HRM value allows observations to be made about the recording to be made while running etc. Eg I know my heart was 145 but it showed 89 etc.