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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 02/02/2017 at 11:224 Comments

It wouldn't be a successful migration to a new PCB tool without introducing a new hardware bug, would there? ;) That's why pad[1] of the SERCOM module is connected to RX of the BT module. However, pad[1] cannot be configured as SERCOM TX, only pad[0] and pad[2]. To solve that we could

a) configure the pin connected to the RX of the bluetooth module as an input (high impedance), configure one of the unused pad[0] pins as the SERCOM TX and run a wire between them.

b) emulated UART in the firmware like the SoftwareSerial library of Arduino. Since we're only sending data, this could work out all right.

Going for a would be the quickest solution. However, I'll give b a try, keep the PCB clean and learn something new.

Discussions

helge wrote 02/05/2017 at 14:18 point

I've opted not to buy the ECG amplifier to stay excited about your progress :)

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Ole Andreas Utstumo wrote 02/05/2017 at 16:20 point

That's really cool of you! I'll make sure to keep you updated ;)

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oshpark wrote 02/03/2017 at 01:31 point

Looks good!

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Ole Andreas Utstumo wrote 02/03/2017 at 16:04 point

Thanks ;)

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