[what happened] Periodic signal at 2min / cycle in od reading

[CamDavidsonPilon]

If the OD signal looks like this, then likely the LED driver output is saturated and we are basically seeing the 5V rail noise. You can test this by running a CPU intense command (like pio update --app --dev) and seeing the OD drop (pictured above).

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Solution is to drop the ir_intensity in the config. In the above graph, the IR intensity was 95%, and I was using v0.1 HAT. After setting the ir_intensity to 45%, this was the result:

Nice.

[CamDavidsonPilon]

This should be fixed in the production HAT however