Pioreactor / Pioreactor/pioreactor
[what happened] Periodic signal at 2min / cycle in od reading
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- Dominant language
- Python
- Stars
- 149
- Forks
- 18
- PR merge metrics
- No merged PRs in 30d
Description
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).
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.
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First steps
- Read the whole issue, then the project's contributing guide.
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- Open a pull request that references the issue number.
Research direction
Start with the ir_intensity configuration and reproduce the periodic OD signal using the CPU-intensive pio update --app --dev command described in the report. Compare the signal at the reported intensity levels; done means the saturation behavior and the appropriate configuration guidance or change are confirmed.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- raspberry-pi
- Domain
- embedded-iot
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 30/100