hydra/ph-probe
18-bit pH and temperature logger with a proper guard ring, USB-C, and a two-year coin-cell sleep current of 4µA.
Build log14 reports
- nilsv1.0.01 months ago64.144h 40m
USB enumeration failed until I added the 5.1k CC resistors. Check the errata.
- swapped LDO for AP2112K
- 3D-printed lid in PETG
- kenjiv1.0.02 months ago42.026h 39m
Worked first try. Reflowed with a hot plate at 190°C.
- tomasv1.0.02 months ago43.664h 55m
Printed the enclosure in PETG at 0.2mm, fits with no sanding.
- luciav1.0.02 months ago45.084h 47m
Substituted a cheaper mic; SNR is noticeably worse but usable.
- wesv1.0.03 months ago43.103h 36m
Printed the enclosure in PETG at 0.2mm, fits with no sanding.
- ilyav1.0.03 months ago53.492h 42m
Boot loop until I flashed with the 2.1 partition table. Docs could say this louder.
- nilsv1.0.04 months ago64.495h 16m
Running for three weeks continuously, no issues.
- ilyav1.0.04 months ago57.585h 11m
One cold joint on the ground pad — needed flux and a bigger tip.
- ilyav1.0.04 months ago47.762h 35m
Boot loop until I flashed with the 2.1 partition table. Docs could say this louder.
- hexbytev1.4.04 months ago51.832h 53m
Second build. Took half the time now that I know the order of assembly.
- amarav1.0.05 months ago50.733h 40m
Running for three weeks continuously, no issues.
- swapped LDO for AP2112K
- 3D-printed lid in PETG
- sam-kv1.0.05 months ago56.755h 48m
Running for three weeks continuously, no issues.
- priyav1.4.05 months ago44.455h 30m
Worked first try. Reflowed with a hot plate at 190°C.
- priyav1.0.05 months ago48.556h 31m
Worked first try. Reflowed with a hot plate at 190°C.