Soe-402 Hot!

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I wired this up to log temperature and humidity in a paint booth. For the first 48 hours, the data was flawless—clean curves, no dropouts. Occasionally, stale browser cookies can cause a false

Then, on day three, I hit the snag. The unit started spitting out 0xFF values every 30 seconds. The SOE-402 is very sensitive to power ripple. If you are using a cheap USB power supply, add a 100µF capacitor across the VCC and GND pins. This instantly solved the issue. This isn't a design flaw; it is just a sign that the sensor is accurate enough to detect bad power. For the first 48 hours, the data was