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Noisy 3.3v (is it a clone?) #45
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Please check whether there is WeAct Studio V3.1 on the back of the board. |
We have a very varied selection of v3.1, v3.0 some with WeAct, some with WeAct Studio, some without and some blank! Many combinations! I created a simple test code to measure the internal avref over 10 seconds and print the standard deviation. All of the 3.1's with the official logo were the most stable. (<20mV) Think we must just have a lot of fakes. We want to buy a batch of official devices but the link to official shop in the README is broken see #42 would be good to get that fixed? |
The v3.0 you bought is fake. Now the boards we sell are all v3.1. This is a AliExpress link weactstudio.aliexpress.com |
We are prototyping a big project using these and have probably used nearly 100 so far from different suppliers. We find some are having inaccurate ADC reading. We have traced this down to what we suspect is a noisy 3.3v supply. See below for some oscilloscope shots of the 3.3v rail on a good, ok and bad board respectively. All tests powered from the same stable 5v USB.
Good (Stable ADC readings)
OK (Slight errors in ADC)
Bad (Wildly off ADC)
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