Hello, I bought a analog UV sensor and at first, it worked but now if I upload the code for reading analog data, and connect the sensor I get mirrored ???????... on my serial monitor. Anyone knows what this means? (I connected vcc on 5 volt, gnd on gnd and out in analog 0)

What if you get ? on serial monitor

JohnRob October 4, 2021, 9:59pm 5

Try covering the sensor with a thick book. Or go outside.

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