@Felix22 @hacxx it will support in the future!

Hello @Felix22 no, sorry, I don't have such a list. But if the error code is from an AT command you should be able to find its meaning from the AT command document linked on the product page. Thanks Felix

what's the voltage when the sun comes out? you would be better of using a VMeter unit instead of the adc to measure voltage as under high sun it could be overloading the 3,3v max input pin causing the reset. https://shop.m5stack.com/collections/m5-sensor/products/voltmeter-unit-ads1115 [image: 1_f984ea27-d5fd-4a7b-89f6-9d62de461d86_1200x1200.jpg?v=1600647920]

Hello @Felix22 I do not have a 4-Relay unit so I cannot test myself. But it sound like the new one might be defect? Thanks Felix

@plusulli Works well on Arduino IDE !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!