Arduino and Quectel BC66 ADC

Hello everyone,
I'm currently programming the BC66 with Arduino and can't read the ADC. No matter what I set, I get the value 5, the applied voltage is 400mV. I measure that with the multimeter on the ADC. Can someone help me please

Interesting problem but not enough information to help. Please post a link to "Technical" information on the BC66, there is more than one variety. Links to sales locations such as azon are normally useless. Also post a schematic, not a frizzy picture as to how you have wired it including all power, ground and power supply connections. What Arduino you are using.

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