Multichannel Gassensor V2 , CO-Channel does not respond


I have problem to read all 4 channels of Grove Multichannel Gassensor.

Only 3 of 4 sensors do respond. In Arduino serial plot screen two channels always have the same value (of VOC). While CO-sensor does not appear.

I checked analog voltage output of all 4 sensors, they are correct. So I guess its firmware problem of on-board CPU.

How can I update on-board firmware?



now I found the problem!

Is bug in example “demo_background_gas_name” (select by GAS)

Is ok with “demo_background” (select by DEVICE)

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