Raspberry Pi loses power when connecting the GND of the CO2 sensor.

I'm a beginner at Raspberry.
The CO2 sensor MH-Z19 and Razpie 3 model B are trying to be male-mixed.
However, if you connect the 6th GND of the Raspie GPIO to the sensor side GND (number 7), the Raspie will be turned off.
If the jumper wire is connected to the GPIO on the raspy side and not to the sensor, the power will not be turned off.
What are the possible causes and countermeasures?

raspberry-pi gpio sensor

2022-09-29 22:03

2 Answers

Do you mean that the power will go down just by connecting only the GND without connecting the power source or signal?

If so, there is no problem with the MH-Z19, and I think the part of the raspie that I think is GND is not GND.
Power is off because
①Power supply capacity exceeded or
②The raspy reset terminal is ON or
③I think the only way to do this is to turn off the power supply.

First of all, to find out if the terminal you think is GPIO6 is really GND,
Try measuring the resistance value with the GND terminal with the tester.
If you have already checked,
Raspies have multiple GND terminals, so do other terminals experience similar symptoms?
Please check it.

2022-09-29 22:03

I think the GND and Vin of MH-Z19 were adjacent to each other, but is there any possibility that this is shorted due to solder defect in the pin? Please check it out.

2022-09-29 22:03

If you have any answers or tips

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