I build a system which include the sensor ZSE30A-01-C and the sensor XGZP6847A on the pipe and i use the 1stage vacuum pump for creating the negative pressure between 0 to -100 kPa. I need some helps on the code for showing the measurement of the vacuum pump and the actual value that show on the sensor ZSE30A-01-C though the sensor XGZP6847A and ESP-32-WROOM.
If the XGZP6847A sensor is analog, then you will also need an external ADC, for example, ADS1115
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yeah, i think should buy one for further things.
Do you have the 5V, 3.3V, or 3.0V version?
Do you have the G, GN or GPN version?
i have the 5V version and the name of the ESP is ESP32 NodeMCU LuaNode32 which have 38 legs.
Do you realize that the output voltage can be as high 4.5V and that can damage the ESP32 input pin?
All ESP32 I/O are 3.3V and you should never apply any voltage higher than that to any pin, otherwise you may damage the pin or possibly the entire board.
oh I see the problem here ! Thank for your help !
Voltage isn't the only problem.The combined accuracy of the XGZP6847A and ESP ADC are probably not good enough to use for calibrations. I would invest in a good quality vacuum gauge in order to do calibrations.
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I understand that using XGZP with ESP is not qualified for calibration but with my current financial ability it is very difficult to get high precision sensors in industry !
Well, between the XGZP and the ESP the overall error could be as high as +/-3% provided you calibrate the ESP ADC and you use a precision op-amp circuit to scale the sensor output.
If you use an external ADC as @ua6em suggested you are just basically left with the XGZP error.
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That might be a better way! Thanks for your advice.
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