Posts: 1
Joined: Tue Feb 21, 2017 2:11 pm

MQ135 with digital output

Tue Feb 21, 2017 2:16 pm

In firts place i need calibrated the sensor MQ135 for CO2 GAS and then get the concentration of CO2 ppm.

Is there any tutorial?

Help me please


Posts: 2
Joined: Wed Aug 02, 2017 5:32 am

Re: MQ135 with digital output

Wed Aug 02, 2017 6:30 am

Hi, I am a new to sensors and Raspberry Pi.
I am trying to connect MQ135 to Raspberry Pi using ADS1015 to get gas concentration in the air.
Please do help me out in connections and code (in python) to get the values from MQ135 sensor on Pi.

Please help me.

Posts: 20
Joined: Tue Feb 21, 2017 5:09 pm

Re: MQ135 with digital output

Mon Aug 07, 2017 3:17 pm

MQ135 provided voltage output and raspberry pi doesn't have any ADC pins so you will need an Analog to digital converter in between raspberry pi and MQ135 sensor.
you can also use this MQ135 sensor board it has on board ADC and it will connect to raspberry pi through I2C and will provide and the digital interface between sensor and Pi.
https://shop.controleverything.com/coll ... gas-sensor

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