- Tue Aug 16, 2016 2:55 am
#53043
I connected a wemos d1 to a Mq131 5V module (like this one http://www.sainsmart.com/sainsmart-mq13 ... ry-pi.html)
The esp8266 is running a simple routine to adc.read the value every 5 minutes, amd to push it to a google apreadsheet that creates a real time chart (see attached).
My problem is to translate the voltage reading (I know that wemos adds a resistor to put the readings on a 0 to 3.3 V scale) into a ppm estimate. Did anybody use this sensor and know how to turn the reading into a valid ppm estimate?)
The esp8266 is running a simple routine to adc.read the value every 5 minutes, amd to push it to a google apreadsheet that creates a real time chart (see attached).
My problem is to translate the voltage reading (I know that wemos adds a resistor to put the readings on a 0 to 3.3 V scale) into a ppm estimate. Did anybody use this sensor and know how to turn the reading into a valid ppm estimate?)
