Hi everyone, I just bought a MR513 gas sensor to make an arduino-based breathalyzer. My goal is to build a more precise system than MQ-3 sensor based ones and then to create a tutorial. The only problem is that I don't have any idea about how to wire and power the sensor and the datasheet is quite vague.
According to it the sensor has to be powered by a 3.0V (+/- 0.1V) and a 100mA (+/-10mA) current. If I'm right the arduino can only provide 3.3V and 50mA (or 5V).
So, do I have to make an external power supply for the sensor (and then how?) or can I use 2 or 3 PWM outputs in parallel to make a 3.0V output (after smoothing with a low-pass filter) with 3*40=120mA maximum?
Do you have any idea about how to handle this?