MR513 alcohol sensor wiring and powering

Using Arduino Sensors
1

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?

2

I'm having trouble seeing any of the specs on that PDF. You can get programmable voltage regulator chips that are set to a voltage of your choice using a couple of resistors - this would be one way to get 3.0V

3

that's also where I finally get, i will probably buy a LM317 put a 9V battery on in and output a 3.0V, I also found the two 2K resistors and the 500 ohms potentiometer for the detecting circuit.

4

Any luck with this? I haven't been too successful with getting accurate readings on an MQ-3... Interested to hear how this turned out for you

5

anyone here have anyluck with this?