Hi

I have an idea, which includes a microcontroller, three LEDS(green, yellow, red) that indicates the level of oxygen in the area, and ofcourse a Oxygen sensor.

I'm probably going to use a MSP430 microcontroller or a STM32 Nucleo board.
As for the sensor, im not quite sure on it yet, at that is why im posting this thread.

So i am open for ideas for which oxygen sensor I can use, and it would be really helpful if you could explain how the given sensor works.
I have experience in using analog sensor and ADC on the microcontroller.
As for the microcontroller, if you think that there is a better fit out there, you're welcome to share your thoughts.

Best Regards
Poul M. H. Poulsen

 

It depends on the range of oxygen concentration you wish to measure. I assume that you are measuring oxygen in air. Hence a sensor that measures 0-25% O2 is probably what you are looking for.

Here are some examples:

http://www.robotshop.com/en/grove-o-gas-sensor.html

http://euro-gasman.com/oxygen-o2-city-technology-gas-sensors.html

Any microcontroller with built-in ADC will be fine, such as MSP430G2553.