Hi guys, I have a school project which requires me to mimic an optical gas sensor system using a microcontroller as the control system for the gases and the lasers.
I will be replacing the lasers with LED and it will be required to switch on and off by the mircocontroller for specific periods of time. I need a three way value which will also be controlled by the microcontroller, in order to select two different types of gas, one gas is the gas to be detected and the second gas is to purge away the detection gas. Finally, using a photodiode to detect a voltage from the LED and send back to computer using the mircocontroller,
I know roughly how to design the circuit but I have some questions and hopefully you help me out. I included a rough sketch of the project below.
My questions:
1) Is it possible for me to DIY a 3 ways valve and be controlled by the mircocontroller?
2) If I'm not wrong, I believe the distance between the LED and photodiode cannot be too far away? maybe a maximum 1cm gap? is this correct?
3) if you guys have any circuit schematics which are useful to my project, please share with me! I appreciate your help!
I will be replacing the lasers with LED and it will be required to switch on and off by the mircocontroller for specific periods of time. I need a three way value which will also be controlled by the microcontroller, in order to select two different types of gas, one gas is the gas to be detected and the second gas is to purge away the detection gas. Finally, using a photodiode to detect a voltage from the LED and send back to computer using the mircocontroller,
I know roughly how to design the circuit but I have some questions and hopefully you help me out. I included a rough sketch of the project below.
My questions:
1) Is it possible for me to DIY a 3 ways valve and be controlled by the mircocontroller?
2) If I'm not wrong, I believe the distance between the LED and photodiode cannot be too far away? maybe a maximum 1cm gap? is this correct?
3) if you guys have any circuit schematics which are useful to my project, please share with me! I appreciate your help!
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