I will give the task of making a breathalyzer Car consisting of Arduino Mega and its respective sensor MQ-3 for blowing and detect alcohol, if a lot of alcohol is detected, it will send a signal to the relay so that it can not be start your car while a message to the cell of close to drunk people, this shield with SIM900 GSM is sent; if no alcohol is detected, the vehicle function properly.
I'm thinking of implementing a GPS module to send the coordinates in the message Could do the latter?
Well, my question is how do I feed all this in the car?, what do you recommend?, What you would use? or what have you used?
Any other advice for the project is more than welcome. Thanks in advance.