So I was building an alcohol detection system which renders the vehicle immobile when a certain threshold is reached. It works for DC motor. The system uses atmega32a and MQ-135. The problem is that I don't know what steps should I take to render the vehicle immobile. I searched on google and stumbled upon ECU but I felt that ECU is suitable for large applications (I found a guy whose ECU does wide variety of jobs). So please suggest me a direction to work upon.
Apologies if I have posted my issue at wrong place.
Thank you so much!!