As the topic shown above, my car's tachometer was not working anymore and, well, i'm the one that have been doing stuffs with AVR for a couple years. My last project was PID for mini CNC machine.
I got an idea to make a project to measure the engine RPM using AVR microcontroller after my car's tachometer was broken. Indeed, my car is 20+ years old. :wink:
First of all, I need to know that what AVR model would suit my requirements. I have to measure the ignition pulse from ignition coil's sensor and, actually, it was about 5000 to 6000 rpm, before broken. Then I think the microntroller should work at somewhat high frequency enought to capture it all.
Second, small is important. And right now I don't know yet that what is the voltage level of the ignition pulse and current, which was pushed thru the original sensor's line when the coil were ignited.
Third, low power consumption. I do not want my project to waste my batteries :?
If any of you have suggestion about my project, please tell me.