Hello,
So i'm working on a digital dashboard and everything is working very nicely and now its time to knock out the tach and wheelspeed sensors part. For this i will use my PIC18F4480's pulse capture mode.
The signals from the car are 12V in amplitude. I can't find a maximum input voltage spec on this chip, but i assume thats on the high side. Should i use a voltage divider to knock em down to 5Vish? or should i use an opamp which might also help as a buffer. Are there any input impedence issues or anything else i might need to consider?
Thanks
So i'm working on a digital dashboard and everything is working very nicely and now its time to knock out the tach and wheelspeed sensors part. For this i will use my PIC18F4480's pulse capture mode.
The signals from the car are 12V in amplitude. I can't find a maximum input voltage spec on this chip, but i assume thats on the high side. Should i use a voltage divider to knock em down to 5Vish? or should i use an opamp which might also help as a buffer. Are there any input impedence issues or anything else i might need to consider?
Thanks