I'm just catching up with the thread again. Interesting you say about the DS1307 for accuracy. Does this mean without it, my clock wont keep good time? What sort of drift are we talking about?

I'm limited with the footprint space available. But I do see your point. I guess i could gauge it better if i could see how big this add on is, and then incorporate it into my design if I think it'll fit in the space i have. (to make use of the existing lens etc).

So what sort of PIC would be recommended to use? I've been looking around casually, and see that the 16F84a seems to be quite popular. Are they all in and around the same to program?

http://ww1.microchip.com/downloads/en/DeviceDoc/35007b.pdf

https://datasheets.maximintegrated.com/en/ds/DS1307.pdf


...On the topic of swapping cars. Nah! lol!

They all program the same way. The picF84a is ancient - pick on that is not obsolete (still in production)

 

oh. didn't realise this one was obsolete. Any good suggestions as a replacement?


I see a lot of PICs use a 5V feed to supply them, and for I/O. As my intention is to use one on a vehicle, where the supply and I/O will be between 10V and around 14V, is there a PIC which can handle this, or am I immediately looking at having to step the voltage down and regulate it?

I've made a couple of projects for the car so far, and on one of them, i had good success with a 7809 regulator for a couple of inputs, and 9V zener diodes for others. Am I looking at having to do something similar again? (All takes up space on my footprint space available.)

 

oh. didn't realise this one was obsolete. Any good suggestions as a replacement?


I see a lot of PICs use a 5V feed to supply them, and for I/O. As my intention is to use one on a vehicle, where the supply and I/O will be between 10V and around 14V, is there a PIC which can handle this, or am I immediately looking at having to step the voltage down and regulate it?

I've made a couple of projects for the car so far, and on one of them, i had good success with a 7809 regulator for a couple of inputs, and 9V zener diodes for others. Am I looking at having to do something similar again? (All takes up space on my footprint space available.)

Microcontrollers RF in 3.3 to 5V, some less. None more that I know of. An arduino has an onboard regulator to allow 12V in but there is a regulator on board to step every thing down - the I/o pins are not 12v.