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Hi,
Do not use a breadboard, you will have all sorts of problems, particularly around the crystal components.
To program the 2550, you have to get someone else to to it for you, or build one of the many simple and cheap serial or parallel programmers as found all over this forum.
Its easy...
car battery voltage drops when cranking
Hi,
The 1N4007 or any similar 1amp + diode will be fine.
Although not familiar with that timer relay many of the cars relays stay on all the time you are running so cannot see why you can not do the same with the timer, although its alway wise to fit an...
relay that opens after a certain voltage drop
Hi,
Best way to prove it is by making a temporary wire to the battery terminal, perhaps the aux devices are switched off when the ign key is in the starter position ?
hameeds01 diagram does show 10,000uf so it might just be a case of a much bigger...
pic18f4550 interrupts
Hi,
Will not try to work out your code - it looks like you are using the Interrupts like I used to which similarly gave me wild results.
Help from the Microchip forums put me on the right track - a typical layout attached.
The important points they made:-
The ISR...
relay only engages over certain voltage
hi,
Still the same person, couldn't log into wp100 for some reason.
Afraid I missed your earlier mention of using a timer relay - so yes it will act as you correctly say.
The only thing is that the capactitor/s will charge up in an instant - so if the...
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