Car has 12V rail and 12V ignition logic level. Normal 12V direct battery connection is always available whether the car is on or off. So even if I shut the system down there should be a way to boot it up automatically with ignition signal. One way may be using a microcontroller. Is there a easier solution?
Still so many people are suing FM radio since so many old cars are still in the market. I dont want to use any usb device because I dont want to sacrifice usb bandwith for anything. I may use usb for android auto, so usb bandwidth is very precious.
My main concern is can I directly connect it to fm cable? I have no experience on it maybe signal has to be amplified or vice versa.[quote=“danielt, post:2, topic:2107”]
Any recommendation for fuse usage?
Board should not be drawing more than 24W. In fact IIRC 17W of this budget is for powering downstream things either via USB or via the LS connector. In other words you can use quite a small fuse; 2A is a sane default but you could probably tighten things further if you want to.
I am afraid of it if there will be short circuit on the pcb it can draw so many current from the battery and burn something. If we include the current consumption for lcd and usb , do you think that 2A is too low?[quote=“danielt, post:2, topic:2107”]
Is anybody experienced powering from battery, is there any issue?
The voltage input for this board ranges from 6.5v to 18v so there should be no point when the car voltage is running out of spec (car looms can are 12v nominally but can reach up to about 15v, is that right?).
I’m afraid I don’t know the power draw figures that would let you calculate how long you can run the board for on a battery.
I think using external battery is quite dangerous as we see from samsung example. Especially in the car it can be quite dangerous, I give up from this idea.
Many thanks for your answers. I am looking for your replies.