Thread: Lilliput auto video switching for reversing camera

Originally Posted by moto_noob

But how do you get to the secret menu? Also about the button board, as stated i do not have one, would you know the diagram for the wire so i can splice into it for the av select buton?

That I on the other hand don´t know anything about. Don´t even own a liliput screen but this electronics can be used with other monitors aswell...Works with same principle, press AV button, monitor changes to AV1, AV button again and we go to AV2, AV btn, AV3, AV btn and back to AV1 for example...

did you make this by putting it on a circuit board and soldering the PIC and the 5v relays on to it? could you post a pic of what you have done? also what kind of 12v relays are those?

for consideration, can't you just power the camera through something else like the license plate lights instead of the reverse light. sure the camera stays on, but it doesn't matter rite? that way you wouldn't have the de-power issue because the camera doesn't turn off.

any 5v pcb relay should be fine correct?

moto_noob - To get the 'secret menu', use the Lilliput IR controller and press Menu, then 5,8,8,9,9,8.

Sorry, I didn't take any photos of the circuit I built. I used vero board (stripboard) and soldered a 20 pin ic holder to it for the PIC and the various other components also. The relays I used were simple PCB mounted relays.

In my first post I gave a link to the 5 volt relay I used:

www.farnell.com

5v relay - item number 189023
12v relay - something similar to item number 1652598

Any 5 volt and 12 volt relays should work, but PCB mounted relays are smaller and make for a neater job.


Hope this is useful

yes it was very helpful, clarified a lot. thank you.

could you draw out the pin connections for the 12v and 5v relays also? the 12v relay i ordered was similar to the one you pointed, however it seems it is the 2 coil latching. also which 5v regulator did you use?

I'm not sure if a 2 coiled latching relay will work, because when the vehicle is put into reverse it energizes the coil and when taken out of reverse it de-energises the coil. A latching relay won't return to it's original position until the other coil is energized.

Anyway, the pinouts for the relays can be found as .pdf files on Farnell's website.

For the 5 volt regulator, I used a standard L78M05CV, the Farnell item number is : 9756043, but if you search for L78M05CV, it will also be displayed.

A diode should be connected across the relay coil to prevent a large voltage spike when the voltage source is removed from the coil. [source]

Unless of course you are using relays with internal diodes...

the 5v relay from the first post is a 2 coil latching one? also when connecting to the AV button on the lilliput is it like this ?? ---[buton]--- where the dashes are two points. do i solder on each side and connect to the 5v relay? and what is the polarity on the sides of the button?