Wireless Remote - 4 Channel Relay? Electricians help please?

[Delta3D]

Hi there,

So a little background. I'm doing a little project on my car. I want to make my own valve controller for an S3 8V (2015) so I can have buttons to do the following functions mapped buttons on a wireless remote.

Buttons:
A: Open Valves
B: Close Valves
C: Factory Functionality (Bypass this chip)
D: Nothing (Can't seem to get widely available 3CH Relay?)

The valves function is really simple.
3 Feeds of:
A: Power (Fed from car, so presumably 12v with fluctuations up to 14v)
B: Switch
C: Ground

To open the valves, the switch feed is grounded out, and valves open

To close them, switch feed is not grounded.

What I want to do, is make a combination of buttons to force this to either open, close or OEM functionality.

Question 1:
Would this work?
https://qiachip.com/collections/dc-...remote-controls-kr1204?variant=22446066827312

Question 2:
Would the feed varying between 12-14v affect that chip by burning it out?

Question 3:
How would one ensure there is no moisture inside the box when left attached to the underside of the car. Just glue a plastic pvc type box together around it?

Any help is much appreciated!

Cheers

 

[Delta3D]

*Snip*

*Snip*

That's perfect, thank you both for your input I really appreciate it. And it's a great help!

I hope this video helps explain what the switch feed would be using. I'm guessing 0V?

if not I can go down to the garage and test with a multimeter to see. I've got a 14v power supply that actuated the motors when I had the below setup and touched the switch terminal to the ground?

POWER Supply
Red Terminal - Valve 12v Terminal
Nothing - Switch Terminal
Black Terminal - Valve Ground Terminal

https://www.youtube.com/watch?v=nOp8vng52PY

 

[Delta3D]

I'd be tempted to set it up with the two relays as chansgeovers, with the first being an auto/man changeover. and the second being whether manual is on or off.

You only actually need two channels, think of it as two bits, and of the four states that gives you, two are the same. (the first to control whether it is factory functionally or manual, and then the second to decide what that manual state is)

Also regarding this point, I had a think about it and agree that this could work well. However my main issue would be determining what state it's in. My main drive to create this is to avoid cold starting with the valves open as the neighbours will not be happy So just thinking it may be better to have 3 Channels just incase

Cheers

 

[Delta3D]

So have just done a test with the power supply and valves on the exhaust.

Looks like they actually open when the switch touches the ground and then close when the switch leaves the ground.

Have stuck a multimeter on the switch and it’s reading 12.8v on a 13.8v Supply

 

[Delta3D]

You could switch it around so the default is manual and valves closed and wire the board off the ignition feed so its only powered when the car is on, so that its always in a reset state when you turn it on

I believe the plug that the oem setup plugs into is CANBUS and turns off when the ignition is off anyway so saves sorting that.

I'm assuming for simplistic sake of creating the wiring I can just send the 0v feed back the earth in the factory plug? (Power, Switch, Earth)