P38A tapping into BECM signals with an arduino

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See if our bloke can tap into its becm??o_O
You might get folding mirrors out of it:D:p

Can manage the mirrors. Can't see that a phone call at 3 AM that you had left the lights on would go down to well either if you forgot to switch them off at 10 o'clock. I tend to be able to detect if the lights are on or not. 25 mile range and 8 MPH terminal speed, it's a doozer. :D:D
 
Can manage the mirrors. Can't see that a phone call at 3 AM that you had left the lights on would go down to well either if you forgot to switch them off at 10 o'clock. I tend to be able to detect if the lights are on or not. 25 mile range and 8 MPH terminal speed, it's a doozer. :D:D
Wow 25 mile range, thats a bloody long bit of cable its got on it.
 
So.... I went with just checking if the ignition is on to trigger fold / unfold (there's also a button you can press)

https://photos.app.goo.gl/qshLHKa2wYzqBdB1A

They're Discovery 2 mirrors. If you saw off the bottom half of the ally bracket it slides nicely into the plastic bit from the P38, then it's just a case of wiring it all up. I used an Arduino and a couple of relays for that.
 
So.... I went with just checking if the ignition is on to trigger fold / unfold (there's also a button you can press)

https://photos.app.goo.gl/qshLHKa2wYzqBdB1A

They're Discovery 2 mirrors. If you saw off the bottom half of the ally bracket it slides nicely into the plastic bit from the P38, then it's just a case of wiring it all up. I used an Arduino and a couple of relays for that.

Good work. And don't let anyone put you off your investigations - if you don't explore you don't learn. Andy by exploring you have proved that electric folding mirrors can work - so onwards and upwards!

Pete
 
Should have done pictures to show which bit you "sawed off" !!

It's pretty straightforward, the disco 2 bracket tapers from the outside to the inside (nearest the car is thickest). You just need to cut the whole thing down so it's one thickness, start with your blade flush to the bottom of the bracket at the outside edge and cut downwards so you're cutting the taper off.

If anyone's got a broken wing mirror off a discovery II they want to send me I can do it again and take pictures :)
 
Was also wondering why you used Arduino rather than £15 disco Ecu ?
The Arduino board I got for £3? Hmm...
Seriously though I did buy an ECU and switch from a disco but a) the switch isn't debounced, so it's a pain to consistently press it for just the right amount of time. b) it doesn't trigger with ignition on / off (as far as I know) and c) the connectors are a pain to source so you either have to make your own connectors or do some fiddly soldering on the switch and the ecu.

Also the Arduino has 5 or so GPIOs spare, and WiFi in case I want to do anything else with it.

This is the board I used:
https://m.ebay.co.uk/itm/UK-NodeMcu...490456?hash=item3d71565d58:g:VsMAAOSwkY9bfibJ
 
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