I ordered these $3 motion sensors from China I don't remember when, they just came this week, I had sometime at lunch to test these out. It seems to work quite well. I may have this trunk open by kicking the bumper somewhere... this summer :-) Slowly but surely.
I don't really know what I ordered... I have to look for
the record, but I remembered this one will work at low light also. When I get the relays and stuff to actually open the trunk, I think I mount this inside the trunk and drill a tiny hole for sensor to see. Now, I have to look for a relay that triggers at 3.3V, if not I have to built the 1 shot amplifier and I don't want to do too much... :-)
I do have some plumping tub laying around, good idea too. Jake!!!
How the heck they can sell these circuits for $3 (actually they charged shipping)? I can't even build these for less than that myself.
This circuit will trigger a relay of 12V or Ground
Originally Posted by dvs_dave
Handy. What circuit will you tie it into?
Also you will need to ensure it only works when the vehicle is unlocked, stationary, and only with people, not pets etc. I would think another PIR in the rear screen would solve that last issue?
Tied to the electric trunk latch that we currently use on our A8. I need to measure the latch voltages to see which one actually release the trunk latch and turn on the motor. I bet it's a 12V transferred to a pin on the latch when we press the latch, if that's the case, this one must latch the same 12V to the activating pin.
While the trunk is opened, I'll look into the close button on the top also, I want to press the remote to close the trunk while it's opened.
The safety thing is easy when the other one works.
While we're driving, we don't want the trunk to pop up? I'll disable the power when the ignition is on.
I want to make it simple so everyone can build without much problems...
Mods: Lowered approx 10mm all around (Sport is already ~20mm lower than non-sport), Auto open and close windows and sunroof via remote, Seat belt chime delete, Cross-drilled front rotors, Painted Brake Calipers, Rear H&R spacers, Fogs as DRL (yellow), Trunk Close via Remote (Thanks Louis), Parking Brake Launch (Thanks Mishar) and Illuminated Door Sills. Future mods as I get inspired...
Final Circuit for "Kick the trunk" now is the wiring - need help!!!
After trials and errors and researches - I found the final solution for my "want to be problem", kick the trunk to open/close with my foot - The questions I have if you know, please share-
1. When the car is locked - what happens to the trunk latch - it seems the latch has no power - is the power is removed from the latch and which wire is this one? Because according to the "remote trunk close" last time - when we latch - Green wire get pulse of 12V at the latch. If the latch 12V is removed by the computer - then I want to power my sensor with this 12V --> Locked - no power - unlocked = powered.
2. When the car is locked - does power come to the DVD navigation? I know it turns off when not in used.
3. I want to use the Locked state to turn off the power of the sensor and Unlocked state to power it.
It's getting very close - Can't wait to try out this weekend.