Reddit mentions of InstallGear Universal Car Power Door Lock Actuators 12-Volt Motor (2 Pack)

[this] (https://www.amazon.com/Universal-Power-Actuator-12-Volt-Motor/dp/B00CZBQCR2/ref=sr_1_1?ie=UTF8&qid=1467696805&sr=8-1&keywords=car+door+lock+actuator)

Door lock actuators (Amazon also has set of 4 if you have a 4 door)

https://www.amazon.com/gp/aw/d/B00CZBQCR2/ref=mp_s_a_1_3?ie=UTF8&qid=1517585328&sr=8-3&pi=AC_SX236_SY340_FMwebp_QL65&keywords=door+lock+actuator

Cable door lock adaptor kit I also used

https://www.amazon.com/gp/aw/d/B009Q119LI/ref=mp_s_a_1_16?ie=UTF8&qid=1517585478&sr=8-16&pi=AC_SX236_SY340_QL65&keywords=cable+door+lock+car

So it looks like the kit I ordered is out of stock now but I will double check when I get home.

Here's the link: InstallGear Universal Car Power Door Lock Actuators 12-Volt Motor (2 Pack) https://www.amazon.com/dp/B00CZBQCR2/ref=cm_sw_r_sms_c_api_jsKDzb5GR2HB6

Edit: this is not what I ordered, but this is the seller. The kit was $30 and comes with everything. I might document the installation.

Looking at your picture... You have the ultrasonic part. Then you need either a servo to raise the lid or one of these power door lock actuators with some mechanical engineering. https://www.amazon.com/InstallGear-Universal-Power-Actuators-12-Volt/dp/B00CZBQCR2

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Personally, I would probably use the actuator and a relay. When distance < whatever, activate relay, which activates actuator. Easy peasy! If you need more help working this out, let me know.

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I would like to see you write the code to fire off the relay even if it is not attached.

Here they are, you'll need relays of course and if you do the alarm it'll lock them when you're driving automagically and unlock when you stop driving. It's really nice.

There is nothing special about any power door lock solenoid. They are all pretty much Chinese crap.

$10 a pair on Amazon. Will last about 3 years. Piece of cake to replace:

https://www.amazon.com/gp/product/B00CZBQCR2/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Yeah. Here's what you want

• Door lock actuators
  
  • When you pull the door panels, you'll see a rod that moves back and forth to push the lock on and off. You hook these up to that rod inside the door and run the wires from this actuator to a spot under your dash where you'll install the brain.
    
• Power door unlock 'brain' receiver/transmitters
  OR
  You could put a full alarm system in - though this is obviously more complicated. I'd recommend any 'directed' system, only because that's what I'm familiar with.
  
  Obviously the full alarm would be more complicated to install, but only marginally. There's also the possibility you clip the wrong wire and mess something critical up...
  
  If you wanted to put in the actuators yourself, I'd say go for it. Give yourself a weekend with at least 12 hours of time to spend on it. It won't likely take that much, but you don't want to run out of time half-way through. Maybe you could get the actuators installed on one day and the brain on the next.
  
  This one seems like a good reference for the actuator install
  
  OR - you can buy the genuine mazda actuators and then you only have to worry about wiring them up. A quick google shows replacement parts available for $20-40 each door... You might even find the car/door is pre-wired for them.

Hmm. Even an aftermarket one? The fronts recently crapped out so I had to replace them with these guys. Just like the original ones, they only took two wires.

You could make something like this https://www.youtube.com/watch?v=UMskp5M8Igw using a cheap car door lock actuator and keyless entry system

http://www.amazon.com/Remote-Central-Locking-Keyless-Controllers/dp/B006QH9C5A
http://www.amazon.com/Universal-Power-Actuator-12-Volt-Motor/dp/B00CZBQCR2/ref=pd_bxgy_e_img_y

You can use a small 12V motorcycle battery as the power source.

http://www.amazon.com/ExpertPower%C2%AE-Rechargeable-Sealed-Battery-BLMFM12_7/dp/B003S1RQ2S/ref=sr_1_2?ie=UTF8&qid=1415825130&sr=8-2&keywords=12v+battery

And if you feel ambitious you can hook it up to a solar panel recharge so you don't have to charge or swap the battery.
http://www.amazon.com/Instapark%C2%AE-Black-Mono-crystalline-Charge-Controller/dp/B004FOEUI0/ref=sr_1_3?ie=UTF8&qid=1415825203&sr=8-3&keywords=12v+solar+panel

I bought some door actuators. They use linear movement. Combine that with a L293D chip to change polarity and you have a simple button pusher for cheap.

PIXNOR 10pcs L293D DIP 16-pin IC Stepper Motor Drivers Controllers (Black) https://www.amazon.com/dp/B00ODQM8KC/ref=cm_sw_r_cp_apa_EkxBybF3HW1ZK

InstallGear Universal Car Power Door Lock Actuators 12-Volt Motor (2 Pack) https://www.amazon.com/dp/B00CZBQCR2/ref=cm_sw_r_cp_apa_OjxBybTETBVE1