This video will give you overview of how to build a wireless/cellular activated hog trap door.

You can build for $200. Plus 2 days work!!!! A few key points.
1. Get 4g LTE. The controller will cost more than a 2g but ATT not going to support 2g much longer. You only need one channel. Att charges $30 to activate then $10/month if you add to existing plan.
2. Latch (release). Get a old or buy new car door latch. It holds weight of door but releases with ease. I got mine free from a collision repair shop.
3. Look for external antenna if you have issues with reception.
4. I used a 4 port car relay ($9) for the power to solenoid so I did not risk burning up the control board relay.
5. You will need cellular game camera to send you pictures so you know when to activate the gate.
6. Checkout TwistedTineRanch.com website or Facebook for more detailed pictures.

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