How to Create a Basic Wireless Door Lock Release System

Wireless Release System Layout
Wireless Release System Layout

A wireless door release system works the same way a garage door opener works. As shown in the illustration at right, a radio frequency transmitter is used to signal a receiver. When the receiver receives the signal from the transmitter, it changes the state of a set of electrical contacts on board the receiver. These contacts are used to activate an appliance, such as a garage door opener, an electric strike or an electromagnetic lock.

Basic Electric Strike System
Basic Electric Strike System

In the basic electric strike system illustration above, a normally open switch is closed to allow power to flow to a fail secure electric strike. A wireless door release system substitutes a wireless receiver for the normally open switch in the illustration. One big difference is that, unlike a normally open switch, the wireless receiver requires power. Below is an illustration of the same electric strike system using a wireless receiver.

Basic Wireless System to Release an Electric Strike
Basic Wireless System to Release an Electric Strike

Notice in the illustration above that I have shown a power supply with separate outputs to power the receiver and the electric strike. I recommend this method to simplify wiring.

The biggest obstacle to having a completely wireless system is the electric locking device. At 12 volts DC, the receiver will probably draw less than 100mA during activation and less than half of that while on standby. It could certainly be powered by a couple of lantern batteries. Some electric strikes draw as little as 240mA at 12 volts DC, but even that will exhaust batteries quickly.

Wiring can be reduced by creating a battery operated wireless release system. To create a battery powered system, use a stand-alone electronic access control lock such as the Alarm Lock Trilogy that comes standard with remote release, or the Kaba-Ilco Eplex with optional remote release. These locks are battery operated independently of your wireless release system. See diagram below:

Battery Operated Wireless Door Release System
Battery Operated Wireless Door Release System

Troubleshooting

Wireless release system installations are more complicated these days because the system now must share the airwaves with a lot more stuff. Wireless routers, cellular and microwave towers, radio communications facilities and even computers can interfere with the wireless release system.

Notice on the illustrated wireless receivers in this article the bank of "dip switches." Dip switches are small rocker switches with two positions: on and off. Thinking of the dip switches in terms of computer logic, "on" would equal a one, while "off" would equal a zero. The ones and zeros you input via the dip switch bank communicate to the logic board the frequency at which to transmit or receive.

Many wireless receivers use dip switches to select the radio frequency that the system uses. Dip switch settings in the receiver and transmitter must match in order for the system to work. If your system is not working, make sure the frequency settings between the transmitter and receiver match. If they do, and the system still doesn't work, the problem may be radio interference. Select another frequency in both transmitter and receiver and try again. Repeat until the system works.

If this method does not work, the interference problem may be insurmountable and you may not be able to use a wireless system. In Rockefeller Center, in NYC, for example, the doppler radar system used to track local weather effectively prohibits use of wireless products (including cell phones) above a certain floor. If there is a radar installation or microwave antenna farm near your wireless release system installation, that might be the reason it does not work.

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Comments 8 comments

Research Analyst profile image

Research Analyst 7 years ago

Cool diagrams, these are some really nice technical hubs.


Tom Rubenoff profile image

Tom Rubenoff 7 years ago from United States Author

Coming from you, that's high praise. Thank you, Research Analyst!


Daniel Larose 6 years ago

This wass the type of information that I was looking for (Man Trap) Thank you for taking the time to post your knowledge on the internet. Regards, D.Larose Senate Protective Service - Canada


Tom Rubenoff profile image

Tom Rubenoff 6 years ago from United States Author

I am glad you found my articles useful, Daniel.


DEEPAK BHASME 5 years ago

YAA ITZ FINE BT IT WUD BE MUCH BETTR IF U HAD USED SM HOME MADE OR EASY METODS FOR D ABOVE SYSTEM.............


nyc_dweller 5 years ago

This is exactly the kind og information I'm looking for. I spoke to several locksmiths and security system providers and they all said this wasn't possible.

Can you recommend someone in NYC that could install such a system?


Tom Rubenoff profile image

Tom Rubenoff 5 years ago from United States Author

NYC Dweller, please use the "contact tom rubenoff" link above right to contact me by email. I will be happy to help you find a qualified installer for this kind of system in your area.


rahul 5 years ago

it's so cool to have it

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