Bypass garage door safety sensor.wmv

Look in my channel for new video "Bypass Garage Door Sensor using 555 timer " for the electronic circuit.
How garage door safety sensor works. This video does not show how to bypass the garage door safety sensor. This video only shows how the safety systems works to help you to troubleshooting in case of problems.

[@FuquarProductions]

Finally someone who ACTUALLY EXPLAINS the electric eyes. Thank you! (12 years late)

[@mikepf53]

Thank you. You saved me from getting my equipment out and figuring out the circuit. 555 will work great.

[@billknott3628]

THANK YOU! Understanding HOW the system works has made it simpler for me to diagnose and repair my garage door opening issues!

[@jessie4735]

it took me about 6 months to find a smart video explain how to simple volt test and the connect terminals 1&2&3 with sensor , thanks you

[@markwisniewski701]

What is the video [e-mail]

[@nivaldo758]

Very nice and well prepared video. It is a very well explained how sensor works and why it protect when door is moving down. Good job.

[@mytubeniche]

Thanks... I learned a lot from this video. I will go back to figure out why my sensor lights are not lighting up and check them by connecting them direct to the screws and see if the lights come on. Keep up the videos like this. I appreciate your efforts because the manufacturers do not post these type of online videos to help us!

[@vicbulge]

Great video. 9 out of 10 garage door video's spent 5 minutes talking about aligning the sensors. WE KNOW HOW TO ALIGN SENSORS. From your video I was able to figure out WHY you can't just jump the common ground (2) with the sensor (3) post and take out the sensors all together, you need the timed pulse that the sensors provide.I was able to troubleshoot by taking the wire runs out of the equation and hooking the sensors up directly to the drive unit. Also nice to know the voltages, next time I'll just check for voltage at the sensors. In the end I had 1 shorted (+) wire in the attic that presented a curve ball at the unit when trying to diagnose. So the 3 hours I spent tonight will help me out next time. Thanks again, good to know HOW it works before you just try and follow someones steps blindly.

[@markallen6502]

Thanks for the technical information especially with the oscilloscope output. Since I do not have a scope, this was very helpful!

[@adamtrombino106]

While not what the title says, I was able to check with my scope what issue I was having thanks to the specs given in this vid. VERY HELPFUL and a quick test. In my case, the internal board had gone bad and was not sending the correct pulse voltage. Rather than just throwing parts at it or trying to disable the system, which is dangerous and the safety system must work if you are selling the house, for example, ( so you'd have to fix it correctly anyways) I was able to save time and have mine work correctly once again because of this vid. THX!

[@alaskapgm]

Excellent video! Your explanation helped me to diagnose why our garage door will not close. I could not find information on how much voltage was required to operate the photo sensors. Your video explains it very well. Thank you!!!

[@davidslott]

This is great, far better than the garage door companies, for understanding how they work. It's not a good idea to bypass the sensors, but this can help you understand how to fix them. Note: on most garage door openers if you hold the wall switch, it will bypass the sensors and the door will go down.

[@abushma]

Thanks for posting this video. It was very helpful for me to troubleshoot a problem with my garage door sensor (loose connection at the base unit!) that was causing intermittent failures (door not closing completely before backing up).

[@rajarampejaver6689]

Thanks for this highly informative piece. I couldn't find any other explanative post. There may be a minor inaccuracy around the 10:15 mark. I think the transmitter is just emitting a IR beam. As long as the receiver sees the beam, a timer in the pulls the positive wire to ground briefly after ~650 ms and resets itself. No need for an oscillator anywhere. But, I don't know if I am correct. Your solution is also quite simple and brilliant. Thank you for your effort. I wish there were more people like you, instead of those that question the need for the solution.

[@ircraig2]

I really appreciate this video... just started troubleshooting my system and after looking at the schematic I was wondering what kind of signal was being used to via the photo-eye. Good job

[@detroitdrew7834]

Great video man thanks for taking time to show everything.....

[@gregbradford7963]

Thank you, Sir. You really filled in the gaps in my knowledge. I'm working on one currently that looks to be the exact same brand & model. I measured 6+ vdc where the plug goes into the sensor (they're really old). No LED's come on either side. So I'm thinking: if I DO get past the fact nothing is even powering up, how can I determine it SHOULD be telling the unit the light hits the eye? You have given me the answer. Showed this to my buddy - he enjoyed it too. Good job!

[@jimmybrown9845]

I would like to say thanks for the video . it will help me determin if I have bad sensors or bad wiring . thanks a bunch !

[@allprogaragedoors9311]

Very cool video...now I know the principles behind how these camera's work. Good job!!

[@ldabkey]

Thank you for this video and excellent explanation of how the sensors work. Now, I'll have to work on a circuit to bypass them.

[@MrEnergyFree]

+Lee Dabkey Look in my channel for new video "Bypass Garage Door Sensor using 555 timer " for the electronic circuit.

[@SupportatVRXCompany]

Thanks for the analysis with the oscilloscope. That answers questions no one else on the internet had described as well. At least with over an hour of searching. This also shows how you cannot (nor should not) by pass these safety devices in any simple way. I am going to guess that in the controller board on the opener is a re-triggerable "timer" with a time constant longer than the 6 mS pulse. So long as a pulse arrives to re-trigger the timer before it times out the door is allowed to close. Good job MrEnergyFree.

[@putnum2000]

Excellent video. I have been having trouble with my opener and this explains it. I'll hoo up my scope this weekend and see what I have. Thank you very much....good job.

[@willisiam9346]

Very nice. Thank you for taking the time to make this video. Very helpful!

[@knowhereman1]

I wanted to confirm that I have a bad receiver sensor. The wiring checks good. Now I can order a replacement with confidence now that I see how they work. Thanks for the video.

[@genefox6330]

Great demonstration! That is what I like to see!

[@MrEnergyFree]

Hi All. When I was doing this video I was planning to bypass the garage door, but instead, I learn how do they work and I was be able to fixed. I am sharing what I know and all the information that you need to use a 555 IC and make your own bypass. It is very simple after see this video, all the timing is in the video. I am sorry but I will not review how to do it because liability. Thanks.

[@tigger126]

Got it! Thank you

[@NeilCaulfield]

Very useful info, I am using garage door sensors for a project and needed to see how to wire them and get a signal, will give it a try!

[@duffcosmos6458]

Great video...saved me the time and trouble of eventually going through the same procedure after several hours of wasted time trying to see if I could bypass sensors. The answer....NO. Taping the sensors together like other people have done is really the only way. At least there is one way as long as you have two good working sensors. If not you're SOL. I understand why that is now....thanks again for showing this.

[@davidslott]

Again, brilliant job, sir.

[@RB-hj7qc]

Thanks for the video. Very helpful.

[@tminitube]

I had the same sun problem. I bought a replacement sensor set (about $25 from Amazon) and connected the transmitter sensor to a 2 AA battery holder from Radio Shack. Whenever the sun is an issue, I place my hand-held transmitter sensor next to the wired receiver sensor and close the door. This keeps the opener's safety components in place but gives me a simple/safe override when I need it.

[@TimMassaro]

Thanks! Excellent explanation and good info to a mystery...saved me some time and effort!

[@vinlinch]

Great video. I learned a lot after watching this video.

[@yubastardus]

Thank you very very much. Just what I needed and what I suspected was happening.

[@nibornm1]

Really helpful, excellent video MeEnergyFree! This enabled me to find that the cable to the transmitting sensor was broken. Thank you very much.

[@dawilson47]

Thanks!!! You saved my weekend!!!!!

[@jimc2519]

Thanks for the explanation. Great help in troubleshooting a problem with my opener.

[@infoshapirogroup]

Wow Simple for you. Your explanation was just awesome. Never had a clue that the sensors transmitted and received. Okay do not really understand about the mil sec pulses and how they work but I can see they are needed to make the door work safely. Thanks for putting this you tube together.

[@MrSebastianr2005]

Great video , thanks for putting in time

[@atpst81x]

This is a great video, good explanation, very concise.

[@emgee9892]

Thank you for this video! Wish I could give you the money I saved!! awesome job!

[@n4mwd]

THANK YOU so much for explaining that.

[@stradivarius6411]

Esto explica mucho el problema que tenia tratando de bypasiarlo. Gracias hermano.

[@johnalcazar4318]

Stradi Varius entra al board electric y lo haces bypass

[@nadanutcase]

A good clear explanation - thanks

[@stevenlefebvre2991]

Very good video thank you so much. Save me the effort of climbing up there and trying to figure it out myself.

[@TheIriereggaefan]

nice technical discussion explaining why you can't just bypass the transmitter/receiver. Thanks!

[@fedchairboy]

Nicely done video.....helps explain in a very straight forward manner.

[@11232javier]

Thanks alot this help me fix my garage 💪🏽

[@waltbowen538]

Outstanding video. Thanks!

[@Marconasser1]

Excellent video, very well explained.

[@stanleycstanley]

Just did mine, thanks for sharing, some of your viewers are not paying attention

[@georgesidhu460]

Very good demonstration, thank you

[@JuanSanchez-ik7wx]

This electrical engineer gives you a big thumbs up.

[@karich21]

Great video. Thanks!

[@handy1326]

Excellent! We are using garage door openers to open/close the roofs of remote controlled astronomical observatories. The safety sensors were taped together so the roofs would always operate. However the little black boxes are not waterproof proof. Or dust-proof. Dust obscured the optical port of one of the devices and dew and/or ice formed on the other after heavy rain! This disrupted the signal and made it impossible to control the roof remotely. I took the little boards out of the black boxes and, with the help of an EE friend, deduced what you have shown. We too were initially puzzled how the control signal could be sent without a third wire. Then I found the tiny surface-mount comparator that is being used as an oscillator on the IR transmitter board. This was a couple of weeks ago. I just now discovered your video. Good work! We will now be working to make our observatories reliable. This failure was occurring in two observatories. Very puzzling when you are hundreds of miles from the garage door controller...

[@jozefkhoesial8520]

Thankyou Sir......needed this explanation ...may god bless you.

[@totalbullion5882]

Ah, you are the originator of this fix! Nice job.

[@Hot80s]

your video I helped me out a lot gracias

[@patrickcleland6065]

Excellent video!

[@chawlamohali]

Big help. Thank you.

[@landslide03]

Great video, I learned from your video that I could hold the garage door button down to bypass the sensors. That way I knew it was a sensor that went bad. I have it all up an working now, you saved me a ton of money and really explained what the sensors were doing! Thanks Again!

[@Browningate]

Told me exactly what I needed to know. +1

[@tekksavvy2242]

cool..i took electronics courses in college just to understand this concept and test it via oscilloscope... tons of potential in this concept for cars without auto reverse windows for safety!

[@ronnycornejo1728]

I've wanted to see how to bipass the sensors, but by looking at the oscilloscope explanation I've learned a hole lot...thanks anyway

[@GG-ix1nr]

very good video I learned allot..thank you very much..keep up the great videos

[@gerrypineau]

This is the very best video available for connecting the safety sensors on the Chamberlain lift master. It took me several days of searching until I found this video. The chamberlain website an documentation is useless without photos.. They should take notice of this video and add videos to their online support pages.

[@mississippiqueen2164]

I'm relieved I'm not the only one who finds those jumpers hard to deal with!

[@mjsidoarjo2763]

Very clear explanation, I save $300 for I did by my self

[@allanantes3173]

Thanks your video was very helpful. Now I know that bypassing the sensors would be difficult off of the board.

[@64FulcrumFreak]

Thanks to this video i fixed my garage door and saved me lots of headaches and time,i didn't know what to do with the sensors, thanks a lot bro : )

[@tsa1560]

Thanks worked out for me😀

[@smclindsey]

Thank you! That helped me understand a lot.

[@jesusbriceno9320]

Amigo le felicito, no le entindi nada de su idioma .. pero lo explicaste tan perfecto que lo entendi muy bien. con todas las pruevas que haces..... espero que lo traduscas .... GRACIAS DE UN TECNICO DE VENEZUELA ........ SALUDOS....

[@alaintorres6878]

gracias socio. Buena explicacion.

[@SmartElectronics]

Good video, and just what I needed: thanks for posting it.

[@moha5aldi]

Thank you! You deserve 👍

[@DennisMathias]

Finally someone with technical acumen to explain my problematic garage door. Thanks. But why do they pulse it. Why isn't it just a photointerrupter?

[@1personalt]

so you cant just short the terminals out

[@daddybear7062]

And asked to be a pulse otherwise any source of light within the Frequency range could cause your door to reverse

[@stevebarnes8008]

Thank you!

[@DerekBrunt]

I've wanted to know how the safety sensor system worked with only 2 leads (Power and Com.) on both heads for a while now. Thank you so much.

[@Dajosco]

Great man! exactly what I wanted to know. Thanks for taking the time and sharing!

[@sharzanco]

Very useful episode

[@rickheintz]

Cool. So I was able to bypass the sensors by holding the button down until the door closed all the way. Thanks.

[@johnguilfoyle3073]

I did this when I installed my opener. I mounted both sensors to a board with six inches between them to test the functionality and left it that way for years. Without kids and pets, it's a low-risk situation since the pressure and limit sensors are still working.

[@TommyBaldwin652]

The reason the opener works when you short out one and two is because that is normally that's where a wall button would go.. the wall button will open and or close the door at any time. With with a wall button you have line of sight on your garage door. Or you should and that is an override for The Infrareds. So when you short out 1+2 or bridge them basically what you're doing is you're pushing the button on the wall. Normally you push it and let go it's a quick short enough to signal the motor to move. However when bridging it or holding the button and not letting go you are overwriting the infrareds you're allowed to do that because once again because you have the line of sight. This is a built-in feature of every garage door opener..it's basically there in case you can't close your door and a guy like me can't come to your house within 10 minutes if you want me to be there it'll get your door closed for the evening and you can once again you have line of sight and its owner or user responsible at that point. This will not work with remote controls your remote controls cannot override your Infrareds only your button on the wall and once again why because you have line of sight or at least you should. I'm pretty sure the new UL 325 doesn't allow for it button anywhere besides inside the garage with a line of sight on there garage door opener and garage door. Newer garage doors you can close from your phone will emit a siren or an alarm for 10 seconds before closing the door there is absolutely no way to override your Infrareds believe me we've tried we've tried hundreds of times every which way we can there is no way to override it unless you want to start taking circuit boards apart and redoing them you pretty much can't do it. . And with small children and pets valuable cars. Why would you want too? Keep them clean. Don't put shit near them and don't let your dog piss on them. They will last 20 years or at the very least the life of the opener. There's always the exception to the rule but for the most part they don't go bad. Any garage door guy that comes your house and tells you you've got bad Infrareds is most likely lying to you. You've either got a cut wire or they are not lined up. How do I know this ? I've been doing Garage Doors Gates and Operating Devices as a licensed contractor for well over 30 years now that's how I know. You're all very welcome

[@MrAsmodath]

All true. However, saying it's impossible to actually bypass them is not true. I can pretty much garuntee you that if I found out the right pulse timing for my opener, and then using an Arduino or really anything similar, some other bits and pieces to match voltage, and 30 mins of programming, I could use that to trick the opener. Removing the actually sensors completely. But why go through all the effort when you can just tape the two of em together in 2 mins and boom, you're done, same result, less work.

[@TomWill2]

Thank for the information you provided on how the eye sensors work, but nothing about "Bypass" garage door safety sensor.

[@UsMaLeMan1]

He DID show you how to bypass it...duh. Disconnect the green sensor, splice it into the wires feeding the yellow sensor, mount or tape the sensors to something so that they stay facing each other, and wallah...technically the sensors ARE bypassed.

[@FYIGuy01]

UsMaLeMan1 Actually, technically the sensors are not bypassed since they are still in the circuit. It is only the safety feature that is bypassed.

[@MrEnergyFree]

+FYIGuy01 Look in my channel for new video "Bypass Garage Door Sensor using 555 timer " for the electronic circuit.

[@darrinemperato5516]

Good job...thanks

[@teashea1]

very well done ----

[@iammarkfitz]

Great job.

[@boashna]

bravo -- I was trying to get it to work without the light sensor .. no way possible

[@MrEnergyFree]

yes, there is a way. Look in my videos for 555 timer.

[@soccerfanyes]

Would be interesting to look at the signal on the garage door opener feed lines to the sensors with the scope to see if the pulse is present without the transmitter in the circuit. I'll bet it is. This would allow the garage door device to send the signal, then look for a return through the photo-eye path and the two would need to be in phase. That would keep an alternate square wave from replacing the transmitter signal. Simple but effective.

[@chriscorts3337]

Thank You.

[@raymondjoseph7406]

Thanks a bunch bodie.

[@MotesTV]

Thanks for the o-scope readings MrEnergyFree, I leant my o-scope to a friend in another town and it will probably be a couple weeks before I see him again and retrieve it. My garage doors sensor stopped working, and I was able to use this information to create a bypassing circuit. For others, the circuit diagram can be found seen at 206.255.233.35/garagedoorsafetyeyeshack.bmp, until my ISP changes my IP.

[@JARoot-ic8wy]

Very interesting. Now know how those pesky things actually work. Thank you

[@nicknameless5342]

This video is definitely only for educational purposes. I bought an opener with an optical sensor, but in 2 tests out of about 100, the door didn't stop closing when it was blocked. Then a few days later a child in a nearby city was crushed by an opener (brand unknown), so I take down my new opener and get another brand that I've never been able to make fail. The optical sensor is the only safety device that works really well. Don't defeat it.

[@joefiddle52]

Excellent demonstration! Thank You

[@stevecipriani2867]

thank you!!!!

[@1985230ce]

This is good information. I was thinking that I could use a jumper to bypass the sensor to test whether the sensors are bad or something in the motor box. Now I see that I cannot. BTW the light does change states when the beam is blocked so it not likely an alignment issue. This doesn’t mean that the signal is getting to the motor box. Since I left my o-scope in my other pants, I’m pretty sure that I can use the frequency mode on the DMM. Question: is the pulsating signal generated at the sensor or in the motor box?

[@matthewtrickey1433]

This is Richard Gellis, and my comment" this vid provides all that's needed to be said, take heed, proceed.

[@robertlanosa5095]

thank you

[@TheVintageEngineer]

After looking at the waveform it seems pretty simple to override the sensors. Assuming the High of the pulse is 6 volts and the Low is zero all you would have to do is have a pulse generator that controls a switch to short out post 2 and 3. It would generate a 154 Hz (1/0.0065) frequency pulse with an 8% (0.5/6.5) duty cycle. When the pulse goes high the switch is turned on and shorts post 2 and 3. When the pulse goes low the switch is open giving the open circuit voltage of 6 volts. Get your self an arduino and a transistor and your in business.

[@MrEnergyFree]

+Anthony Shelton Look in my channel for new video "Bypass Garage Door Sensor using 555 timer " for the electronic circuit.

[@irnesvalencia6146]

Gracia muy útil la informacio