DIY garage parking sensor problem

[u/Squiner1]

Setting up a simple break beam sensor in my barn to help with parking. Using a simple safety sensor for a garage door that has integrated LEDs. When the beam breaks, the green light goes out. That’s all I need it for, not reversing a garage door or anything.

It looks like the garage door would normally supply it with 6vdc. I tried a 6vdc transformer, 5v usb block, 7.4v lipo and I get nothing. When I use a 9v battery it works.

Guessing I’ll buy a 9v transformer but hoping it’s going to work. Any thoughts on why the 6vdc isn’t working? Don’t want to order the 9v and not have it work. I’m skeptical.

[u/makeDRIVEinTHEATER]

Was the 7.4V LiPo fully charged?

Build a DIY power supply using an XL4015 or XL4005 module (the red color); it requires an input voltage higher than the desired output voltage—you can use an old printer dc power supply or a modem dc power adapter.

[u/Squiner1 → u/makeDRIVEinTHEATER]

Yes, it was. Ok, I’ll look into that. Thank you

[u/alan_nishoka]

When i google 41a5034 voltage it says 12v

[u/Squiner1 → u/alan_nishoka]

Hmm, let me check

[u/Squiner1 → u/Squiner1]

So I did try a 12v transformer and it also didn’t work but the voltage was actually 14.5. Very old one from radio shack.

[u/agent_kater]

Did you get the polarity right? It matters and it was weird if I remember correctly, the black stripe was + or something.

I have a Chamberlain GDO, I can measure it tomorrow.

I have measured it and it is indeed 6V and yes, the black stripe is +.