DIYbanter - View Single Post

Tony Hwang

AZ Nomad wrote:
On Sat, 20 Dec 2008 16:42:40 -0700, Tony Hwang wrote:
wrote:
My gargae door started not going down all the way a few days ago but
not all the time. Last night I tried to adjust the lasers on each side
now it doesn't go past the bend at the top of the track. Where are the
lasers supposed to point toward. And should there be a green light on
each side?
Hi,
I think it is IR emitter and senor pair. You have to align the IR beam
to the sensor. You watch the sensor output with a multmeter.while
adjusting the emitter position. When it is adjusted right, the sensor
will give highest output.
I use an IR detector card to make this task easy. Stick the card on the
sensor and when the beam is aligned, you'll see red dot on the card
sensing area. I bought this card from electronics parts store.

Nobody uses a meter. You simply look at the LED at the receiver and
aim the emitter until the receiver's LED lights up.

It is a safety measure to keep the garage door from coming down on some kid's
head. It has nothing to do with track alignment. Most likely, there's a
bent track or problem with the counterspring.
Hi,
You funny, I said light of beam alignment and where the track alignment
comes from? Using a meter is more accurate. Peak reading means good near
100% alignment.