HiTech

Hold on, we'll be right there!

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krl

how big shold the led's be?

v:
mA:

Type?

DAPortman

My opener uses 9 dip switches, but they are all single pole, triple throw (sptt). The throws are open (0), closed (+), and closed (-). I'm also having trouble locating info on the ic: +B8608 (top) MM53206N (bottom). I can't think of any way to adapt for sptt dips, any suggestions?

bradindenver

I have been in the garage door industry for 13 years.
can anyone tell me how to mod the remote to send all the codes at one time.
The new rolling codes work with a set code and a set clock. That is how it is so hard to break. But I think if you over run the buffer with to many codes at one time it would open the door.
The only way for me to test this would be to build a remote that sends to many codes at one time.
I know an airplane transponder does this to an opener.
It is just a bet.
[[/i]

Helder Ferreira

Hi,
First of all, a garage door opener sends the code in a serial form, in a series of "on's" and "off's" of different timings, usually starting with a "on" pulse of a known duration to syncronize a receiver. When the receiver receives a correct sequence, repeated a certain amount of times, depends on the decoder, it signals the relay to open the door. An ancient chip the TEA5500, used in old Renault vehicles, working no in RF but Infrared, locked itself out for some time, after, I think, 5 wrong codes. You could still hide some device to "steal" the code and then use it to violate the lock. With roling codes, the story is a little different. The Keeloq technology from Microchip, uses a very complex algorithm to calculate a 69 bit long key, every time it transmits a code. Each new code shuffles at least, half off the bits. The code is generated using yhe algorithm, a serial number, unique to each device and a user progammed code. The receiver knows exacly the code he's going to receive when the key transmits, so if it receives a pre-used "stolen" code, it will lock itself out. If you play with the key, without being near the receiver, you also risk being lockek out as well, sinse the receiver will not recognize your key because it can only calculate the the "rolled" key a few keys away from the last one. By the way, every key for a certain lock, must be associated, so each key is unique. It's therefor impossible to send more than one code at a time.

PS. Pardon my English.

Greatings,
HF

HiTech

You do realize that this thread is from July 2005!!

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Helder Ferreira

Yeap, I know. Just trying to answer the post from the 14th July 2007 about sending the codes all at once

cordcole

do any 1 now where to get the garage door open or any other circuit with out the garage door opener? shoud i use a microcontroller or should i spend $150.00 for a kit at http://www.plans-kits.com/kits.html?

tytower

Interesting -are the rolling codes used in cars different? I have a car key and a spare .When I use the spare after 12 months or so it still opens the car -different gear?

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Helder Ferreira

The receiver calculates and waits for the next code for each key. If you store one key, there should be no problem exept, maybe (I'm not sure) if the battery runs down. You can read all about rolling codes at www.microchip.com . They call it KEELOQ

shokjok

If you have a Sears Home Central depot where you live, you give them the model number and problem details ( or go online to Sears' website) to assist you in troubleshooting. If no manual is available, Sears can re-direct you to the manufacturer of the opener. I don't suggest playing around with this device, as household AC voltages can be nasty and unforgiving.