[tech] Door Circuitry
adrian at ucc.gu.uwa.edu.au
Mon Aug 30 13:53:42 WST 2010
*laughs* There's a short in the lock?
On Mon, Aug 30, 2010, Bob Adamson wrote:
> Well...this could have saved several hours of head scratching...
> Door relay is alive again. Fixing the short in the lock and replacing the
> fuse in the modem fixed it, though it took a bit longer to sort out the
> power issues. Turns out the solenoid and modem are pretty power hungry,
> and don't want to work with a wall wart.
> For future reference, you send ATH1F over serial to trigger the relay.
> On Sun, 29 Aug 2010, James Andrewartha wrote:
>> On Sun, 29 Aug 2010, David Adam wrote:
>>> On Sun, 29 Aug 2010, David Adam wrote:
>>>> On Sun, 29 Aug 2010, Bob Adamson wrote:
>>>>> Sad news - our door relay has kicked the bucket. Somehow the electronic lock
>>>>> got a short in it, killing the modem (!) that drives the relay. Of course,
>>>>> being UCC, this modem was a complete box of hackery. Adrian and myself are
>>>>> working on a simple circuit to replace it, but haven't had any luck yet.
>>>>> If anyone knows anything about how the old setup worked (particularly the
>>>>> success/failure sensing in the binary) please give me a yell.
>>>>> From http://www.ucc.gu.uwa.edu.au/services/door.ucc
>>>> The door lock is switched using the On-Hook relay of a modem. This
>>>> provides a cheap, reliable serial interface to the door lock.
>>>> You need to send ATD (or possibly ATH) down the serial line to make the
>>>> modem pick up the phone line. The thought occurs that you probably didn't
>>>> know that this afternoon which may have been why you couldn't get it to work
>>> Actually it's A0. I think.
>> strings /usr/sbin/opendoor suggests 'ATH1F' and 'ATH0F'.
>> # TRS-80 trs80(a)ucc.gu.uwa.edu.au #/ "Otherwise Bub here will do \
>> # UCC Wheel Member http://trs80.ucc.asn.au/ #| what squirrels do best |
>> [ "There's nobody getting rich writing ]| -- Collect and hide your |
>> [ software that I know of" -- Bill Gates, 1980 ]\ nuts." -- Acid Reflux #231 /
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