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- Sun Aug 19, 2012 12:30 pm
- Forum: Automation, sensing and robotics
- Topic: Burglar alarm / iPhone alerts from RPi
- Replies: 16
- Views: 23272
1: Siren outputs. This is a 4 ohm speaker output. (I measured about 1vdc coming off of it while it was ringing This won't be any good as a general output, it will be an AC output from a speaker driver IC. 2: there is an unused terminal labeled "bell" this is 13.8vdc @ 1amp when there is a...