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ClemensValens
ClemensValens 4 hours ago
Not very big indeed (7.8x4x2cm). Have you ever tried one? If so, does it work well? Looks as if there is a camera inside.
Invisible Multi-Target Doorbell
TiemeKuyper
TiemeKuyper 1 day ago
Indeed for a 3-phase surrounding this circuit is not suitable. This is also not a very common implementation. I think the wisest to do then is to use the regular optocoupler implementation as normally used. The 3n3's give here also a phase shift which you don't want. The disadavantage of the standard optocoupler is that it needs a dissipating series resistor. I did a simulation with an optocoupler, and an exor at the output, which seems to be able to detect the both zero crossings. I am not able to test it here since our house only has 1 phase, but it should be able to do so. Will share the results later. Added the drawing how it should work. Please realize that I have not tested this.
Mains Power Driver by MCU DC or PWM
purple-bobby
purple-bobby 1 day ago
http://amzn.eu/emn9Aii  
Invisible Multi-Target Doorbell
ClemensValens
ClemensValens 1 day ago
This weekend I came across Ring2 which is pretty stylish & discreet, but the software seems to be biased to surveilance. Multi-target is not mentioned anywhere.
Invisible Multi-Target Doorbell
ClemensValens
ClemensValens 1 day ago
So far the following approaches have been proposed (in random order): use the pull-handle as a selector switch fake door panel is really OLED display micro touch keyboard projector in door handle speech recognition face recognition secret knock code QR code reader telephone entry system select target from scrolling list Ring2-like system Some are more practical than others. Other suggestions can be added. We can do a vote. Would anyone be interested in working on such a project? The objective would be a project article in Elektor Magazine. Elektor can pay for the parts & PCBs. We cannot pay the hours, but we pay an author's fee and royalties on the product's sales are possible too.
Invisible Multi-Target Doorbell