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by Pepepaco_82
Sat Jun 30, 2012 6:46 pm
Forum: HATs and other add-ons
Topic: how to sense 220v input -solved- I hope
Replies: 59
Views: 61757

Re: Playing with mains, how to sense 220v input -solved- I

I don't like the title of this thread. In my opinion, anybody who wants to work with mains and calls it 'playing' is obviously no suited to do so. Yes, probably the title should be only "How to sense a 220v input". But if I had known how to do it I don't have to open this thread... With the help of...
by Pepepaco_82
Fri Jun 29, 2012 8:16 am
Forum: HATs and other add-ons
Topic: how to sense 220v input -solved- I hope
Replies: 59
Views: 61757

Re: Playing with mains, how to sense 220v input -solved- I

Hi all, Many thanks for all your replies and help. I really appreciate it. So, what about add a fuse and a varistor to get some protection to the RPI? something like this: Circuito4.GIF I don't think it will add in any more protection - if mains get through the opto isolator then it's going to fry a...
by Pepepaco_82
Thu Jun 28, 2012 5:49 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C Port Extender
Replies: 3
Views: 3386

Re: I2C Port Extender

Looks really great, many thank for this open project I don't have my pi yet, and I'm not sure at all about witch i2c driver select to manage your board, or how to do it exactly. I gather reading forum the first step is recompile the kernel with the i2c driver, this method? http://elinux.org/Hammer_I...
by Pepepaco_82
Thu Jun 28, 2012 4:29 pm
Forum: HATs and other add-ons
Topic: how to sense 220v input -solved- I hope
Replies: 59
Views: 61757

Re: Playing with mains, how to sense 220v input -solved- I

Shure, this is the point to work as an alarm. The supply power for the RPI will be give by a SAI, and the optocupler look for a different one, the general power, to detect a possible power off.
by Pepepaco_82
Thu Jun 28, 2012 2:59 pm
Forum: HATs and other add-ons
Topic: how to sense 220v input -solved- I hope
Replies: 59
Views: 61757

Re: Playing with mains, how to sense 220v input -solved- I

Hi, first of all thanks for your fast reply and help. You're right, with my design I'm in the very low limit of the 4N25, and the only way to improve is wasting power on the resistor, that implies bigger and more expensive elements, a bad idea . Your suggestion is much better. I leave here the redes...
by Pepepaco_82
Thu Jun 28, 2012 11:24 am
Forum: HATs and other add-ons
Topic: how to sense 220v input -solved- I hope
Replies: 59
Views: 61757

how to sense 220v input -solved- I hope

Hi all The rpi has captured all my interest. And I like to get fun developing some hobby projects with it, I think that it have a enormous potential for a really low price. My first project would be a home alarm system, as long as I don't have my rpi yet (its comming, only 9 weeks more...) I begin p...

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