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Topic: Arduino AC Power Shield! (Read 28 times) previous topic - next topic

ryanjmclaughlin

Hi All,

After some work I did with triacs and dimming, I have made a AC power shield!  It has 4 triac driven outputs, my current prototype can only handle about 1A per channel, but The final version I am hoping for 2.5A or more (300W).  It also includes a zero-cross detection circuit to be able to use an interrupt and dim AC devices. I have 2 or 3 prototypes for sale (will work fine for testing and simple use) for $25.  Please let me know if you are interested an have the time in the next week to test this and let me know if I should make any changes before I order a first production batch.  I am hoping to keep the price around $30.

The only problem I had with the prototype batch is the routing of the pins...  I am not sure if I should do a separate female header row (like the prototype shield) or find some long tail female headers to go through.  

Please let me know if you are interested in testing one of the prototypes (only charging to recoup some of my cost - I will make sure you get a big discount on the final version!).

http://picasaweb.google.com/lh/photo/7iQ0pX2SD8FITkhaYWesrg?authkey=Gv1sRgCKmvsNPa09u83AE&feat=directlink
http://picasaweb.google.com/lh/photo/Ftbgdp2FY0f2EkxjATcp6g?authkey=Gv1sRgCKmvsNPa09u83AE&feat=directlink
http://picasaweb.google.com/lh/photo/7JUzjbmLYT0cptQ-YmwgmA?authkey=Gv1sRgCKmvsNPa09u83AE&feat=directlink
http://picasaweb.google.com/lh/photo/SRG1O1kYR1qw0RmrRe2YXQ?authkey=Gv1sRgCKmvsNPa09u83AE&feat=directlink
http://picasaweb.google.com/lh/photo/I3srijjnzyYpC4Ix3vn8nQ?authkey=Gv1sRgCKmvsNPa09u83AE&feat=directlink


nkcelectronics

Hmmmm, this shield looks more dangerous than the DANGER shield.  With such number of electronics newbies out there, you need to add a HUGE disclaimer in the board, and start counting the number of casualties.

ryanjmclaughlin

Yes this is true!  There is a warning, although I may need to increase the text size!  All the HV contacts on the bottom are going to be covered...  liquid electrical tape, hot glue, something like that...  I will try to post some vids of it in action tonight.

madworm

I don't think that will be good enough.

Looking at all the traces, there is really no separation between 5V and the possibly fatal 120V part. And there's always the odd user that fiddles with the circuit and forgets to unplug the power. I know because I've done that when I thought I was 'in control' and was lucky a few times.

With all the opto couplers it should be possible to move the HV part to a different PCB, box it, and only have safe voltages on the shield. This lacks the coolness factor, but you surely don't want arduino users to end up on the 'darwin awards' list ?
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nkcelectronics


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