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Hi all, I have built the electronics based on this design, thanks Avandalen! I designed my own PCB (and got the thyristors backwards (D'OH)!) nevertheless it works wonderfully now. I'm using a cheap Chinese Arduino micropro as the controller, and I dropped out some of the transient protection devices as I felt they are unlikely to be needed...I'm gambling on that! Programming the Micropro is easy and cost me very little. I did have some problems with it though as the through holes vias are not that well made and I could not get it to trigger reliably. Soldering the wire both sides fixed that. By then I had added shottky diodes already so I left them in place.Ive yet to build the electrode holders, but I bought some 6mm spot welding electrodes from AliExpress, but they are a 5mm sha...see more »Hi all, I have built the electronics based on this design, thanks Avandalen! I designed my own PCB (and got the thyristors backwards (D'OH)!) nevertheless it works wonderfully now. I'm using a cheap Chinese Arduino micropro as the controller, and I dropped out some of the transient protection devices as I felt they are unlikely to be needed...I'm gambling on that! Programming the Micropro is easy and cost me very little. I did have some problems with it though as the through holes vias are not that well made and I could not get it to trigger reliably. Soldering the wire both sides fixed that. By then I had added shottky diodes already so I left them in place.Ive yet to build the electrode holders, but I bought some 6mm spot welding electrodes from AliExpress, but they are a 5mm shaft cut with a M6 thread, and that has caused me lots of grief.Anyhow, I did a recording of the output using a Powermonic PM35 power quality monitor with 3000A CT's, output shorted. Results attached. You can see the 50ms and 400ms pulses clearly at about 1100A RMS, and the impact on the supply voltage when operating as I was also measuring the 240VAC source voltage at the load. I could not record shorter pulses as the rise time is too slow for the PM35 to trigger a transient recording (the snubber works!).A test weld on a battery with 400ms pulse burned a hole, but I suspect thats my poor test electrode holder and I did not apply enough pressure.I like this design - it works well and teh control is easy to modify if needed. Kudos to the original author.
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Hiya, thx for the post, for what its worth my display has N/C on pin 9, and has 22 pins, so from pin 9 each display pin is increased by 1.. Pin 21 and 22 are backlight LED, Oh, and leg 3 of the Pot must be grounded.
Oh, another thing... theres a new version out :https://github.com/olikraus/u8glibAnd pin5 (rd) must be taken to Vcc for my T6863C
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hiya RichardS440, I have been waiting for comments from the community. I've seen several shields, and a few industrial modules. Besides that, the modules cost some $100+, so I've not been able to play. Hopefully they will come down in price soon. I wonder if one can repurpose the new Nokia 3310 as a modem for this purpose?Thx for reading!
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Hi neel912, have you found my other Instructables yet? https://www.instructables.com/id/Using-the-Sim900si...But there are others, so look around on Instructables.
Hi DilshanK, I suspect you are using a UNO with both the module and the PC serial port connected to th single hardware serial port. As far as I know, this does not work.I suggest that you look at SoftwareSerial or similar library and connect the module to that software created serial port. Hope that helps!
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