Timeline for How can I get ultra clean dc wall power for my arduino project?
Current License: CC BY-SA 3.0
16 events
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| Apr 13, 2017 at 12:33 | history | edited | Community Bot |
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| Feb 5, 2017 at 11:05 | answer | added | ScotTinow | timeline score: 0 | |
| Apr 26, 2016 at 20:41 | history | edited | badweasel | CC BY-SA 3.0 |
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| Apr 24, 2016 at 9:20 | comment | added | frarugi87 | The two 100nF capacitors should be put one between 12V and ground and the other between 5V and ground. But.. Well, they should be already present in the circuit you bought. If adding them does not solve, try adding a big (e.g 1MOhm) resistor between ground and your earth plug at the wall instead of directly connecting them | |
| Apr 23, 2016 at 13:04 | history | tweeted | twitter.com/StackArduino/status/723860051279134722 | ||
| Apr 23, 2016 at 1:29 | comment | added | badweasel | Actually I think in my circuit I'll just be connecting to real ground. | |
| Apr 22, 2016 at 22:58 | comment | added | badweasel | @frarugi87 The new stabilizer didn't help. I also realized that I can power the whole thing (arduino and rfid reader) from 9-12v. With a 9v battery my range is optimal. With a 12v switched power adaptor direct I get very short range. If I then connect the ground of my circuit to the ground wire at the wall my range goes up again to closer to the 9v battery range (about 1-2cm shorter). I want to try the 2 100nF caps but where do I put them? In series between vcc and gnd? Or in parallel? Can you write this up as an answer? | |
| Apr 22, 2016 at 22:42 | history | edited | badweasel | CC BY-SA 3.0 |
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| Apr 22, 2016 at 11:04 | comment | added | badweasel | Yeah it essentially dropped the read range to nothing. Too much rf interference I suspect. Of course it's hard to tell what's happening when I can't see a console output. I do have it blinking out some return values as a type of "morse code". So I can tell that it's taking to the rfid reader and read that the measured antenna frequency is near 125khz. | |
| Apr 22, 2016 at 9:52 | comment | added | frarugi87 | Strange.. No reads at all? Did you check the ouitput voltage with a multimeter? Anyway your "new" board is a linear regulator, so use a 7V+ voltage source (12V should be fine) and be aware that you won't be able to draw much current from it.. | |
| Apr 21, 2016 at 21:29 | history | edited | badweasel | CC BY-SA 3.0 |
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| Apr 21, 2016 at 20:24 | comment | added | badweasel | I did experiment with the USB wall adaptor and got the same short read ranges. This is the regulator that I have today: robotshop.com/en/… I just tried that one with a 12v power supply and it won't read at all. And the only thing I'm changing in these experiments is the power source. I ordered this one which will be here tomorrow: amazon.com/SMAKN®-LM7805-3-Terminal-Voltage-Stabilizer/dp/… | |
| Apr 21, 2016 at 14:38 | answer | added | Bra1n | timeline score: 2 | |
| Apr 21, 2016 at 14:00 | comment | added | frarugi87 | You can't use a 5V regulator with a 5V adaptor.. You can experiment with 1) a USB wall adapter 2) a >7V wall adapter and a linear 5V regulator (e.g. 7805, with the two 100nF capacitors) 3) a >6V wall adapter and a switching step-down regulator, set to 5V 4) any wall adapter (maybe >3V) and a switching buck-boost regulator. I think that with the USB wall adapter you will already solve your problems, then I'd test a switching regulator (step downs are better, I think) and the last choice is a linear regulator. you can find switching regulator modules for a few dollars on ebay, if you need them | |
| Apr 21, 2016 at 12:04 | review | First posts | |||
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| Apr 21, 2016 at 12:02 | history | asked | badweasel | CC BY-SA 3.0 |