Strange problem with relay board
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Hello!
The ground is separate. Relay Board takes the ground from the 12V adapter, also Arduino and the Relay Board have their own ground not connected together.
Yes, I have a 4 uF capacitor on the radio. Do you think I need to increase the capacitor? Seems like powering on/off the relays (only the led connected to the IN[1-4], the relays itself are powered via AC 12V) are creating a kind of disturb....
If I can make some tests to give more informations, let me know ;)Thanks!
Simon@xefil Hi Simon, I would make sure that you have one common ground. You could try a larger capacitor as well. Also, maybe post which specific relay board you are using. Which power supply is connected to the Raw and Gnd pins on the Arduino?
Cheers
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Hello @Sparkman,
This is EXACTLY the board I'm using:I've seen it has only one ground pin which is connected to the external power supply.
So, the wires are connected as follow:Relay Board:
[IN1-4] -> Arduino digital PINS
[VCC] -> Arduino 5V
[JD-VCC] -> External power supply 12V (via 7805 to obtain 5V)
[GROUND] -> External power supply 12V groundThe Arduino is actually powered on via the FT232 adapter then via USB on a 1A power supply.
I've seen that, if I remove the JD-VCC the relays are not working as expected, but the leds on the relay board, that are showing if the relay is on/off are working correctly. I mean, if I dont give power to the JD-VCC the board is working well without issues. I can send then on/off via Openhab to the relays without problems. As soon I connect the JD-VCC and I use the same relay, it stops to work after one or two tries. Seems really that the relay, powering on, creates a disturb to the antenna that brings it to stop to work. I need to reset all and then it works again for one or two times.
Any suggestion?
Thanks, Simon
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@xefil said:
[IN1-4] -> Arduino digital PINS
[VCC] -> Arduino 5VHi. relay board need not be powered by Arduino, but from a separate power supply is 5 volts. if you eat more than 1 relay from Arduino he lacks the power to instruct the other relays, it affects his work.
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As I understand it is the radio which stops working. I had similar issues which in the end made me to move to solid state relays. A few possible causes : ESD caused by the coil in the relay (you can try to change the orientation of the relay with respect to the radio) ; powerline spikes (careful layout of ground wires: no loops, solid wire, isolated vcc's ; bad components ie : fake optoisolators on the relay board ; sensitive radio.
Happy debugging ;)
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Hello @vampircik and @AWI
Thanks for the replies!
I've ended adding a 220uF to the radio. This helps definetly to send the commands well. Then I've added this little hack to gain the range, posted somewhere in this forum as well:
https://www.youtube.com/watch?v=NpMnauHeR7YNow seems MORE stable. Well, it happens that turning on the first relay, the arduino reboots (takes 3 secs) and then all the other relays are working well, the first relay too. Maybe some spikes in power?
Simon
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Hello @Nuubi
Sorry, as written I'm not so proof with electronic but, on the other hand, as soon I get something to work, I'm happy like a kid with his new gift :)
BTW, what do you mean exactly? I should solder some capacitor between 5V and GND? Directly on the Arduino? Which size in case?Thanks a lot!
Simon
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Oh well, it can be actually extremely complicated. But, basically, add a larger cap + a small one together. Larger one acts as a power reservoir and smaller one filters high voltage spikes. Basically like that, as I understand the situation. Large ones are in the range of micro Fs, smaller ones nano Fs.
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I had the same problem a few months ago.
The problem solved powering the arduino from a different power supply.
You can read a bout it hereNo more problems since
