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1  Using Arduino / General Electronics / Re: Can't switch Reed Relay on: January 18, 2013, 10:27:25 am
hm, thought it should be right but the schematic seems to be the other way round than I thought. Now everything is working smiley

So the problem was:
1. Relay connected the wring way
2. pinMode to Output forgotten

Big thanks to all of you!
2  Using Arduino / General Electronics / Re: Can't switch Reed Relay on: January 18, 2013, 10:22:13 am
Ok, new findings smiley

If I connect the relay manually to 5V the relay doesn't switch but the whole Arduino gets switched off. So it seems to suck too much power?!
3  Using Arduino / General Electronics / Re: Can't switch Reed Relay on: January 18, 2013, 08:52:46 am
forgot it, fixed it, but still the relay doesn't switch.

Btw. the 3,3V output is not switching the relay. I have an Arduino UNO. There should be 5V at the digital outputs, right?
4  Using Arduino / General Electronics / Re: Can't switch Reed Relay on: January 18, 2013, 08:41:28 am
Yes, checked it, but what I notice is that the LED is much brighter if it's connected directly to 5V than if it's connected to the digital Output...
5  Using Arduino / General Electronics / Re: Can't switch Reed Relay on: January 18, 2013, 08:21:22 am
oh, that works. What could be the problem?
6  Using Arduino / General Electronics / Re: Can't switch Reed Relay on: January 18, 2013, 08:13:23 am
I think I connected it the right way.

Pin 2 ist connected to 2/13 of the relais and GND is connected to 6/9. Then I switch Pin 2 between low and high every second but nothing happens.



7  Using Arduino / General Electronics / Can't switch Reed Relay on: January 18, 2013, 04:08:13 am
Hi,
 
I want to switch the following relay TE JWD-107-5 (data sheet is attached) with an Arduino but the switch stays allways closed. Does the Arduino fail to deliver enough current to switch the relay? What could I do to fix it?

Best,
math
8  Using Arduino / General Electronics / Re: Which relay and how to connect on: January 13, 2013, 01:52:06 pm
any more help?  smiley-sweat
9  Using Arduino / General Electronics / Re: Which relay and how to connect on: January 09, 2013, 02:25:52 pm
Thank you Lefty for your comment.

Sorry for the mess. I'm very new to electronics. The upper ADC is not from an Arduino, but part of a different system which evaluates the NTC and I can't alter it. But it seems I got it wrong. The L,R,C parts should somehow be organized in order to filter the signal because the NTC is connected via a long wire smiley

I hope it is getting clearer why I want to use an optocoupler and a relay. It's because I can only connect to the system directly at the NTC and I want a galvanic separation of the arduino and the other system.
10  Using Arduino / General Electronics / Which relay and how to connect on: January 09, 2013, 08:26:56 am
Hi,

I have a circuit that evaluates a NTC thermistor. Now I want to add an optocoupler controlled by an PWM of an Arduino to have the opportunity to simulate some NTC values. I want to connect the optocoupler via a relay (or are there better solutions?) in order to have the possibility to switch between the real ntc and the optocoupler. And In the case that the Arduino has no power the NTC should be switched on.

My questions are:
What relay do I need and how do I have to connect it? It would be really helpful if you can name me a specific product :-)
Do I need any other parts?

Thank you very much

best,
math
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