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Topic: Connecting SSR with Arduino (Read 4323 times) previous topic - next topic

sdewan64

Hi.I am working on a automation project.I now need to control a light with arduino.I bought this SSR(relay) : http://www.amazon.com/Amico-SSR-25DA-Temperature-Control-Solid/dp/B004HZN628/ref=sr_1_fkmr0_1?ie=UTF8&qid=1372841582&sr=8-1-fkmr0&keywords=futek+25+amp+ssr

Now after doing some research I get to know that the arduino won't supply enough to power the relay.So I want to connect a DC supply to the relay.Can anybody help me with the connection?How should I connect the relay on the arduino and also to DC supply?And how much volt should I supply to the relay?Thanks in advance.

I will be using an adaptor like this :

http://www.amazon.com/UNIVERSAL-ADAPTER-ADAPTOR-SONY-1000mA/dp/B001DT7BHM/ref=sr_1_1?ie=UTF8&qid=1372842533&sr=8-1&keywords=ac-dc+adaptor

as external supply to relay.

PaulS

Do you have a link to the product itself? The amazon link is nearly as useless as an ebay link.

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Now after doing some research I get to know that the arduino won't supply enough to power the relay.

How have you determined that? The amazon link doesn't say how much current is needed to activate the relay. Typically, the reason people choose SSRs is because the current needed IS low enough to be triggered by an Arduino.

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So I want to connect a DC supply to the relay.

You need a transistor. The power supply is turned on and off by the transistor, which is turned on and off by the Arduino. Almost any transistor will work.

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How should I connect the relay on the arduino and also to DC supply?

The relay would not be connected to the Arduino at all.

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And how much volt should I supply to the relay?

Anywhere between 3 and 24 volts, according to the link.

sdewan64

First of all Thanks for you kind reply.

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Do you have a link to the product itself? The amazon link is nearly as useless as an ebay link.

I have actually bought this : http://ecx.images-amazon.com/images/I/417vEsAk-aL._SX385_.jpg
FUTEK 25DA.

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You need a transistor. The power supply is turned on and off by the transistor, which is turned on and off by the Arduino. Almost any transistor will work.


Can you please help me with some diagram of wiring.Should I put a transistor in between arduino pin and 3rd or 4th pin of relay?If yes then with which pin 3rd or 4th?

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The relay would not be connected to the Arduino at all.

Then how would I control the relay with arduino?

Thanks again and sorry for noobish questions.
Regards.

PaulS

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I have actually bought this

A picture is even less useful. The data sheet for the SSR will tell you the amount of current required to trigger the relay. We need to see a link to the data sheet.

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Can you please help me with some diagram of wiring.

Have you googled what a transistor is, and how it works. There certainly should be enough information available to help you figure out how to wire the transistor, power supply, and relay IF you need a transistor.

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Then how would I control the relay with arduino?

The same way you control the lights in your room. You turn the switch on or off. The transistor is the switch. It is turned on or off by applying current to the appropriate pin.

craigcurtin


Hi.I am working on a automation project.I now need to control a light with arduino.I bought this SSR(relay) : http://www.amazon.com/Amico-SSR-25DA-Temperature-Control-Solid/dp/B004HZN628/ref=sr_1_fkmr0_1?ie=UTF8&qid=1372841582&sr=8-1-fkmr0&keywords=futek+25+amp+ssr

Now after doing some research I get to know that the arduino won't supply enough to power the relay.So I want to connect a DC supply to the relay.Can anybody help me with the connection?How should I connect the relay on the arduino and also to DC supply?And how much volt should I supply to the relay?Thanks in advance.

I will be using an adaptor like this :

http://www.amazon.com/UNIVERSAL-ADAPTER-ADAPTOR-SONY-1000mA/dp/B001DT7BHM/ref=sr_1_1?ie=UTF8&qid=1372842533&sr=8-1&keywords=ac-dc+adaptor

as external supply to relay.


You need to find the spec sheet to be sure - but usually for all of these pin 3 is Arduino +5v and pin 4 is Arduino Gnd

These are all usually knock offs of genuine name brand units - and as such i would never drive one any more than about 1/2 it rated rating i.e. 25amp i would only use for about a 12 amp max load.

Craig

retrolefty

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Now after doing some research I get to know that the arduino won't supply enough to power the relay.


Well your haven't shown what research you are basing that assumption on. If indeed you have the SSR shown in the picture you posted ( http://ecx.images-amazon.com/images/I/417vEsAk-aL._SX385_.jpg ) you should have no problem driving that SSR input with a direct connection to an arduino output pin. Those types of SSR that state a DC voltage range input are driving an internal led opto-isolator and have an internal current limiting resistor of a value such that any input voltage in the 3-32vdc will limit current to insure it will turn on at 3vdc and also not burn out the led if 32vdc is applied. A real datasheet for the specific LED would allow you to determine the actual current value if driven with a +5vdc output pin, but I have little doubt that it will be within the output pin's safe current capacity. Perhaps you are not wiring it to the output pin correctly or have a software setup problem with the pin.  Posting your sketch might help determine the latter and a posted picture of your wiring the former.

Lefty

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