A relay is an electrically controlled switch. Electromechanical relays use an electromagnet to activate mechanical contacts, solid-state relays use semiconductor switches.
0
votes
0answers
21 views
Arduino - Solenoid Valves and Pumps Control (Relay Shield & Motor Drive Shields)
I’m trying to control two Diaphragm Pumps (12VDC/4.3W) and five Solenoid Valves (24VDC/10W) using Arduino Uno & Arduino Display Module.
I know there are many different ways to control these ...
1
vote
2answers
115 views
What is this relay symbol?
I have never seen a relay depicted as below:
from here (pdf)
Can someone explain what is going on for terminals 6, 7, and 8?
5
votes
1answer
115 views
Automotive Relays - What is the actual difference?
Or maybe my question should be 'do I really need one?'
I have a circuit where I am driving an SPDT relay with a PIC (and transistor). The relay is switching 12V and ~150 mA (it is switching the ...
0
votes
0answers
59 views
Is it safe to use a Relay to control my room lights with a microcontroller?
Firstly, I would just like to state that I'm a complete n00b to electrical engineering.
I'm thinking of controlling my room lights with a microcontroller.
The way I'm planning to do it is by placing ...
1
vote
2answers
60 views
Calculation of the latency of a relay
I have a SPST relay that I do not have the full datasheet for, but I wish to calculate the time it takes to switch on a current for a particular voltage. Is there any easy general way to do this? My ...
0
votes
0answers
25 views
LCA710 SSR vs. a “power transistor” for electric strike shield?
I am starting on a design for a new Arduino shield that will be used to trigger an electric door strike. My old design for this shield used a mechanical relay, mostly because I had one around at the ...
3
votes
1answer
108 views
Replacing a Wired Controller with an Arduino Uno: Relay Alternative
So, I have a simple robotic arm that has a wire controller you plugin into it. The controller has 8 pins. I haven't played with it too much but I know that the far ends are power sources and the ...
-3
votes
0answers
44 views
Books of electronic components [duplicate]
I'm looking for books that involve many electronic components like contactor, relays, asynchronous motor... and it will be better if it contains some exercises concerning those elements.
1
vote
1answer
49 views
Relay(or Alternative of relay) without pull-back feature
Generally relay triggers when current passes through its coil. When current stops flowing, moving terminal of relay is pulled back into the default situation. I need relay, once triggered, to remain ...
1
vote
1answer
76 views
Current draw in a battery contactor
In a battery continuous contactor used as a master switch, what limits the current draw through the coil once the contact is shut?
-6
votes
1answer
53 views
One plug active at time when four plugs connected to same ac supply [closed]
I need to connect four plugs on board to mains ac 230v supply but want only oned plug live when connected to supply and rest three isolated so that they r safe to touch or shockproof
2
votes
1answer
260 views
Mystery circuit: latching relay control with transitor / capacitor - why doesn't it work?
I've been looking for a way to control a latching relay with a microcontroller that doesn't quite have enough current on the output pins to operate it directly. I found this intriguing circuit using a ...
7
votes
3answers
14 views
How can I safely connect both Arduino and a 120V 10A circuit?
I'm building a thermostat, and the idea is to have it fire one of two 120V 10A circuits (one to heat, one to cool). I have two of these modules for the relay and I ...
0
votes
1answer
71 views
How to choose a relay for controlling a freezer/fridge with a uC?
I want to control a freezer using a microcontroller and relay, and be able to set a higher higher temperature for dry curing meats. I realize there are off-the-shelf solutions but I kind of want to ...
1
vote
2answers
68 views
Need help on Arduino and relay control
I am trying to get my Arduino to control a relay without luck. I'm able to see the LED flashing on the relay board indicating that the relay should be throwing, but the circuit is not being closed. ...
0
votes
1answer
38 views
What is the analog pin for on a Phidget 3051 Dual relay board?
I recently purchased a Phidget 3051_1 Dual Relay board with the intention of using it to switch on and off flourescent lamp ballasts (20W tubes) over a fish tank by connecting the relays to 110VAC and ...
0
votes
1answer
56 views
I think I am looking for a specific DC relay switch
I looking for a switch not sure what kind though.
let me explane:
I have 2 sources one creating DC 12v, 2 one creating around 6v DC
One source works for about 12 hours each day then stops
the other ...
0
votes
2answers
67 views
iCMOS analog switches and multiplexers
Does anyone have any experience with Analog Devices iCMOS high voltage analog switches or multiplexers like the ADG1434 or ADG1411?
The specs for iCMOS sound very impressive. But they've been ...
3
votes
4answers
222 views
Can an Arduino use a 12 V relay?
So I wanted to play around with relays and clearly got it wrong even before I got started. I wanted to control a 12 Volt fan - thinking that it would have a capacity of 12 V to control.. But now I ...
1
vote
1answer
64 views
Need a Relay For to reverse a thermostat
This should be a simple question for someone who knows what he's doing. Unfortunately, I don't, so I've been researching like crazy and am stuck on where to go from here.
I am trying to modify a mini ...
1
vote
2answers
116 views
What kind of Relay Reacts to Ohms?
I need to connect a relay to my old truck to turn on the "soon to add" electric fans.
The ECM has an engine coolant temperature sensor that uses the output resistance to determine coolant ...
0
votes
0answers
57 views
Safe approach for 120v power box w. 2x Dimmable outlets?
I'm looking to create a 4 outlet AC box (2 of which dimmable by arduino) and am intending the merge these two tutorials.
Although i'm not a certified electrician I do have experience with home ...
2
votes
2answers
60 views
Help with picking solid state relay
I am looking into a solid state relay to solve my problem here. I think I have found something that might work, but I am a little concerned as to weather it will work bidirectionally (I need DC ...
0
votes
1answer
67 views
Peristaltic pump
Can a peristaltic pump push air? Let's assume you have a 2m of tubing, and you pump a bunch of water through it. Can you remove the tube from the water reservoir so it is open to the air, and ...
3
votes
2answers
132 views
How can I break one circuit when another one's current draw is high?
A layperson here. I own a small RV park, as well has a nice large Motor Home. Most of my guests have the same set up in their Motor Homes as I do. The Microwave and the Hot Water Heater are on a ...
-2
votes
1answer
122 views
Home automation appliances wired to micro controller with wireless control from ipad/iphone [closed]
I'm currently going to start developing a media controller for my room. This microcontroller would be controlled wirelessly from my ipad.
so there's three parts to this, my ipad, simple ...
0
votes
2answers
293 views
How can I use transistors to work as an SPDT relay using the common pin as input and NC/NO as outputs?
PS: If you're impatient, you may skip to THE_POINT below:
Basically, this is for various lights in a car - indicators, park/rear light, brake light. I want to convert the simple output from ...
1
vote
1answer
110 views
Soft-Starter PWM Noise
I have developed a soft-starter for a project of mine. I am using an Arduino Uno to generate PWM to an OAC-5 relay that turns on and off the voltage across my bridge rectifier.
Here is a simple ...
2
votes
2answers
90 views
Does it exist: Latching Relay with Manual Switch
I'm looking for a latching relay (so I can control its state remotely) with a manual switch (preferably with a rocker style switch, so I can control its state locally).
Do these exist as I'm ...
1
vote
2answers
126 views
How to indicate a relay is activated?
I have a 12VDC automotive relay controlled by an open-collector NPN output on a remote device. I would like to be able to have an indication of when the relay is activated. I tried (and failed) the ...
1
vote
3answers
236 views
How do I control a two 12VDC 10A motors using an Arduino?
I am new to arduino and electronics in general but I need some help on a project I am working on. Essentially I want to be able to control the state (on/off) and direction of two linear actuators that ...
0
votes
1answer
85 views
How do I wire a relay board into existing series recepticles
I have a four channel relay, that I'm going to attempt to wire into a terminal block. I have experience with mains wiring and some experience with electronics, but no experience wiring relays. ...
6
votes
4answers
1k views
Shutdown Controller for Raspberry Pi in a car
Following on from my previous question I'm trying to create a shutdown controller for my Raspberry Pi. The Raspberry Pi needs to be powered from the battery, but should power-down after the Pi ...
5
votes
2answers
160 views
How to process voice commands using ATmega or Arduino?
For a project I need to start my PC using voice command. I thought to made up an voice controlled system to turn on my PC. As far as I know, when I press the turn on button-2 pin's on the motherboard ...
2
votes
2answers
237 views
How to Wire This Latching Relay
I am looking to switch a water solenoid valve using two water level switches, one will be placed at the top of a tank and will be NO (when water level is between full and empty) so that it will send a ...
0
votes
2answers
253 views
SainSmart 5V 4 Channel Relay momentary switch
Hey all i am wanting to hook this relay up here:
What i am wanting it to be hooked to (output) is the pwr and reset switch on a PC motherboard to act as a momentary switch:
I am also wanting to ...
1
vote
0answers
85 views
Lighting relay(?) with 220V leakage insensitive coil
Existing staircase lighting time-automat can not use 220V neon mini-bulb or LED lighted make-contact buttons. - These convenient buttons cause it t false-start (as if pressed) due to their ...
0
votes
1answer
64 views
Controlling a USB relay from LabView?
I am trying to control a SainSmart 4 channel 12VDC relay from Labview and having some trouble. I was hoping to control the module via serial comms but this does not seem to be working. Can anyone ...
1
vote
1answer
159 views
Use power line to communicate between devices - simple communication
So I am a google programmer getting interested in hardware hacking.
What I want to do:
Use Arduino or a similar microcontroller to control the lighting in my house, of course for as cheap as humanly ...
0
votes
1answer
114 views
Common VCC and multiple grounds
I need to plug a micro controller in device which seems to run a PSU with a common VCC and two "grounds"
A common 0V a -3.3V and a -5V. I want to add a 3.3V powered microcontroler (The easy part) and ...
2
votes
2answers
418 views
Wiring a SPDT Relay
I am new to Electronics and I am currently trying to wire up a SPDT Relay. I must admit I am totally confused. I want to have a SPDT switch that simply switches the relay over. Any pointers would be ...
-6
votes
1answer
110 views
Fried Arduino uno pins. yet I can blink led 13. anything plugged in does nothing [closed]
I don't really know what happened. I was using a 5 volt relay and now nothing works. I can upload sketches to it and blink led 13 but anything plugged into it does nothing. the 5volt and grounds don't ...
3
votes
2answers
208 views
How can i drive a 5v 120VAC 80mA with 15A contacts with a raspberry pi?
I don't have a very good knowledge of electrical engineering yet but I'm working on it. I will like to know as simple as possible, how can i drive a latching relay that needs about 70-90mA if the ...
2
votes
2answers
139 views
Controlling the Power of a Solenoid
I am trying to control the force of a solenoid. My current system has a bank of capacitors connected to a relay. In order to control the force (how hard I am trying to hit the object) I am increasing ...
5
votes
5answers
182 views
Relay Controlled Gain for Microcontroller
I'm thinking about controlling analog circuits with a micro controller and lots of tiny relays (Omron G6L). For signal routing this is fine but gain control is troubling.
Obviously I could do ...
6
votes
2answers
395 views
driving a relay with transistor and Opto-isolator
I am very new in electronics. I am controlling a relay with stm32 micro controller. For the isolation I have used a 4N33 opto-isolator. As my relay coil needs around 250 mA, I used a mps222 ...
-3
votes
1answer
114 views
Circuit to give +24VDC on applying 2V input [closed]
My system gives an output of
a) -48VDC under normal operating condition
b) -2VDC under alarm condition.
I want to make a single circuit using these two outputs such that
1) for case a ...
14
votes
4answers
490 views
Why are relays so frequently driven by optocouplers?
Since the advent of the many microcontroller development boards, like Arduino, there have been a number of relay modules sold to drive mains AC loads.
A lot of these seem to use an optocoupler, ...
0
votes
2answers
157 views
Will my relay operate with a 12V battery and simple switch?
If I have the following components:
12v Car Battery
12v 2amp relay
push button switch (normally open)
Can I simply just link all three components in series and expect the following:
The relay to ...
3
votes
2answers
960 views
Building a relay circuit for the Raspberry Pi
To start
I have only a cursory knowledge of electronics... I "know" what all the basic components do, but I have not figured out how to use that knowledge to design anything (much less evaluate ...
