Questions tagged [relay]

A relay is a part that acts like a switch that can be controlled by an Arduino. They usually are powered by sending current through a coil, which moves a piece of metal to touch a contact within it. (Note there are also solid state relays which act more like a transistor.) The moving parts is why some devices make a "clicking" noise when they turn on/off a light or another device attached to it.

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98 views

Relay with NodeMCU is not working

I'm using a Relay Channel and NodeMCU(8266-WIFI). When i trigger the connection, LED Turns ON in Node MCU But the Relay connection is not working. I'm not sure what is the issue, Please help to fix it....
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530 views

Connect 5V relay to ESP32 WROVER B board

I need to use a ESP32 WROVER B based MCU board with a standard (cheap) one-channel 5V relay (e.g. to switch on a mains-power appliance). Attempted removal of excess solder around the headers ...
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1answer
69 views

Using MAX30100 SpO2 value to turn on LED

max30100 i2c sensor gives heartrate and spo2 reading in serial and also can show values in lcd display. I want to show it's indication via LED. If SpO2 value <94 , it will turn on Red led in ...
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2k views

Arduino Based Home Automation System

I am working on my project of home automation system using Arduino GSM SIM900 & four channel relay module. I am facing a problem in my code. Can any one help me on this, SMS is receiving but its ...
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1answer
2k views

Relay for controlling a water pump motor

I want to switch on and off a motor with arduino, used for pumping water. I need to have a idea which relay could be used with arduino. Here is a photo of a similar motor:
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What can be the maximum legth of data wires of relay which is connect to node mcu? [closed]

I am working on home automation and now I am installing it. I am giving my relay 5v supply separately but my node mcu and relay board are 20m far so my concern is will there be any problem if the data ...
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1answer
551 views

esp8266 + octocoupler relay: WDT reset when using AC current

I'm trying to switch on bulb via 4 channel 5V optocoupler relay controller from ESP8266 using WIFI Access point. All my connections looking fine and i can able to connect WIFI SoftAP and send signal ...
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When should I use a transistor, mosfet, and when should I use a relay?

I am used to relays some, and they are useful, especially for large loads like a incandescent light bulb or other 120V AC device. However, it seems like overkill to use a relay for a bunch of LEDs ...
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74 views

Control relays with ESP8226 WIFI module and Arduino Uno [closed]

I am new with Arduino and I am using an Arduino Uno, could someone help me make this code work or tell me what's wrong with it? I am trying to control relays with ESP8226 WIFI module and Arduino This ...
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2answers
81 views

Back EMF from Relay causing trigger on INPUT pin

I am wiring up a light show for my pickup truck. I have installed various high power spotlights and light bars into a dedicated relay/fuse box in the engine bay. These relays are wired into a switch ...
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2answers
160 views

Digital Input using a button doesn't work properly when using it to control a relay

I'm trying to control a relay both via Bluetooth and using a switch. The problem is that, when the LED is off, I can turn it on with the switch but then if I turn off the switch the relay will stay on....
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2answers
88 views

Digital pin output voltage fall down when driving a relay

I'm trying to trigger 8 different 5V relays using arduino atmega 2560. the relays (70Ohm coil) are powered by an external 5V source, and im trying to trigger them through a driving stage which ...
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2answers
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Normally-Open opto-coupler board

I'm looking for a Normally-Open optocoupler board for arduino. I need to control power of a device (DC 12v, 500mA). I tried to use TLP281 board, which works, except that it inverts the output: device ...
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104 views

Arduino Uno - Raspberry PI - Float Sensors - Water pumps

I am experimenting with Aquaponics and since I am a software developer I found it "smart" to use arduino/raspberry in order to control the water flow and not simply use a water pump with ...
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62 views

Eleminate noise from a Relay in ArduinoFFT

I have built a circuit with an Arduino Nano to measure frequency from my music, it's basically this schema but I changed the code a little bit to fit my needs. My problem is I want to add a Relay (I ...
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2answers
449 views

MCU to switch single coil latching relay not working (attempting array with common gnd)

I have several single coil latching relays, (EC2-5SNU). I am trying to control them by an MCU; connected directly they work fine, but I am iffy about keeping it this way so I'm trying to power them ...
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1answer
91 views

Error trying to simulate temperature dynamically

I'm trying to simulate dynamic temperature using a small set of data with ESP32. I've just realized that the relay doesn't change the status if there is some variation of the temperature upper or ...
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0answers
37 views

USB and LM7805 both to power Arduino

I have high current usage For my circuit as you can see below (link): I like to power Arduino when it is not connected to PC by USB Connection, So I want to add one external power supply and connect ...
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1answer
123 views

Reproduce simulated temperature data with Arduino

I'm starting a test using Arduino to reproduce a set of temperature values in water each three hours and need some help with it. I will use two ds18b20 sensors to control two thermostats connected to ...
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1answer
416 views

Switching a Solenoid Using Arduino's 5V Output?

I'm a bit stumped on how to switch on a solenoid using a transistor using my Arduino Nano's 5v Output. The solenoid runs on 12V, so I used an NPN transistor to connect the 12V source to the solenoid ...
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5answers
17k views

Reasons why it is not OK to connect a relay directly from an Arduino digital pin

After looking into various schematics on controlling a relay via an Arduino, I have noticed that, most of the time, transistors are used to switch the separate supply into the relay coil rather than ...
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2answers
78 views

2 way switch with Arduino?

Hey I'm working on a home automation system where I can replace one of my 2 way switches to an Arduino Or node MCU controlled one but I want to avoid normal relays because as of what I know they can ...
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1answer
136 views

NodeMCU vin pin(5v) is not working

I'm a newbie on Arduino and NodeMCU so now I'm trying to run my relay module trough the NodeMCU v3 and so far I have wired them all respectively as the instruction below: NodeMCU 5v Relay D2 + ...
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1answer
102 views

Digital pins are no longer outputting enough to click a relay

I've been working on a project for awhile now, and I ran into a problem a week ago I couldn't solve. I'm using an Arduino uno R3. My project involves the use of 4 relays triggered by the digital pins. ...
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1answer
40 views

NodeMCU and relay with VIN power

Have read a lot of different things online, and I just ain't sure yet. I'm trying to hook up a NodeMCU to control some relays. And want to power the NodeMCU by the VIN pin. Anyone know if this setup ...
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0answers
57 views

HC-05 bluetooth module short range

I have started learning about arduino and just bought a bluetooth module, HC-05. From where i bought, it says it has range of approx.10 meters. I made hc-05 connection with arduino in below described ...
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1answer
50 views

Arduino changing output based on wire voltage

I’m new to arduino and I want to build myself smart switch that can be turned of both manualy and via wifi, is there any way to change position of relay based on if another wire is live or not? Im ...
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1answer
44 views

Control DC motor in both directions with two relays

I am using an Arduino and two relays to control 12V DC motor. I need to rotate the motor in both directions. For the first trials it worked fine. Finally one next switching fried my Arduino. I think ...
2
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1answer
76 views

digitalRead() function of Arduino doesn't read Input value sent by sensor after detecting the object

I'm trying to turn ON the LED(inbuilt/PIN13) when photoelectric proximity sensor(12v) senses any object. Sensor is connected on pin 2. Assigned pin 2 as INPUT, I've got a 12v spdt relay for switching. ...
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1answer
48 views

How to close humidity sensor at specific humidity

I am using dht humidity and temperature sensor on arduino and i would like to add relay and buzzer on the system. What I would like to do is to close it via buzzer and on 65% humidity run buzzer. The ...
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1answer
58 views

Help with NodeMCU based smart switch

The project I'm planning is to use a NodeMCU at each electrical board in house to control lights and fans via relays. Each MCU will communicate via MQTT over WiFi to a Raspberry Pi 4 from where I can ...
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1answer
117 views

Driving 5V relay with ESP-01

I'm trying to drive a 5V relay with 3.3V ESP-01 with schematic below. I programmed the ESP to start a portal through which I can derive the relay by triggering GPIO-0 & GPIO-2. However when I ...
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0answers
129 views

I'm desperate and need help with MFRC522 (stops working randomly)

I've made a light switcher that switches lights on for 15s after a correct tag is presented, and also when door is opened for 6 seconds (its for outside) so i can see a keyhole after leaving for a ...
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0answers
25 views

error ph meter cant show the data [duplicate]

im using ph meter DFROBOT v1.0 at i compiled the code from the DFROBOT web this is the code * # This sample code is used to test the pH meter V1.0. # Editor : YouYou # Ver : 1.0 # Product: ...
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0answers
41 views

Peculiar relay behavior from POST

I am trying to toggle on/off between two separate HTTP request. One submit button to turn it on, and another separate submit button to turn it off. I expect the device to launch in the off/low 0V ...
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2answers
64 views

Turn on relay for amount of time by continuous input

I have a project having two input status first the input is not continuous the output buzzer relay will be on for 10 seconds and then turned off or it can be off directly by push button the second ...
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2answers
76 views

How to use a push button & transistor as a kickstarter for power supply?

My goal is to save energy, and I intend to do so by powering a chip with itself, and cut power whenever unnecessary. The best image I can have is of a startled monkey who jumps on the branch, screams ...
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1answer
192 views

Can i connect in pin of relay module to Analog pins of arduino instead of digital pin?

Im a complete beginner Im making a project using relay modules and arduino. but all the digital pins of my arduino are filled. I wanted to ask if i can use the analog pins to connect my relay module ...
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0answers
46 views

Can I Make a Radio Frequency Remote with Arduino

Im doing a project where i'm using arduino with a RF Receiver 433MHz. Where i press a button on a RF remote to make the lights or anything that i connect to the relay modules which in turn are ...
2
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1answer
538 views

Which relay module to buy and what is the difference between 1 channel and 2 channel relay boards

I wanted to d a simple circuit using Arduino to control the lights in my house. But i do not know which relay module to use my house runs on standard 220v ac. Can anyone tell me weather this relay ...
0
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1answer
67 views

how to stop the relay after it is getting on and let the sensor get the result

I want to provide a delay in the following iteration reading so that the sensor can read the condition after the pump starts. void loop() { //-------------Fungsi Read sensor----------- // ...
2
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1answer
56 views

Relays just switch ON and OFF on delay(), not on millis()

I use fuzzy logic for the running time of relays, but the relays just switch ON and OFF at the interval of the delay() I put at the end of loop. This is my code: void loop () { ph = -180/100.0; ...
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2answers
468 views

How to prevent flickering relay upon waking from deep sleep using ESP01 board?

I have a cheap ESP01 relay module and am using it with ESPEasy. I soldered the GPIO pin 16 to RST to allow deep sleep and that all works great. However when the unit wakes up the relay flickers quite ...
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1answer
60 views

Remove a sudden pulse on pin d3 of nodemcu when powering it up [duplicate]

I am using node mcu and a 2 channel relay connected to the motor via pin d3. When I power on the circuit, it shoots a pulse to the relay and i think it will damage the motor. Please suggest me how to ...
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2answers
126 views

controlling 2 sensor and 3 pump using millis

i make a 3 pump for output and im using millis for it, i want to stop if rach the intervalm now in my code its still looping not realy stop for it thx int pump1 = 5;//pin D5 int pump2 = 6;//pin D6 int ...
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1answer
44 views

DH11 and uno relay controle fridge

I want to control my bar fridge with temp sensor and relay, This is my first project with code, i copied this: https://robojax.com/learn/arduino/?vid=robojax-DHT22_11_TM1637_relay But I want some ...
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2answers
38 views

Module that can both detect Voltage (12V) and Control current [closed]

I need a module for ARDUINO that can both detect Voltage (12V) and Control current between 2 pins (12V), like a relay on another device I have found relay modules to control pins and another module ...
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1answer
58 views

How do I control a conveyor to start and stop in same location using optical rotary encoder

I am a complete novice at arduino. I just want to know if this is possible before I start investing in components. I need to start and stop a chain drive conveyor {can't slip} powered by a 12 volt ...
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2answers
103 views

Can I control solid state relay directly from arduino digital pin?

I want to switch on/off some AC device using solid state Omron G3MB relay I know that for magnetic relay there should be transistor and flyback diode, but what about SSR? Can I connect it directly to ...
3
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1answer
145 views

Ultrasonic Sensor(HC-SR04) recording random distance

I am am trying to make a code which automatically controls relay on basis of ultrasonic sensor measurements. I am using a nodeMCU as a microcontroller rather than an arduino. The relay and the ...

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