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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54 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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Is it possible that a 12V transformer is creating EM interference that's coupling onto a long antenna cable?

I have an Arduino Mega, Adafruit RFM96W 433MHz LoRa Transceiver Breakout and 2 Channel OptoCoupler Relay Module. https://www.adafruit.com/product/3073 https://www.amazon.co.uk/SUNFOUNDER-2-Channel-...
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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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27 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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81 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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relay not working

i tested 6 and none work. #include "Wire.h" #include "LCD.h" #include "LiquidCrystal_I2C.h" #include <Keypad.h> #define A0 A0 #define A1 A1 #define A2 A2 #...
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76 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
44 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
35 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 ...
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My motor works for a while but then stops

I have a simple motor automatization system. It only uses adapter, arduino, relay and motor nothing else. It works for 15 seconds and stops for 3 seconds. It works properly for 1 minute but then stops ...
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1answer
63 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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47 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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46 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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99 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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1answer
53 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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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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38 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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57 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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62 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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What Kind of relay module to use if i want to turn on or off high voltage appliances like AC? [closed]

What kind of relay module to use if i want to turn on or off my AC (which is a 1.5 ton bluestar) using arduino. Like we use a 5v relay for small appliances like fan and lights, what to use if i want ...
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27 views

Relay module works reverse [closed]

16 channel Relay module led is ON when pin is LOW and OFF when pin is HIGH, how to reverse that? Could you please help me
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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 ...
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93 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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1answer
306 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 ...
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65 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----------- // ...
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1answer
53 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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1answer
53 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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113 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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34 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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2answers
303 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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2answers
77 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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59 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 ...
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1answer
99 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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1answer
47 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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1answer
126 views

Detect 2 wire thermostat output

I have a 2 wire thermostat. R is +24VAC, W is Heater. I have no Ground wire (C), and I cannot open the thermostat. When the heater goes on, the thermostat internal relay gets powered and connects R ...
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55 views

XH-M131 Photoresistor Relay Module NC position

I have purchased XH-M131 Photoresistor Relay Module to automatically light my outdoor yard at sunset and turn it off at sunrise. I'ts working as it is supposed to, However, if I power off the relay, ...
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1answer
48 views

Relay starts trigger about 6 times when connecting arduino to laptop

I have a fairly simple code to turn a relay on-off every 2 seconds When i attach the USB of the arduino Uno to the laptop, it goes into a frenzy and the relay triggers on off for 6 times within 3-4 ...
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1answer
34 views

Sequencing air pistons proble - Help please?

I am a beginner trying to activate 2 sets of 3 air pistons sequentially by going through the YouTube Tutorials... Help, please, pretty please?? :-) There are 3 sets of 2 pistons, each set working in ...
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0answers
148 views

Unable to hear the click sound from the relay [closed]

I am using a 5v 2 channel relay module with arduino nano to turn on and off using RTC. I am able to see the LED on the relay turn on but unable to hear the click sound and the relay does not turn my ...
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2answers
329 views

What is the proper wiring for relay module?

I want to know the recommended wiring for relay. I am setting it up as NO. Where should I connect the relay, the hot wire or the ground wire? Where should I connect the wire going to bulb, NO or C ...
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1answer
64 views

Most Efficient & Cost Effective Home Automation Setup

I managed to build a system using Wemos D1 R1 connected to my website to retrieve data to power on or off a 5V relay. Now I would like to expand the project to control all my house outlet. Assuming I ...
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2answers
777 views

Controling 5V relay with Wemos D1 R1

I would like to control a 5V relay with Wemos D1 R1 module through webserver. I'm using the following modules: Tongling 5vdc Relay Wemos D1 R1 I'm using the following schematic: and here is the ...
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1answer
270 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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34 views

What would you change to make this circuit safer and more efficient?

I have a 24v battery bank and need to power a 24v pump for a duck pond. In my existing setup, I have a submersible pump with, effectively, a 100% duty cycle but this pump is not submersible and while ...
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1answer
70 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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2answers
311 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
70 views

Relay + Arduino uses too much power for battery to handle. Which solution is best?

You can see in my crumby schematic that I am using a Non-latching relay to turn on a 3A circuit (one of them arc lighters), which is powered by a 25C (supposedly) lipo battery. That same battery also ...
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1answer
76 views

Connecting a time on/off circuit and my adafruit neopixel light strip

I'm new to programming and hardware so be gentle. I've used this tutorial https://www.instructables.com/id/Arduino-Ultra-Mega-Timers/ to create a time on/off circuit. I'm attempting to connect some ...
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1answer
84 views

EMI resets atmega on switching ON relay with inductive load like a 230v fan

I am making an automation device. I am using an atmega8a to control 6 relays. The setup is standard, 220v load, 5v dc coil, flyback diode and an NPN transistor to trigger with atmega pin. The problem ...
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1answer
44 views

Using Arduino to control a high voltage DC device

I am an amateur hobby electronics enthusiast , and given the situation , I too am trying to make a contactless hand Sanitizing system like everyone else. My project requires a 36V DC solenoid valve to ...

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