Questions tagged [relay]
Electrical device which, when energised by a small electrical current (low-power, control circuit), safely switches a larger electrical current (controlled circuit).
235
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Safest way for a 220V relay
I need to turn on and off a very power-hungry appliance using my Raspberry Pi.
I know a lot about software, and next to nothing about electronics and hardware. I looked around, and I saw a few rather ...
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1
answer
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5 Volt Relay not working as expected
I'm using a rasperi pi 4 and want to run a water pump with it. Connecting the water pump directly to the rasperi pi (ground and 5 V) is working. But I want to be able to control the pump via GPIO and ...
0
votes
1
answer
55
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My relay triggers on access. How to disable this?
Is "normally" open relay opened on 0V or 5V?
Here it is written that yes. But here it is written that no.
What is the truth?
Experimentally I see, that my relay module LED lights ON and &...
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0
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1
answer
38
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Pico providing power to PIR sensor and relay module from gpio pins
I am trying to power (not at the same time) a pir sensor, and a relay board, via pico's gpio pins. The project is a camera that is turned on when the sensor is triggered. I am using the relay board to ...
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1
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What's the best to control a motorized valve: 2 or 3 wires command?
I need to control a bi-stable motorized valve. I hesitate between two types of wiring:
Inverse polarity of 2 wires to open or close: I can do it with two coupled relays. Does it hurt to do it with ...
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1
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77
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Solid State Relay only turning on once
My 12v DC motor is only turning on once then off forever. It should turn on and off in the loop indefinitely. What am I doing wrong?
I have a simple circuit...
Parts:
Raspberry Pi 4 (fully updated ...
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2
answers
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Connecting my raspberry pi to latching relay
I am struggling with the same latching relay featured here:
Command/control latching relay using gpio pin only
Edit: somehow there's been confusion, I'm trying to activate this, the latching relay ...
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1
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78
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Drive a 24V relay with RPI3 B+
I need the RPI3 B+ GPIO to drive a 24V relay that turns on an AC resistive load.
Update:I hope the block diagram I attached earlier is now showing.
part numbers listed, but the mosfet is not working ...
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1
answer
36
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Increase GPIO Voltage
I need to dock the 12V relay when giving the command via software, however, the GPIO provides only 3.3V not being enough to arm the relay.
My idea is to use a voltage booster (Step-up Mt3608) to raise ...
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1
answer
82
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Raspberry PI GPIO protection
I'm designing a PCB to mount and interact with a raspberry pi4. One of the things I need it to do is drive a 24V relay. This circuit has worked great with some controllers I've used where the outputs ...
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Unable to trip Relay with Raspberry Pi 3+
I am trying to utilize my RPi 3+ to trip a SPDT Bosch Automotive 12VDC relay in order to activate chicken water heaters when temp below 34 degrees. The program code works well on other, non relay ...
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First steps into controllers and circuits (NOOB ALERT). Why does relay module works only if connected to 5v pin but not with external 5V source?
As title states, I am taking my first steps into electric circuits and microcontrollers, so I apologize in advance if my question is not clear or does not make much sense.
I am trying to control ...
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1
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73
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connect an digital gpio output to a digital gpio input
I want to use a GPIO-out to talk to a GPIO-in... two different programs running on the same pi.
The program with the GPIO-in can be activated by either a button, or the other program... with the GPIO-...
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0
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GPIO change state record
I'm looking for a way to record Datetime and state of GPIO, but just want a record when the state change.
I have this in my code:
temp_def = 30.0
while True:
print(read_temp())
if(read_temp() &...
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2
answers
49
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Raspberry Pi 4 GPIOs are constantly on, even after restarting and cleaning up GPIOs
So, I got a Raspberry Pi 4 Model B, and I'm trying to make a project using relay boards.
Turns out, when I turn on my Pi, one of the pins is already active and the indicator turned on partially. I ...
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1
answer
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Relay provides power contineously
I have set up a Pi-Zero which controls several relay switches.
The Schematic is positioned below.
import time
import board
import busio
import digitalio
from board import *
from datetime import date
...
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0
answers
59
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GPIO output high not turning of relay
I am trying to turn a relay on and off using a python script.
The below script is realy simpel, turn the relay on and after 5 seconds turn it off.
The thing is, it dooesn't turn off. i thought it did ...
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votes
1
answer
168
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Wiegand wiring guidance on Pi 4 with voltage step-down
Ok so following on from my previous post here. I have decided to start with the Wiegand wiring interface. I've drawn a diagram below to illustrate how I plan to wire everything up. Would appreciate if ...
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2
answers
83
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Relay no longer works on GPIO ports
I'm french excuse me for my english language, i works on a industrial vision processing device. I use the following components :
Picaméra
Raspberry Pi 3B +
Relay : SRD-05VDC-SL-C
I work on a python ...
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-1
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1
answer
152
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16 module relay board connection to RPi Zero W
I am using raspberry pi zero W for a home automation project. I am using 5V 16 channel relay board and using all the 16 relays as part of the project. I have not connected a separate 5V power supply ...
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0
answers
35
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SSR or Opto-Coupler relay only works if shorted
I have a SSR 4 channel relay and an Opto-Coupler one channel relay. Both where specified to work on 3.3V signals. I wrote a quick test program on my raspberrypi zero w and tried both relays with my ...
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1
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910
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Sainsmart 12V, 16 Channel relay module connected to RpiZW has unwanted triggering when booting
I'm trying to get the hydrosys4 open source irrigation control software to work with my 16 channel relay board and raspberry pi zero w.
When the pi boots up the relay is triggered multiple times, ...
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1
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31
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Need script to make scheduled 8 channel relay outputs [closed]
This script fires my relays, but I don't know how to change duration and need it to fire daily to run pump and ozonator for an iso float tank. I'm currently only using GPIO 9 and 10
#!/usr/bin/python
...
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3
answers
566
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12v 4 channel relay pinout and explanation
I am kind of dipping my toe in this lake. Not a hardware/electronics person, more of a software guy (programmer). I am not able to easily find information about the 12V 4 Channel Relay (duinotech).
I ...
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5
answers
871
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Raspberry Pi , RFID , Relay Module and Magnetic Door
I have used the code from github and in that code i am implementing the raspberry pi and the RFID and relay module with magnetic door unlock. Everything is working Okay , the RFID , the Relay module ...
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1
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988
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How to control raspberry pi 4 GPIO pins by running android application in the rpi and in mobile?
I am trying to build a project based on IoT. My goal is to trigger relays connected to GPIO pins in rpi4 by using an android application running in rpi4 itself which can be accessed with an official ...
0
votes
1
answer
76
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Use Pi to control power to usb-connected device
I have a digital microscope connected to my pi (usb) that you can use in a browser with a java web app that I have written. The microscope is also powered through the usb. There is no on or off switch,...
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2
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149
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Do I need additional protection when using a 5V relay module with the raspberry Pi?
Noob here, I have purchased a relay module (see pic below), and was wondering if I needed to add any other protection components to the Pi. Through my limited research, I found that using a diode, ...
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42
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3.3v Relay switches on/off/on - off fails 2nd switch off
This 3.3v .relay, link to the the >>> Datasheet
As the title mentions works fine until I try to switch it off the second time round,
I see the red LED turning on (it looks a touch dim)
...
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2
answers
836
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5V Relay only works if VCC is 3.3V
I am very new to all of this, so please excuse if this is a very basic question.
I am trying to power a tiny water pump with my raspberry pi. For that I need the 3.3V or 5V output, because the GPIO ...
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votes
2
answers
323
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RPi 3 B+, set defaults for GPIO pins on boot and shutdown
I am using Raspberry Pi 3 B+ with
Linux raspberrypi 5.4.83-v7+ #1379 SMP Mon Dec 14 13:08:57 GMT 2020 armv7l GNU/Linux
to control a set of relays. I set:
gpio mode 7 output
gpio mode 0 output
gpio ...
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vote
2
answers
535
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Using Relays to Power off then Cut power to Pi Zero
I have a raspberry pi zero that I am running off a battery for remote logging reasons.
There is a low battery shut off module I have connected to the battery in case the battery gets below a certain ...
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2
answers
200
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How to detect if an external Relay is ON or OFF
I want to know the state of an external Relay connected to my Raspberry-Pi. Basically if there is current flow or not in A-B. A-B should be connected to R-Pi.
I am not sure how to proceed even though ...
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2
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39
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How to drive two 3v relays safely from Raspberry PI?
I use PI 4 to power two 3v relays. One is controlling 5v dc, another 12v dc. And about once a minute I am switching each relay signal state to On/Off
So each relay is connected to 3v pin, ground pin ...
0
votes
1
answer
501
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Using GPIO to control 5v relay module not working
so this is my first time trying to use a Raspberry pi and I wanted to automate a motor using a 5v relay module. I'm using a Raspberry Pi Zero W. I am using a 5v 2amp power supply to power the ...
1
vote
4
answers
2k
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Using single 5V relay module (jqc-3ff-s-z) - Asking for help
I have a developer background missing the electronics background. I read some threads with great interest:
Using single 5V relay (jqc-3ff-s-z) - safety advice required
and
5V relay (jqc-3ff-s-z)
I ...
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0
answers
54
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Raspberry PI and 8 module relay board
I have a raspberry pi 2 and an 8 module relay board (http://nettop.gr/index.php/en/hlektronika/relay/8-channel-5v-relay-module-with-light-coupling-5v.html).
Between the relay board and the raspberry I ...
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1
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48
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DockerPi relay is wired backwards from others?
First off, apologies if I should have posted this elsewhere (such as under general electronics, etc.)
I have two relays (JBTek, DockerPi relay hat) I have been experimenting with to control input ...
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1
answer
3k
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Can you use a 5V Relay Module with the Pi?
Can you use a 5V Relay Module or similar with the Pi?
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Wiring 12V 5 pin relay (without a module/board) for usage with Raspberry Pi
I'm trying to setup an automated garden as a quarantine project for my mother and I can't really figure out how to properly wire a 12V 5-pin relay module as every tutorial online only shows the ones ...
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0
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relay switch switches ON but never switches OFF [closed]
I connected my FL-3FF-S-Z two channel relay board to my Raspberry Pi 3, with gpio 0 and gpio 1 (numbers are from to $ gpio readall).
Following some guide, as GPIO generates only 3.3v I have removed ...
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1
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479
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Relay Active HIGH
I am building an irrigation system, and to make it short, I need to decouple the electric-valve to the Raspberry.
I am so using the following relay.
It works fine, but it is active LOW, for my use ...
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1
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608
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5V Relay module working but LED not turning on - How to wire? [closed]
I'm trying to control a relay from Raspberry Pi that will switch an LED on/off.
The relay is working (lightning up and clicking), but the LED doesn't turn on.
Here is how I wired everything:
VCC - 5V
...
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1
answer
74
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Raspberry Pi - Activate relay by phone [closed]
I'd like to set up a system to control a relay via land line. My goal is to somehow run a landline to the Raspberry Pi unit and have it trip a relay when the number is called and a DTMF sequence is ...
0
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1
answer
35
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using 2 pins to power the same relay
I have relay that requires 20mA to operate, which is a bit more than the pi can give from one pin. I as wondering if t was safe to connect 2 GPIO pins together to power the relay. I would use a diode ...
user121626
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2
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666
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How I can control an AC 220v with a relay and a Raspberry Pi 3B [closed]
I'm a newbie in this topics. I love electronics and I love the power of the boards like Raspberry Pi and I want to learn to use it by myself learning in internet, but I have a lot of lacks of ...
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2
answers
359
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Problems with the rpi zero and relay [closed]
I Have a problem...
(above the relay-coil Datasheet)
I want to control a single relay with my pi zero, but it seems that it doesn't have enough power.
the 3.3V pin of the rpi (measured to 3.19V) works ...
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2
answers
1k
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How to turn off relay when RPi shuts down
I have connected a relay to BCM 14 and by setting its output to HIGH I can turn it on, making a 220V bulb to turn on.
I use for that the following python instructions:
GPIO.setmode(GPIO.BCM)
GPIO....
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votes
3
answers
906
views
How can Rpi python control a 5V relay module, opto-isolated, with a JDVcc jumper? [closed]
Just starting to explore python, Raspberry and a relay. I want to control my 2-channel relay with a button. This is my test code:
import RPi.GPIO as GPIO
import time
import requests
from datetime ...
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0
votes
0
answers
44
views
Relay is behaving differently from tutorial
Given:
Raspberry Pi3
Sunfounder 2 channel relay
plugged into 3.3v
plugged into ground
plugged into pin 18
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
GPIO.setup(18, GPIO.OUT)
GPIO....
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