Questions tagged [switch]

In electrical engineering, a switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another

29 questions with no upvoted or accepted answers
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Do you actually NEED external resistors for switch connecting IO pin to ground?

Years ago, I encountered a fairly long debate at AVRfreaks.net about whether or not it's OK to directly connect AVR pins that are configured as inputs with internal pullup enabled directly to ground ...
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59 views

Single LED controlled by two pushbuttons - one of which acts like a toggle switch

Trying to control this LED with those 2 pushbuttons - one button that starts a short flashing sequence, another pushbutton acts like a toggle switch, one press bulb is on, another press bulb is off. ...
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0answers
83 views

Turning on controller with button and turning off with a timeout

I am making a device controlled by an ESP 8266 and am wanting to save power by having it power down when not in use. The desired behavior is for a momentary button press or vibration sensor activation ...
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102 views

How can I get the count of pulses of two encoders on the serial monitor?

I have two encoders; I connected them to pin 2 and 3 and I want to count the pulses of them to make two DC motors to work until it reaches a specified number of pulses, than stop working. I have ...
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2answers
166 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
273 views

Write a condition to execute 2 switch-case functions?

I'm new to programming and using Arduino products, and was wondering if someone wouldn't mind assisting me with a project I'm trying to tackle? If you review my code below, I have 3 conditions within ...
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0answers
930 views

Switch on/off LED 24V using a MOSFET

I try to switch on/off IKEA Ledberg LEDs which are powered with 24 V using the setup from this tutorial video: https://www.youtube.com/watch?v=sVyi7yWuXxs I use a IRLB8721PBF MOSFET. When I switch ...
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611 views

Difficulty connecting arduino ethernet with PC using a switch

Facing difficulty connecting arduino ethernet(w5100) with PC using a switch (Dlink). When both are connected directly(p2p) using ethernet cable, arduino device can be pinged. However, when connected ...
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0answers
367 views

How to recreate this basic ALPS switch board in Arduino?

I want to recreate this existing ALPS switch board (the board on the left) in Arduino, so I can control the switches (and 3 memory + 1 menu buttons) from my laptop. The ALPS switch board connects to a ...
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0answers
279 views

Adding a kill switch for servos with states - blink without delay code

I have many LEDs and two servos connected to one Arduino Uno, and the servos are programmed to move randomly indefinitely. However, I would like to install a kill switch for the servos by reading a ...
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26 views

how to control switch (proteus) using bluetooth card (HC-05) and arduino?

This is the first time I use the Internet with the Arduino in the proteus , What are the stages that I must follow in order to be able to control the switch via Bluetooth? If it was possible to ...
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0answers
67 views

What is the best way to replace the buttons inside a car remote chip so that it can be controlled via Arduino?

I have a car remote that looks like the following I would like to replace the buttons with some sort of switch or relay that can be programmatically controlled via an arduino unit. Would a simple ...
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42 views

default in switch doesn't appear to execute

I have a situation where the default case in my switch statement doesn't appear to execute as expected. I wonder if there is some subtlety I'm missing here? Given the following enum: enum ...
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33 views

ESP8266 connected to a HIGH pin and DPDT only works sometimes. Works everytime if connected to 3V3 pin

I have a Wemos D1 Mini hooked up to a DS2Y-S-DC3V DPDT switch. When I have the coil ends are hooked up to a pin (D2) and ground, it will click when I set the pin HIGH. It should click again when it ...
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136 views

Made a light controller for the holidays

I am a new the world of Arduino. I found on YouTube, how to build a light controller (https://www.youtube.com/watch?v=WvG9c84ApFA&t=39s). I follow every step but it doesn't work. Here are some ...
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1k views

Nested "switch" statements menu

I know that menus were discussed perhaps a thousand times here and everywhere. But using a ready solution is not something that I'm looking for because I know I won't learn the concept if I use them. ...
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0answers
691 views

limit switch and external interrupt

The INT0 pin of a custom Arduino-like board based on Atmega16 is configured in INPUT_PULLUP mode and connected to a N.O contact of a limit switch, the other end of the switch is connected to GND. in ...
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1answer
80 views

Driving higher loads with PWM

My Arduino Pro Micro can source 500mA from 3.3V VCC, when it is USB powered. The chip itself, is rated for 200mA, though, and its output pins for 20mA recommended, 40mA max. I am looking to have 3 PWM ...
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1answer
75 views

Float switch is not detected

Good day everyone, forgive me for the shabby drawing I am just panicking, why my float switches are suddenly undetected by my Arduino mega. I've tested all the float switches one by one to confirm if ...
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1answer
48 views

Recommend an Arduino Uno shield to monitor the state of 5 DPDT electrical switches

I have a project where I need to monitor the state of 5 DPDT electrical switches with Arduino Uno. Also, the Arduino board will be measuring the output from 3 thermocouples on 3 of the analogue pins ...
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1answer
2k views

Arduino DC motor with 2 buttons

I have a problem with my Arduino project and I tried everything to fix it but nothing helps. I am trying to rotate my DC motor with two buttons: one button is to stop/start rotating on left side, ...
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1answer
608 views

Timer for Control Motor using Limit Switch

Im not good in arduino, but I have project that control motor using limit switch. The rule is: When switch OFF, motor ON When switch ON, motor OFF for 1 hour (i dont want use delay because cannot ...
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1answer
43 views

Switching 4.2V circuit with 3.3V Arduino GPIO

I am trying to learn about MOSFETs and see this p channel MOSFET and this tutorial. I am trying to use a 3.3V arduino GPIO pin to control a load that is powered from a 4.2V battery in much the same ...
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1answer
2k views

TinkerCAD switch seems to be not working (always closed)

I am using TinkerCAD to simulate the functionality of a slide switch. Please comment if you think this question is off-topic. /* LiquidCrystal Library - Hello World Demonstrates the use a 16x2 ...
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1answer
2k views

Using an NPN transistor as a switch to turn on/off a DC Motor

I am trying to control a 3V DC motor (FA-130) with my Arduino Uno, and am trying to do that using an NPN transistor (2N3904) as a switch, as shown in this diagram. I used the Blink example and ...
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1answer
84 views

Sketch starts and keeps counting on external power supply but not usb

Thank you for the add, total newbie here (electronics and arduino) on his first project. Trying to make a counter for a hay baler with two HAL effect sensors, (pin 5 & 6) and outputting to an I2C ...
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1answer
107 views

Button Switch arduino

I'm trying to use my button as a switch (the led goes on after I push the button and the led goes off when I push the button again). I know I have the right circuit, because I also used a code from ...
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2answers
1k views

Using Arduino or ESP8266 as a switch to turn on a 12V DC Fan

I am new to the community and this is my first question. Hope it turns out to be a nice question :) Me and my friend are preparing a senior design project on home automation. I have several things in ...
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1answer
189 views

How to control RC power switch with Arduino-/Adafruit-Board?

I want to control (switch on/off) a solenoid valve via an RC power switch and an Adafruit M0 Feather Bluefruit LE. The RC power switch is this one, and this is the Adafruit Board Pinout. My ...