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

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30 views

I need alternative solution instance while loop ..Any other event / function are there ..? [on hold]

{Insert description of problem here} const int PIN_BUTTON = 10; int doorstatus = HIGH; // Door status, default High status void setup() { pinMode(10, INPUT_PULLUP); pinMode(LED_BUILTIN, OUTPUT);...
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33 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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1answer
43 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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69 views

New to arduino, help wiring relay

I am new to arduino and need some help. I just baught light bars for my jeep and wiring harnesses with them, the harnesses come with buttons and I wanted to replace the button and have them controlled ...
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1answer
87 views

Can I use an AC signal to make an LED light up with arduino?

I want to use a 220VAC load as a signal and act as a switch to my arduino so Labview could interpret it as an LED ON state. I used a 4n33 octocoupler but it seems that the LED Simulation on labview ...
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2answers
22 views

Encoder coupled with motor shaft.Encoder is giving larger redings than expected

I am a rookie and i dont have much experience on arduino. please help me. I intend to build a robot that will drive on a straight path even on nonuniform surfaces like the ones we see in agricultural ...
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1answer
49 views

My Code turns on my LED even when my switch is not pressed

I am trying to create a circuit that will turn my motor when I clap. When the first limit switch is low, and there is only one clap, a solenoid pin is supposed to be engaged (currently an LED), but ...
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2answers
126 views

LED on same Pin as Toggle Switch, not illuminating

I am trying to do something I think should be relatively simple. I would like to read an input from a toggle switch, and have a red 5mm LED indicate the state of the switch. Rather, however, than have ...
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32 views

How to measure multiple voltages (Thermocoupes)

How would one measure many (20-100) small voltages in the 0-80mV range with an Arduino? I will need to amplify them and put them into the ADC. But i also need to switch between them. I want to ...
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1answer
69 views

Switch Statement stuck in loop

I am writing a code for a user to enter a 4 digit pin, then use this pin later to unlock a box. The loop is stuck between the "ready to unlock box" and "enter pin" it just keeps flipping between ...
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0answers
29 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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1answer
76 views

Replace 6 pin on/off switch on Power Bank with 3pin or 2pin?

I'm looking to finish up my project in a box and i'm using a battery bank to power the Leonardo micro pro and other components. The bank has a little on/off which on it which has 6 pins underneath. ...
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1answer
110 views

Is this a good way to filter noise due to vibration in limit switch?

I have a circuit connected as follows my limit switches which are attached to my structure sometimes gets falsely triggered, so I wrote this code to address it. My motor is supposed to go down skip ...
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1answer
71 views

Replace mechanical switch with electrical switch or relay

I have a remote controller for a portable heater, and working on a small project to be able to control the fan on/off from an arduino with Bluetooh HM-10 module. I thought a solenoid might work by ...
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249 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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2answers
103 views

Using a toggle switch to run part of a sketch

First, I am a beginner for this. I just ordered my first book on coding Arduino and I'm working through some simple applications using a DS3231 (that has a temperature reading), LCD, MicroSD card ...
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1answer
79 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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3answers
90 views

Defining array in switch case

I’m completely new to arduino, so be polite. I’m trying to program my esp32 to drive neopixels as seven segment display. So I take a digit and pass it to switch case and in switch case I mention which ...
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1answer
53 views

Adding a switch to control log interval [closed]

HI this is a code for a set of logging scales. What I want to do is to add a switch that changes the logging from the set time of 1000 mills to either 5000 mills or 10000 mils depending on the switch ...
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4answers
304 views

How to boil down analog input to just three cases?

I am investigating the use of a 3-position-switch for one of my projects to switch between different settings using just one analog input pin. For the three positions I am using ground/0V, ~2.5V (via ...
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2answers
91 views

Is there a key switch for Arduino? [closed]

I am trying to make a launch controller, which will turn on with a key. Like the one in this photo below:
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1answer
552 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
248 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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2answers
260 views

Calculate sensor unique address with a 8 position DIP Switch

I have a large amount of sensor boards that I need to be able to configure setting unique addresses. Each sensor is attached to it's own arduino, I'm using a 8 position DIP switch for setting the ...
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3answers
227 views

Need help with a program for a button to change the display on an OLED display

So I am programming an OLED display from my Arduino Uno. I am trying to have a button that switches the different words on the display. (The words are just placeholders for programs as of now.) My ...
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1answer
79 views

How can I make a power button for my project powered by a USB powerbank? [closed]

I've solved the battery power supply issue for my Arduino project by simply connecting a USB powerbank. However, I just realised that I can't come up with a good way to add an on/off button! There ...
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1answer
77 views

Which transistor I should use to switch 12V 0.8A? [closed]

I am have circuit with Arduino NANO and I need to control air valve, which is powered with 12 Volts and 0.8 Amper. Problem is that Arduino NANO is powered with 5 volts. I want to use transistor to ...
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2answers
80 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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1answer
169 views

Transistor as switch for signal and high current buzzer [closed]

I'm a newbie in transistor switching. I have PIR sensors with C and NC onboard. NC is 12 V signal that I need to switch transistor (bipolar?) to emit 3.3 V (collector connected to 3.3 ...
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1answer
467 views

Arduino Uno Motor control using 2 Relays, 2 Limit switches and Bluetooth. Forward Reverse Stop

Modified existing project from this link: Problem : Trigger limit switch to stop DC motor I modified this code to control two relays which are wired to motor poles for Forward or Reverse movements ...
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2answers
438 views

Can i use a range in a switchcase like in pascal?

in pascal's case statement i can use this: Var i : integer; ... Case i of 1..5 : DoSomething; end; i was wondering if there is a way in can do this with c/c++ in the arduino compiler using:...
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1answer
138 views

How to create “Auto switch case”

I am new to programming. I want to modify this sketch and I really need help. I have a switch case in this sketch, and what I want is an auto change effect. In this sketch 18 color effects for ...
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263 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
43 views

Servo speed in a Toggle Code

I am new to Arduino and am trying to figure out servos. Right now I have a toggle button code for the servos. Although I want to know how to speed them up. Is there a way to do this? Currently, this ...
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2answers
53 views

SPST switch - powered from pin output, or voltage regulator

I have a SPST switch and I just want to sense whether it's on or not. I will then turn on/off a relay depending on the state of this switch. The two options I'm considering are: create a digital out ...
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1answer
97 views

Small Baseball Scoreboard using 2 to 3 breadboards

I'm helping my son start an Arduino small baseball scoreboard (roughly 2 or 3 breadboards in size). Im thinking to use qty 2, 2 digit 7 segment LED's (score of each team), an LCD 1602 module (inning ...
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1answer
283 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
124 views

Understanding how a tilt switch works [duplicate]

I am learning Arduino and pardon me if this is nooby. I am trying to make an LED glow when the tilt switch is tilted. The LED should not glow if the tilt is in normal position. The circuit and the ...
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2answers
766 views

Crosses Initialization in switch case with different size of array per case

void setup() { Serial.begin(9600); } void loop() { time_Text(2); } void time_Text(int PastTo_val) { switch (PastTo_val) { case 1: { int tPTT_y[] = {11, 11, 11, 11}; int tPTT_x[] = ...
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1answer
59 views

Can someone help me with my arduino and relay and switch?

This is my code. What i want to do is activate the relay when switchInNcPin is activate. I am using a switch (micro switch). It has COM NC and NO pins. Can you tell me what is wrong with my code? ...
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1answer
42 views

yellow LED not turning off in traffic light simulation

I wanted to make a simulation of a traffic light, and since I don't have any sensors I used a button to change between the different states (red/stop and green/drive). When the states are changing I ...
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1answer
513 views

How to make timed loops after switch / case?

I am working on a code, which is running a function once a second: switch (gearbox1) { case 1: //manually close Serial.println("Closing1"); digitalWrite(gear1OpenPin, OFF); t....
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2answers
104 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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2answers
1k views

State machine sketch to drive a DC motor with limit switches [closed]

I have a DC motor that will need to use two limit switches to detect end of travel in two directions. I've read that coding a state machine to do this task is the best method, however I have no idea ...
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1answer
162 views

Play .Wav sound only once on switch change [closed]

I have a project where if you change the value of the spdt switch the colour of the LEDs change. As well as this a .wav file plays. The problem is I only want the .wav to play once. At the moment it ...
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2answers
52 views

Why the program keeps applying what is in loop in first case and stops in the second one? [closed]

In the first program after removing hand from the button it keeps on, means it keeps applying what is in the loop: int led = 13; int button = 12; void setup() { pinMode(led, OUTPUT); pinMode(...
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2answers
590 views

Use of array in case statement

I want to know how I can use case statement for each array. Below is my code: int incomingByte = 0; void setup() { Serial.begin(115200); for (int thisPin = 2; thisPin < 6; thisPin++) { ...
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1answer
218 views

What is wrong with my state machines?

My goal is to make an automatic gate and garage door, and it has a servo as the lock mechanism on the gate, and alarm systems that notify when the gate or garage door is open too long, more than the ...
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2answers
361 views

Alternative of relay

I am carrying out a physics experiment using an Arduino. This experiment requires accurate time measurements of upto a millisecond. However I am using a relay to turn on/off an electromagnet and there ...
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1answer
2k views

Problem : Trigger limit switch to stop DC motor

I want to make a project about automatic gate and garage door via Android app and connected by HC-05 bluetooth module. Each of the gate and garage door have two limit switches(located at each end of ...