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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2answers
59 views

How to toggle LED and motor on button press?

we want to have a LED turn on with the press of a button, and become brigther and brighter as times go by (whithin a defined time frame), and when it reaches maximum brightness to turn off for a ...
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0answers
18 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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1answer
37 views

Control 4 digital outputs with one switch

I want to control 4 digital outputs (d0, d1, d2, d3) with one switch. When the Arduino starts, they should all be in state LOW. Now, after pressing the button once, d0 should get HIGH. Another push ...
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27 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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2answers
49 views

LCD screen won't stop printing the same characters twice

I'm hoping that someone might be able to help me figure out how to prevent my LCD from giving me double digits (i.e. 55, 66, 77 - instead of 5,6,7); I have 2 functions that are printing, so I'm ...
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0answers
41 views

How can I make a fingerprint scanner to work as a toggle for a servo motor using Arduino Uno?

Arduino Fingerprint Project Help Please!! I am a beginner and using Arduino Uno, a fingerprint sensor and a servo motor to build a door lock (school science project). I followed many videos and ...
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2answers
40 views

Cycling through switch states

I'm making a desk lamp out of 2x WS2811 strips (attached to the triple ports at top right of board below). The brightness of the strips is controlled by a potentiometer, and the colour by a switch. ...
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0answers
36 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
118 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
74 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
94 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
23 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
54 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
254 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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0answers
35 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
109 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
31 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
98 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. ...
2
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1answer
168 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
78 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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0answers
357 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
254 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
83 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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1answer
70 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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3answers
164 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
61 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
384 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
128 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
800 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
323 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 ...
2
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2answers
398 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
358 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 ...
2
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1answer
88 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
84 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
83 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
225 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
596 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
614 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
198 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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0answers
345 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
50 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
56 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 ...
1
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1answer
115 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
355 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 ...
1
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1answer
144 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
1k 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
60 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
45 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 ...
0
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1answer
620 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....
2
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2answers
129 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 ...