Questions tagged [keypad]
The keypad tag has no summary.
44 questions
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Arduino keypad shield with motor
I bought an Arduino keypad shield.
I want to operate a DC or servo motor when I press button on the keypad shield.
In image, I connected keypad shield with an Arduino Uno by wiring up J1, J2, RW, E, ...
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1
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106
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Keypad library isn't working or I am wrong somewhere [closed]
I am using PICSimLab to simulate a keypad. The configuration of the keypad is as shown in the picture:
and the code is:
#include <LiquidCrystal.h>
#include <Key.h>
#include <Keypad.h&...
0
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1
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163
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Unable to get keypad key in while loop [closed]
I'm a beginner into Arduino so I have a little problem where I'm trying to do a countdown on LCD using while loop but I'm also trying to get a key input inside that same while loop. Problem is that ...
- 13
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Why is my variable giving the wrong value?
I'm making a program to show numbers in a WS2812 LED and TM1637. I'm also using a common 4x4 keypad.
The WS2812 LED is just DIY with 25 x 10. Only two values can be displayed in a LED matrix just now. ...
- 13
3
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1
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645
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Problem when coding 4x4 keypad's key detection (without library)
Part of my current assignment involves reading the input from a 4x4 keypad connected to an Arduino UNO. While this may be done easily using <Keypad.h>, the project is being done with Tinkercad's ...
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110
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Automatic pet feeder with a simple menu type keypad
this is the sample code where the user enters A to set the number of times the pet needs to be fed. When I click A on the keypad it asks for the user to set the number. However, the keypad still ...
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1
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120
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Making library for arduino
I'm learning library making on arduino , I want to make a library that works with arrays a user sets, e.g:
User sets array of int,
when a certain function is been called the library will check if ...
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4x3 keypad not providing any output and the output it does provide is incorrect
I am trying to figure out how to use a 4x3 keypad and just want to receive the key numbers I select on the serial monitor. The problem I am getting is that some of the keys I type don't give me any ...
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1
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1k
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No matching function for call to'DS3231 (const uint8_t &, const uint8_t &)
This was supposed to be the code for automatic pet feeder
Got it from here1
The problem is that I always got a "No matching function for call to'DS3231 (const uint8_t &, const uint8_t &)&...
-1
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2
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360
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Char array filling with blanks
When I run this code, my pin and pinCheck arrays are not being filled with the results of keypad.getKey(). If I print the value at each index, the result is blank. As far as I can tell, I am either ...
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284
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Code question: LCD keypad Shield. How do I define the buttons?
I am trying to adapt a alarm clock sketch that used external buttons, but I would like to utilize a LCD Keypad Shield. The data sheet says all the buttons are on pin A0, so every button is "set ...
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150
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Connecting various devices to Arduino
I need to connect the following devices to an Arduino UNO board. The problem is that I run out of pins to be able to connect them all. Is there any way to do it?
ultrasonic sensor
yellow led
green ...
- 11
2
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1
answer
2k
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Using CD74HC4067 16-Channel Analog Multiplexer Demultiplexer is not working as expected
I am working on a project that needs multiple digital signals and I am considering the CD74HC4067 (on a break-board) to work as a multiplexer. More specifically i am trying to build a keypad with ...
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1
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324
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How to make Arduino to read 1X4 keypad multiple times?
I want to use 1X4 membrane keypad to enter 3 working parameters for LED string controlled by Arduino mini. Keypad is attached to D2-D5 pins and LED is attached to pin 12. My objective is to set the ...
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73
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I can't show the button pressed on the GLCD ST7920?
I have a small project that i want to show my keypad pressed on my GLCD but when i pressed keypad, even on serial it is fines but on GLCD it can't show my characters. Could you tell me what the ...
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