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Questions tagged [keypad]

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1answer
21 views

Switch Case Return , Return not printing

I am trying to get the value of a key pressed and set it to return a value to use in a loop. In the code below the Print(t) does not show anything #include <Keypad.h> const byte ROWS = 4; //...
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2answers
28 views

Including keypad library removes sound from my piezo element

I am using the keypad library to include keypad and input numbers. when a specific number is entered a sound must be made. However when I input using the serial monitor , sound is working. But when I ...
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0answers
21 views

Completing an action on button release help with delaying to give other modules time to repond

I'm currently having problems with my code it has several modules within the main one is my current keypad one working of a mcp23017. what I needed it to do is count how long a key is pressed and upon ...
0
votes
1answer
33 views

Is there a way for keypad to stop the buzzer while it is running?

I am new to arduino, currently I am looking for a way to make the keypad able to stop the buzzer making a siren alarm when password are keyed in wrong and able to move into password screen by pressing ...
0
votes
2answers
44 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
40 views

Code is not running despite no errors in IDE?

I'm working with a membrane keypad to make a password keypad. I have installed the Keypad and Password libraries and pieced together pieces of code with little tweaks. My question is why pressing the "...
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0answers
29 views

Not Able to get INPUT_PULLUP pinmodes to work on multiple pins

I am working with an Arduino nano, and ic2 128x32 OLED display and a 1x4 membrane keypad. Problem is that only one of the 4 pins are detecting the button press. it's not the Arduino, I already was ...
-2
votes
1answer
26 views

Code for key boaed

I am using a 16 button keypad with the standard keys (123A...0#D). On some of the keys the alphabet is shown. On the key "0" it has "OPER" above. I am using an Arduino UNO and a NANO. Can anyone ...
0
votes
1answer
24 views

how to use keypad button multiple integer value input [closed]

I have been working on water flow sensor which measures volume then i need to restrict the amount of water which disperse from depend on the user input form the keypad so how can i store the input ...
0
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0answers
30 views

Keypad code not working

I am new I took a code of keypad in arduino. Arduino code is not working in setup area but if I place the same code in loop are it works why? Kindly guide me. Here is the code. #include <Keypad.h&...
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0answers
31 views

How can if resolve this conflict between matrix keypad library and neopixel library?

I'm trying to use a 4x3 matrix keypad as a user interface to control parameters of a Neopixel strip control program. I'm using Adafruit's Neopixel library and This Keypad library. Both work fine on ...
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1answer
94 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 ...
-1
votes
1answer
60 views

Does this sound like a good approach to decoding a dumb keypad?

The background: I bought a "dumb" 8-pin 4x4 keypad for use in a project. (This one: https://www.sparkfun.com/products/14881 It has a wire connected to each row, and a wire connected to each column. ...
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2answers
29 views

Servo starts to shake when I added SIM900.begin(19200);

Hello I'm working on this mini project. This project works this way, Whenever someone type wrong password, LCD will display "Access Denied" and send an alert to SMS using GSM module. I used 2 ...
0
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1answer
232 views

Why does my 16x2 LCD displays weird letters and can't insert key from keypad?

I'm a newbie on Arduino here, and this is my first project on 16x2 LCD, 4x4 keypad and others. So, the story is, after I uploaded the program for my group's Arduino alarm clock to the Arduino board, ...