Hello community,
I am using 4x4 matrix keypad, i need the library for it. I am using it in in idf. Possible solutions of were can i get the library?? Or map some other keypad resources to work with?/
4x4 matrix keyboard lib for idf
- martinayotte
- Posts: 141
- Joined: Fri Nov 13, 2015 4:27 pm
Re: 4x4 matrix keyboard lib for idf
Since 4x4 matrix need simple 4 GPIOs as outputs and 4 other GPIOs as input, there is no need for complex library.
-
- Posts: 16
- Joined: Fri Jan 18, 2019 5:55 am
Re: 4x4 matrix keyboard lib for idf
can you just suggest me the working so that i can make on my own, i already did with gpio's which is partially done using algorithm i found in youtube, im not sure i understood it fully.
- martinayotte
- Posts: 141
- Joined: Fri Nov 13, 2015 4:27 pm
Re: 4x4 matrix keyboard lib for idf
Googling a bit will reveal tons of tutorial, some using libraries, some plain code, like this one :
https://www.baldengineer.com/arduino-ke ... orial.html
-
- Posts: 16
- Joined: Fri Jan 18, 2019 5:55 am
Re: 4x4 matrix keyboard lib for idf
THis is my code implemented from the instructions here http://www.circuitbasics.com/how-to-set ... n-arduino/
can you just help me in this issue, i want to read 4x4 keypad with esp32
can you just help me in this issue, i want to read 4x4 keypad with esp32
Code: Select all
#include "freertos/FreeRTOS.h"
#include "esp_wifi.h"
#include "esp_system.h"
#include "esp_event.h"
#include "esp_event_loop.h"
#include "nvs_flash.h"
#include "driver/gpio.h"
esp_err_t event_handler(void *ctx, system_event_t *event)
{
return ESP_OK;
}
void leveltask(void *pvParameter)
{
while(1){
gpio_set_level(16,1); //c1
gpio_set_level(17,1); //c2
gpio_set_level(5,1); //c3
gpio_set_level(18,1); //c4 // default , column check stop
gpio_set_level(27,0); //r1
gpio_set_level(26,0); //r2
gpio_set_level(25,0); //r3
gpio_set_level(33,0); //r4
printf("checking");
vTaskDelay(10 / portTICK_PERIOD_MS);
}
}
void app_main(void)
{
gpio_pad_select_gpio(27); //r1
gpio_set_direction(27, GPIO_MODE_INPUT_OUTPUT);
gpio_pad_select_gpio(26); //r2
gpio_set_direction(26, GPIO_MODE_INPUT_OUTPUT);
gpio_pad_select_gpio(25); //r3
gpio_set_direction(25, GPIO_MODE_INPUT_OUTPUT);
gpio_pad_select_gpio(33); //r4
gpio_set_direction(33, GPIO_MODE_INPUT_OUTPUT);
gpio_pad_select_gpio(17); //c1
gpio_set_direction(17, GPIO_MODE_INPUT_OUTPUT);
gpio_pad_select_gpio(16); //c2
gpio_set_direction(16, GPIO_MODE_INPUT_OUTPUT);
gpio_pad_select_gpio(5); //c3
gpio_set_direction(5, GPIO_MODE_INPUT_OUTPUT);
gpio_pad_select_gpio(18); //c4
gpio_set_direction(18, GPIO_MODE_INPUT_OUTPUT);
xTaskCreate(&leveltask, "leveltask", 2048, NULL, 5, NULL);
while(1)
{
if(gpio_get_level(16) == 0) //column 1 //set level iruka ila store pananuma nu also check loop since printf prints la
{
gpio_set_level(27,1); //r1
{
if(gpio_get_level(27) && gpio_get_level(16) == 1){printf("button 1 pressed!");}
else if(gpio_get_level(27) && gpio_get_level(17) == 1){printf("button 2 pressed!");}
else if(gpio_get_level(27) && gpio_get_level(5) == 1){printf("button 3 pressed!");}
else if(gpio_get_level(27) && gpio_get_level(18) == 1){printf("button A pressed!");}
}
gpio_set_level(26,1); //r2
{
if(gpio_get_level(26) && gpio_get_level(16) == 1){printf("button 4 pressed!");}
else if(gpio_get_level(26) && gpio_get_level(17) == 1){printf("button 5 pressed!");}
else if(gpio_get_level(26) && gpio_get_level(5) == 1){printf("button 6 pressed!");}
else if(gpio_get_level(26) && gpio_get_level(18) == 1){printf("button B pressed!");}
}
gpio_set_level(25,1); //r3
{
if(gpio_get_level(25) && gpio_get_level(16) == 1){printf("button 7 pressed!");}
else if(gpio_get_level(25) && gpio_get_level(17) == 1){printf("button 8 pressed!");}
else if(gpio_get_level(25) && gpio_get_level(5) == 1){printf("button 9 pressed!");}
else if(gpio_get_level(25) && gpio_get_level(18) == 1){printf("button C pressed!");}
}
gpio_set_level(33,1); //r4
{
if(gpio_get_level(33) && gpio_get_level(16) == 1){printf("button * pressed!");}
else if(gpio_get_level(33) && gpio_get_level(17) == 1){printf("button 0 pressed!");}
else if(gpio_get_level(33) && gpio_get_level(5) == 1){printf("button # pressed!");}
else if(gpio_get_level(33) && gpio_get_level(18) == 1){printf("button D pressed!");}
}
gpio_set_level(27,0); gpio_set_level(26,0); gpio_set_level(25,0); gpio_set_level(33,0);
}
if(gpio_get_level(17) == 0) //column 2
{
gpio_set_level(27,1); //r1
{
if(gpio_get_level(27) && gpio_get_level(16) == 1){printf("button 1 pressed!");}
else if(gpio_get_level(27) && gpio_get_level(17) == 1){printf("button 2 pressed!");}
else if(gpio_get_level(27) && gpio_get_level(5) == 1){printf("button 3 pressed!");}
else if(gpio_get_level(27) && gpio_get_level(18) == 1){printf("button A pressed!");}
}
gpio_set_level(26,1); //r2
{
if(gpio_get_level(26) && gpio_get_level(16) == 1){printf("button 4 pressed!");}
else if(gpio_get_level(26) && gpio_get_level(17) == 1){printf("button 5 pressed!");}
else if(gpio_get_level(26) && gpio_get_level(5) == 1){printf("button 6 pressed!");}
else if(gpio_get_level(26) && gpio_get_level(18) == 1){printf("button B pressed!");}
}
gpio_set_level(25,1); //r3
{
if(gpio_get_level(25) && gpio_get_level(16) == 1){printf("button 7 pressed!");}
else if(gpio_get_level(25) && gpio_get_level(17) == 1){printf("button 8 pressed!");}
else if(gpio_get_level(25) && gpio_get_level(5) == 1){printf("button 9 pressed!");}
else if(gpio_get_level(25) && gpio_get_level(18) == 1){printf("button C pressed!");}
}
gpio_set_level(33,1); //r4
{
if(gpio_get_level(33) && gpio_get_level(16) == 1){printf("button * pressed!");}
else if(gpio_get_level(33) && gpio_get_level(17) == 1){printf("button 0 pressed!");}
else if(gpio_get_level(33) && gpio_get_level(5) == 1){printf("button # pressed!");}
else if(gpio_get_level(33) && gpio_get_level(18) == 1){printf("button D pressed!");}
}
gpio_set_level(27,0); gpio_set_level(26,0); gpio_set_level(25,0); gpio_set_level(33,0);
}
if(gpio_get_level(5) == 0) // column 3
{
gpio_set_level(27,1); //r1
{
if(gpio_get_level(27) && gpio_get_level(16) == 1){printf("button 1 pressed!");}
else if(gpio_get_level(27) && gpio_get_level(17) == 1){printf("button 2 pressed!");}
else if(gpio_get_level(27) && gpio_get_level(5) == 1){printf("button 3 pressed!");}
else if(gpio_get_level(27) && gpio_get_level(18) == 1){printf("button A pressed!");}
}
gpio_set_level(26,1); //r2
{
if(gpio_get_level(26) && gpio_get_level(16) == 1){printf("button 4 pressed!");}
else if(gpio_get_level(26) && gpio_get_level(17) == 1){printf("button 5 pressed!");}
else if(gpio_get_level(26) && gpio_get_level(5) == 1){printf("button 6 pressed!");}
else if(gpio_get_level(26) && gpio_get_level(18) == 1){printf("button B pressed!");}
}
gpio_set_level(25,1); //r3
{
if(gpio_get_level(25) && gpio_get_level(16) == 1){printf("button 7 pressed!");}
else if(gpio_get_level(25) && gpio_get_level(17) == 1){printf("button 8 pressed!");}
else if(gpio_get_level(25) && gpio_get_level(5) == 1){printf("button 9 pressed!");}
else if(gpio_get_level(25) && gpio_get_level(18) == 1){printf("button C pressed!");}
}
gpio_set_level(33,1); //r4
{
if(gpio_get_level(33) && gpio_get_level(16) == 1){printf("button * pressed!");}
else if(gpio_get_level(33) && gpio_get_level(17) == 1){printf("button 0 pressed!");}
else if(gpio_get_level(33) && gpio_get_level(5) == 1){printf("button # pressed!");}
else if(gpio_get_level(33) && gpio_get_level(18) == 1){printf("button D pressed!");}
}
gpio_set_level(27,0); gpio_set_level(26,0); gpio_set_level(25,0); gpio_set_level(33,0);
}
if(gpio_get_level(18) == 0) //column 4
{
gpio_set_level(27,1); //r1
{
if(gpio_get_level(27) && gpio_get_level(16) == 1){printf("button 1 pressed!");}
else if(gpio_get_level(27) && gpio_get_level(17) == 1){printf("button 2 pressed!");}
else if(gpio_get_level(27) && gpio_get_level(5) == 1){printf("button 3 pressed!");}
else if(gpio_get_level(27) && gpio_get_level(18) == 1){printf("button A pressed!");}
}
gpio_set_level(26,1); //r2
{
if(gpio_get_level(26) && gpio_get_level(16) == 1){printf("button 4 pressed!");}
else if(gpio_get_level(26) && gpio_get_level(17) == 1){printf("button 5 pressed!");}
else if(gpio_get_level(26) && gpio_get_level(5) == 1){printf("button 6 pressed!");}
else if(gpio_get_level(26) && gpio_get_level(18) == 1){printf("button B pressed!");}
}
gpio_set_level(25,1); //r3
{
if(gpio_get_level(25) && gpio_get_level(16) == 1){printf("button 7 pressed!");}
else if(gpio_get_level(25) && gpio_get_level(17) == 1){printf("button 8 pressed!");}
else if(gpio_get_level(25) && gpio_get_level(5) == 1){printf("button 9 pressed!");}
else if(gpio_get_level(25) && gpio_get_level(18) == 1){printf("button C pressed!");}
}
gpio_set_level(33,1); //r4
{
if(gpio_get_level(33) && gpio_get_level(16) == 1){printf("button * pressed!");}
else if(gpio_get_level(33) && gpio_get_level(17) == 1){printf("button 0 pressed!");}
else if(gpio_get_level(33) && gpio_get_level(5) == 1){printf("button # pressed!");}
else if(gpio_get_level(33) && gpio_get_level(18) == 1){printf("button D pressed!");}
}
gpio_set_level(27,0); gpio_set_level(26,0); gpio_set_level(25,0); gpio_set_level(33,0);
}
}
}
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