pico touch pad demo

touch.txt

/*

touch demo for pico rp2040

cmake_minimum_required(VERSION 3.13)
set(PICO_SDK_PATH "/home/sonny/pico/pico-sdk")
set(PICOTOOL_FETCH_FROM_GIT_PATH "/home/sonny/pico/picotool")
set(PICO_BOARD waveshare_rp2040_zero CACHE STRING "Board type")
include(/home/sonny/pico/pico-sdk/external/pico_sdk_import.cmake)
project(main C CXX ASM)
pico_sdk_init()
add_executable(main main.c)
pico_enable_stdio_usb(main 1)
#pico_generate_pio_header(main ${CMAKE_CURRENT_LIST_DIR}/ws2812.pio) #use this line if you have pio
target_link_libraries(main pico_stdlib hardware_pio hardware_clocks hardware_gpio)
target_include_directories(main PUBLIC ${CMAKE_CURRENT_LIST_DIR}) #needed for usb printf
pico_add_extra_outputs(main)

press boot then press reset momentarily
sudo cp blink.uf2 /media/sonny/RPI-RP2

code from https://github.com/JeremySCook/picotouch/blob/main/arduino/capsensetest/capsensetest.ino

wire 1 megaohm resistor in series from gpio2 to ground
touch wire between gpio2 and resistor to activate touch

*/

#include <stdio.h>
#include <stdlib.h>
#include "pico/stdlib.h"
int raw=0;
int threshold=200; //adjust this for your own needs decrease or increase

//function readRaw() returns raw value
int readRaw(){
int temp=0;
for(int i=0; i<5; i++){
gpio_set_dir(2,1);
gpio_put(2,1);
sleep_us(10);
gpio_set_dir(2,0);
while(gpio_get(2) && temp < 10000){temp++;}
} return temp;}

int main(){
stdio_init_all();
sleep_ms(2000);
printf("starting...\n");
gpio_init(2); gpio_set_dir(2,1);
int baseline=readRaw(); //read baseline
for(;;){
raw=readRaw();
if(raw>baseline+threshold)printf("touched\n");//adjust 200 to suit your need up or down
else printf("not touched\n");
sleep_ms(100);}return 0;}