\uc544\ub450\uc774\ub178 \uc18c\uc2a4 \ucf54\ub4dc: \ucd9c\ucc98(http:\/\/www.uctronics.com)<\/p>\n
16×2 LCD \uc274\ub4dc (\ud30c\ub780\uc0c9 \ubc31\ub77c\uc774\ud2b8)<\/p>\n
\n\/*
\nThe circuit:
\n* LCD RS pin to digital pin 8
\n* LCD Enable pin to digital pin 9
\n* LCD D4 pin to digital pin 4
\n* LCD D5 pin to digital pin 5
\n* LCD D6 pin to digital pin 6
\n* LCD D7 pin to digital pin 7
\n* LCD BL pin to digital pin 10
\n* KEY pin to analogl pin 0
\n*\/<\/p>\n
#include<\/p>\n
LiquidCrystal lcd(8, 13, 9, 4, 5, 6, 7);<\/p>\n
char msgs[5][16] = {“Right Key OK “,
\n“Up Key OK “,
\n“Down Key OK “,
\n“Left Key OK “,
\n“Select Key OK” };<\/p>\n
int adc_key_val[5] ={50, 200, 400, 600, 800 };
\nint NUM_KEYS = 5;
\nint adc_key_in;
\nint key=-1;
\nint oldkey=-1;<\/p>\n
void setup()
\n{
\nlcd.clear();
\nlcd.begin(16, 2);
\nlcd.setCursor(0,0);
\nlcd.print(“ADC key testing”);
\n}<\/p>\n
void loop()
\n{
\nadc_key_in = analogRead(0); \/\/ read the value from the sensor
\nkey = get_key(adc_key_in); \/\/ convert into key press<\/p>\n
if (key != oldkey) \/\/ if keypress is detected
\n{
\ndelay(50); \/\/ wait for debounce time
\nadc_key_in = analogRead(0); \/\/ read the value from the sensor
\nkey = get_key(adc_key_in); \/\/ convert into key press
\nif (key != oldkey)
\n{
\nlcd.setCursor(0, 1);
\noldkey = key;
\nif (key >=0){
\nlcd.print(msgs[key]);
\n}
\n}
\n}
\ndelay(100);
\n}<\/p>\n
\/\/ Convert ADC value to key number
\nint get_key(unsigned int input)
\n{
\nint k;<\/p>\n
for (k = 0; k < NUM_KEYS; k++)
\n{
\nif (input < adc_key_val[k]) { return k; } } if (k >= NUM_KEYS)k = -1; \/\/ No valid key pressed
\nreturn k;
\n}<\/p>\n","protected":false},"excerpt":{"rendered":"
\uc544\ub450\uc774\ub178 \uc18c\uc2a4 \ucf54\ub4dc: \ucd9c\ucc98(http:\/\/www.uctronics.com) 16×2 LCD \uc274\ub4dc (\ud30c\ub780\uc0c9 \ubc31\ub77c\uc774\ud2b8) \/* The circuit: * LCD RS pin to digital pin 8 * LCD Enable pin to digital pin 9 *… <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.goorigo.com\/index.php?rest_route=\/wp\/v2\/posts\/1230"}],"collection":[{"href":"https:\/\/blog.goorigo.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.goorigo.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.goorigo.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.goorigo.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1230"}],"version-history":[{"count":0,"href":"https:\/\/blog.goorigo.com\/index.php?rest_route=\/wp\/v2\/posts\/1230\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.goorigo.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1230"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.goorigo.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1230"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.goorigo.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1230"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}