![\"\"](\"https:\/\/blog.eldhrimnir.comwp-content\/uploads\/2012\/03\/5ch_sw.bmp\" "\\"5ch_sw\\"")
<\/a><\/p>\n\u30b9\u30b1\u30c3\u30c1
\n[code]
\n\/\/example use of LCD4Bit_mod library
\n#include <stdio.h><\/p>\n
\/\/Key message
\nchar msgs[5][15] = {"Right Key OK ",
\n "Up Key OK ",
\n "Down Key OK ",
\n "Left Key OK ",
\n "Select Key OK" };
\nint adc_key_val[5] ={30, 150, 360, 535, 760 };
\nstatic uint8_t NUM_KEYS = 5;
\nint adc_key_in;
\nint key=-1;
\nstatic uint8_t oldkey=-1;<\/p>\n
void setup() {
\n \/\/ Setup Serial
\n Serial.begin(19200);<\/p>\n
Serial.println("KEYPAD testing… pressing");<\/p>\n
}<\/p>\n
void loop() {<\/p>\n
adc_key_in = analogRead(0); \/\/ read the value from the sensor
\n digitalWrite(13, HIGH);
\n key = get_key(adc_key_in);\t\t \/\/ convert into key press<\/p>\n
if (key != oldkey)\t\t\t\t \/\/ if keypress is detected
\n {
\n delay(50);\t\t\/\/ wait for debounce time
\n adc_key_in = analogRead(0); \/\/ read the value from the sensor
\n key = get_key(adc_key_in);\t\t \/\/ convert into key press
\n if (key != oldkey)
\n {
\n oldkey = key;
\n if (key >=0)
\n {
\n Serial.println(msgs[key]);
\n }
\n }
\n }<\/p>\n
\/\/delay(1000);
\n digitalWrite(13, LOW);
\n}<\/p>\n
\/\/ Convert ADC value to key number
\nint get_key(unsigned int input){
\n int k;<\/p>\n
for (k = 0; k < NUM_KEYS; k++){
\n if (input < adc_key_val[k]){
\n return k;
\n }
\n }<\/p>\n
if (k >= NUM_KEYS) k = -1; \/\/ No valid key pressed
\n return k;
\n}<\/p>\n
[\/code]<\/p>\n","protected":false},"excerpt":{"rendered":"
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![\"\"](\"https:\/\/blog.eldhrimnir.comwp-content\/uploads\/2012\/03\/DSC08502-res.jpg\" "\\"SONY")
<\/a><\/p>\n