module for Arduino  Analog AD Keyboard Module , Electronic Building Block
Electronic building blocks AD Keyboard Analog keyboard module
 
 
Description:

 
Use an analog port to read the five key states for Arduino save IO port. With Arduino sensor expansion board can be completed and buttons of interactive works.
Aruino test code:
/ / ADKeyboard Module
int adc_key_val [5] = {50, 200, 400, 600, 800};
int NUM_KEYS = 5;
int adc_key_in;
int key = -1;
int oldkey = -1;
void setup ()
{
pinMode (13, OUTPUT); / / we'll use the debug LED to output a heartbeat
Serial.begin (9600); / / 9600 bps
}
void loop ()
{
adc_key_in = analogRead (0); / / read the value from the sensor
digitalWrite (13, LOW);
key = get_key (adc_key_in); / / convert into key press
 
if (key! = oldkey) / / if keypress is detected
{
delay (50); / / wait for debounce time
adc_key_in = analogRead (0); / / read the value from the sensor
key = get_key (adc_key_in); / / convert into key press
if (key! = oldkey)
{
oldkey = key;
if (key> = 0) {
digitalWrite (13, HIGH);
switch (key)
{
case 0: Serial.println ("S1 OK");
break;
case 1: Serial.println ("S2 OK");
break;
case 2: Serial.println ("S3 OK");
break;
case 3: Serial.println ("S4 OK");
break;
case 4: Serial.println ("S5 OK");
break;
}
}
}
}
delay (100);
}
/ / Convert ADC value to key number
int get_key (unsigned int input)
{
int k;
for (k = 0; k <NUM_KEYS; k + +)
{
if (input <adc_key_val [k])
{
return k;
}
}
if (k> = NUM_KEYS) k = -1; / / No valid key pressed
return k;
 
 
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