Forum >Replies by gbcstott
Replies （1）
- You Reply: First of all, I know that this topic is old, but I just got my RoMeo board and tried the Button 1-5 example from the wiki for this board and found that it did not work. I then come and look at this topic to see what was wrong. I expect other people will do the same so I want to post what I found wrong.
First the example has a typo. The line for Serial.println(msgs[keys]) has println with a capital I instead of a little l.
Second the example does not do a begin of the serial port. so no serial port output.
Here is my sketch after I fix the above and added some more output messages. I Upload this to the board and then started a Serial Monitor. I have also put an example output at theend of this messages. Hope this helps:
//
// Key message
char msgs[5][15] = {"Right Key OK ",
"Up Key OK ",
"Down Key OK ",
"Left Key OK ",
"Select Key OK" };
char start_msg[15] = {"Start loop "};
int adc_key_val[5] ={30, 150, 360, 535, 760 };
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);
/* Print that we made it here */
Serial.println(start_msg);
}
void loop()
{
adc_key_in = analogRead(7); // read the value from the sensor
digitalWrite(13, HIGH);
/* get the key */
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(7); // read the value from the sensor
key = get_key(adc_key_in); // convert into key press
if (key != oldkey) {
oldkey = key;
if (key >=0){
Serial.println(adc_key_in, DEC);
Serial.println(msgs[key]);
}
}
}
digitalWrite(13, LOW);
}
// 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;
}
Here is the output as I pressed the keys:
Start loop
0
Right Key OK
146
Up Key OK
331
Down Key OK
507
Left Key OK
742
Select Key OK
0
Right Key OK