Also at the show we will be promoting amateur radio. For this we have a display panel "LEARN _ BUILD _ PLAY". And a tiny demo using an Arduino to send an automated morse message "CQ CQ CQ DE GB5BRA GB5BRA K".
Circuit
Here's the code:// Morse transmitter, with oscillator
// LED & OSC Pin 7
// output pin
#define LEDPIN 7
// text array codes
#define DOT 0
#define DASH 1
#define SPACE 2
#define WORD 3
// message words
int CQ[] = {1,0,1,0,2,1,1,0,1,3};
int DE[] = {1,0,0,2,0,3};
int GB5BRA[] = {1,1,0,2,1,0,0,0,2,0,0,0,0,0,2,1,0,0,0,2,0,1,0,2,0,1,3};
int K[] = {1,0,1,3};
// dash = 3 dots, space = 3 dots, word = 7 dots
#define DOTTIME 150
void setup()
{
pinMode(LEDPIN, OUTPUT);
}
void loop()
{
// send message words, sends CQ CQ CQ DE GB5BRA GB5BRA K
sender(CQ);
sender(CQ);
sender(CQ);
sender(DE);
sender(GB5BRA);
sender(GB5BRA);
sender(K);
delay(2000); // repeat after 2 secs
}
// send a word
void sender(int dida[]) {
int x = 0; // array index
// send characters up to end of word
while(dida[x] != WORD) {
switch (dida[x]) {
case DOT:
transmit(DOTTIME);
delay(DOTTIME); // add after dot
break;
case DASH:
transmit(3 * DOTTIME);
delay(DOTTIME); // add after dash
break;
case SPACE:
delay(2 * DOTTIME); // add for space
break;
}
x++;
}
delay(6 * DOTTIME); // add for word
}
// transmit for time (msec)
void transmit(long time) {
digitalWrite(LEDPIN, HIGH); // turn on LED
delay(time); // time
digitalWrite(LEDPIN, LOW); // turn off LED
}
Update: Its a pity but the Banbury Show, where the project would be shown, was cancelled 3 days before it was due, because of a water logged field.
