Hi,
I designed this footcontroller to be used with my band, in order to use Ableton Live as a multitrack, synchronised looping station.
Without entering the details, here is the principle :
http://img191.imageshack.us/i/midiold.pdf/The leds display the state of Live's looper (play, record, overdub and stop). Tempo led flashes according to the tempo of the loops (controlled by a track in live).
Here are the schematic and the layout :
http://img19.imageshack.us/i/schematicx.png/http://img844.imageshack.us/i/layoutjt.png/I have breadboarded and tested both 16F628 (midi send and state leds), both work perfectly. The midi merge pic (16F88) come from this site :
http://www.ucapps.de/midimerger.htmlWhen I tested the circuit, I first checked the DC rails, that were ok (all circuit gets 5V, with all IC sockets empty). Regulator didn't get hot.
I then put the 16F628 of the "midi note send". Then the PIC got very hot (couldn't keep my fingers on it), and so did the regulator. I the pulled the PIC out again and tested it on the breadboard : didn't work anymore. I the installed another programmed PIC after testing it on the breadboard : same thing.
I double checked my schematic, every solder on the PCB, eventual shortcuts, everything : all seems ok. I must admit that I don't know what to do now ! I might have done a mistake somewhere (maybe in the schematic) but I just don't find it !
Any clue would be appreciated !
Best regards.
Eric
PS : this is my first project with microcontrollers, I may not be aware of some important considerations !
PS2 : here are the programs I used (they worked when breadboarding) :
Midi note send :
//-----E/S-----
bit sw1 @ RA0; //-----Entrées
bit sw2 @ RA1;
bit sw3 @ RA2;
bit sw4 @ RA3;
bit sw5 @ RA4;
//-----Variables-----
unsigned tempo_ar : 16; //Variable de temporisation de l'antirebond
//-----Fonction antirebond-----
void antirebond(void)
{
for (tempo_ar=0;tempo_ar<10000;tempo_ar++); //antirebond de 20ms
}
//-----Fonctions principale-----
void main(void)
{
//-----Ports config-----
PORTA = 0x00; // Clear ports
PORTB = 0x00;
CMCON = 0x07; //Turn comparators off and enable pins
//for I/O functions
TRISA = 0b00011111; //RA0-4 are in, RA5-7 are out
TRISB = 0b00000010; //PORTB is out excepted RB1
//-----USART config-----
STATUS.5 = 1; //zap to bank1
SPBRG = 0x27; // init BRG 31250 bauds at 20MHz
TXSTA = 0b00100100;
STATUS.5 = 0; //Come back to bank0
RCSTA = 0b10010000;
for (;;) //read midi byte
{
if (sw1 == 1)
{
TXREG = 0x8F; //Send Note Channel Number
while (PIR1.4 == 0) //Wait until note is transmitted
{nop();}
TXREG = 0x01; //Send Note Key
while (PIR1.4 == 0)
{nop();}
TXREG = 0x01; //Send Note Velocity
while (PIR1.4 == 0)
{nop();}
while (sw1 == 1) //Wait until switch is released
{nop();}
antirebond();
}
if (sw2 == 1)
{
TXREG = 0x8F; //Send Note Channel Number
while (PIR1.4 == 0) //Wait until note is transmitted
{nop();}
TXREG = 0x02; //Send Note Key
while (PIR1.4 == 0)
{nop();}
TXREG = 0x01; //Send Note Velocity
while (PIR1.4 == 0)
{nop();}
while (sw2 == 1) //Wait until switch is released
{nop();}
antirebond();
}
if (sw3 == 1)
{
TXREG = 0x8F; //Send Note Channel Number
while (PIR1.4 == 0) //Wait until note is transmitted
{nop();}
TXREG = 0x00; //Send Note Key
while (PIR1.4 == 0)
{nop();}
TXREG = 0x01; //Send Note Velocity
while (PIR1.4 == 0)
{nop();}
while (sw3 == 1) //Wait until switch is released
{nop();}
antirebond();
}
if (sw4 == 1)
{
TXREG = 0x8F; //Send Note Channel Number
while (PIR1.4 == 0) //Wait until note is transmitted
{nop();}
TXREG = 0x04; //Send Note Key
while (PIR1.4 == 0)
{nop();}
TXREG = 0x01; //Send Note Velocity
while (PIR1.4 == 0)
{nop();}
while (sw4 == 1) //Wait until switch is released
{nop();}
antirebond();
}
if (sw5 == 1)
{
TXREG = 0x8F; //Send Note Channel Number
while (PIR1.4 == 0) //Wait until note is transmitted
{nop();}
TXREG = 0x05; //Send Note Key
while (PIR1.4 == 0)
{nop();}
TXREG = 0x01; //Send Note Velocity
while (PIR1.4 == 0)
{nop();}
while (sw5 == 1) //Wait until switch is released
{nop();}
antirebond();
}
}
}Looper state leds :
//-----E/S-----
bit tempo_led @ RB3; //-----Sortie
bit stop_led @ RB0;
bit rec_led @ RB5;
bit play_led @ RB6;
bit overdub_led @ RB7;
//-----Variables-----
unsigned tempo_metro : 16; //Variable de temporisation pour le metronome
char chan @ 0x20; //Midi Channel
char key @ 0x21; //Midi Key
char vel @ 0x22; //Midi Velocity
//-----Fonctions principale-----
void main(void)
{
//-----Ports config-----
PORTA = 0x00; // Clear ports
PORTB = 0x00;
CMCON = 0x07; //Turn comparators off and enable pins
//for I/O functions
TRISA = 0b00011111; //RA0-4 are in, RA5-7 are out
TRISB = 0b00000010; //PORTB is out excepted RB1
INTCON.5=0;
//-----USART config-----
STATUS.5 = 1; //zap to bank1
SPBRG = 0x07; // init BRG 31250 bauds at 4MHz
TXSTA = 0b00100100;
STATUS.5 = 0; //Come back to bank0
RCSTA = 0b10010000;
for (;;) //read midi byte
{
while (PIR1.5 == 0) //Read received note channel number
{nop();}
chan = RCREG;
while (PIR1.5 == 0) //Read received note key
{nop();}
key = RCREG;
while (PIR1.5 == 0) //Read received note velocity
{nop();}
vel = RCREG;
if (key == 0x01) //Looper in STOP mode
{
stop_led = 1;
play_led = 0;
rec_led = 0;
overdub_led = 0;
}
if (key == 0x02) //Looper in PLAY mode
{
stop_led = 0;
play_led = 1;
rec_led = 0;
overdub_led = 0;
}
if (key == 0x03) //Looper in REC mode
{
stop_led = 0;
play_led = 0;
rec_led = 1;
overdub_led = 0;
}
if (key == 0x04) //Looper in OVERDUB mode
{
stop_led = 0;
play_led = 0;
rec_led = 0;
overdub_led = 1;
}
if (key == 0x05) //Metronom note received
{
if (chan == 0x90) {tempo_led = 1;}
if (chan == 0x80) {tempo_led = 0;}
}
}
}
