Hi, I’ve a problem with the USB comunication from PC with python and
ARDUINOUNO.
I wrote a little python program than can transmit ‘a’ caracter in the USB port
to and ARDUINOUNO.
I just post below my python code than can make that:
import time
import serial
import keyboard
import pynput
try:
connect = serial.Serial("/dev/ttyACM0", 115200)
if connect.is_open:
print ("\n Il collegamento è stato effettuato con successo \n")
#ser.close()
except:
print("""
Collegamento fallito,
controllare se il dispositivo è stato connesso correttamente,
o di avere inserito il nome della porta corretto \n""")
i=b'a\n'
while 1:
if(keyboard.is_pressed('a')):
connect.write(i)
This one above transmit le ‘a’ caracter when i press ‘a’ key.
Below I post the code inside ARDUINOUNO than can receive the letter ‘a’.
#include "Arduino.h"
#include "MCP4251.h"
#include "TimerOne.h"
#define MAX_BUFFER 2
//void read_USB();
int elemento_buffer=0;
char buffer[MAX_BUFFER];
#define cs1 2
#define cs2 3
#define cs3 4
#define cs4 5
#define cs5 6
#define cs6 7
#define cs7 8
#define cs8 9
#define cs9 10
#define cs14 14
#define pot0ResistanceRmax 100000 // These resistance values may vary
#define pot0ResistanceRmin 0
#define pot1ResistanceRmax 100000
#define pot1ResistanceRmin 0
extern TimerOne Timer0;
extern TimerOne Timer2;
extern TimerOne Timer3;
float fr0=879;
int a1=3300;
float fr1=1783;
int a2=9900;
float fr2=2722;
int a3=17000;
float fr3=3565;
int a4=17800;
float fr4=6528;
int a5=19000;
int mast_vol=20000;
int vol=0;
unsigned long tatt = 0;
unsigned long microsecatt = (tatt / 1000);
unsigned long tdec = 2000000000;
unsigned long microsecdec = (tdec / 1000);
MCP4251 f0(cs1, pot0ResistanceRmax, pot0ResistanceRmin, pot1ResistanceRmax, pot1ResistanceRmin);
MCP4251 f1(cs2, pot0ResistanceRmax, pot0ResistanceRmin, pot1ResistanceRmax, pot1ResistanceRmin);
MCP4251 f2(cs3, pot0ResistanceRmax, pot0ResistanceRmin, pot1ResistanceRmax, pot1ResistanceRmin);
MCP4251 f3(cs4, pot0ResistanceRmax, pot0ResistanceRmin, pot1ResistanceRmax, pot1ResistanceRmin);
MCP4251 f4(cs5, pot0ResistanceRmax, pot0ResistanceRmin, pot1ResistanceRmax, pot1ResistanceRmin);
MCP4251 f5(cs6, pot0ResistanceRmax, pot0ResistanceRmin, pot1ResistanceRmax, pot1ResistanceRmin);
MCP4251 f6(cs7, pot0ResistanceRmax, pot0ResistanceRmin, pot1ResistanceRmax, pot1ResistanceRmin);
MCP4251 f7(cs8, pot0ResistanceRmax, pot0ResistanceRmin, pot1ResistanceRmax, pot1ResistanceRmin);
MCP4251 f8(cs9, pot0ResistanceRmax, pot0ResistanceRmin, pot1ResistanceRmax, pot1ResistanceRmin);
MCP4251 f9(cs14, pot0ResistanceRmax, pot0ResistanceRmin, pot1ResistanceRmax, pot1ResistanceRmin);
void setup() {
Serial.begin(9600);
f0.begin();
f0.DigitalPotTerminalBConnect(0);
f0.DigitalPotTerminalAConnect(0);
f0.DigitalPotWiperConnect(0);
f1.begin();
f1.DigitalPotTerminalBConnect(0);
f1.DigitalPotTerminalAConnect(0);
f1.DigitalPotWiperConnect(0);
f2.begin();
f2.DigitalPotTerminalBConnect(0);
f2.DigitalPotTerminalAConnect(0);
f2.DigitalPotWiperConnect(0);
f3.begin();
f3.DigitalPotTerminalBConnect(0);
f3.DigitalPotTerminalAConnect(0);
f3.DigitalPotWiperConnect(0);
f4.begin();
f4.DigitalPotTerminalBConnect(0);
f4.DigitalPotTerminalAConnect(0);
f4.DigitalPotWiperConnect(0);
f5.begin();
f5.DigitalPotTerminalBConnect(0);
f5.DigitalPotTerminalAConnect(0);
f5.DigitalPotWiperConnect(0);
f6.begin();
f6.DigitalPotTerminalBConnect(0);
f6.DigitalPotTerminalAConnect(0);
f6.DigitalPotWiperConnect(0);
f7.begin();
f7.DigitalPotTerminalBConnect(0);
f7.DigitalPotTerminalAConnect(0);
f7.DigitalPotWiperConnect(0);
f8.begin();
f8.DigitalPotTerminalBConnect(0);
f8.DigitalPotTerminalAConnect(0);
f8.DigitalPotWiperConnect(0);
f9.begin();
f9.DigitalPotTerminalBConnect(0);
f9.DigitalPotTerminalAConnect(0);
f9.DigitalPotWiperConnect(0);
//Timer0.initialize(1000000000);
//Timer0.attachInterrupt(read_USB);
//Timer1.initialize(microsecdec);
//Timer1.attachInterrupt(decay);
//interrupts();
Serial.begin(115200);
while (!Serial)
delay(10); // will pause Zero, Leonardo, etc until serial console opens
Serial.println("OK!");
//Timer1.initialize(1000000); //testa se ci sono comandi sulla USB ogni 1msec
//Timer1.attachInterrupt(read_USB); // read USB to run every 0.15 seconds
}
uint16_t wiper0;
uint16_t wiper1;
float conv_freq4_5(float freq)
{
float restot;
restot = 1 / (freq * 0.082);
restot = restot * 1000000;
restot = restot - 2200;
restot = restot / 2;
return restot;
}
float conv_freq1_2_3(float freq)
{
float restot;
restot = 1 / (freq * 6.28 * 0.022);
restot = restot * 1000000;
return restot;
}
void freq0(float freq)
{
float resistenza = conv_freq1_2_3(freq);
//primo pot. (10K)
wiper0 = f0.DigitalPotResistanceToPosition(0, resistenza * 2);
f0.DigitalPotSetWiperPosition(0, wiper0);
//secondo pot. (10K)
wiper1 = f0.DigitalPotResistanceToPosition(1, resistenza * 2);
f0.DigitalPotSetWiperPosition(1, wiper1);
//terzo pot. dig. (5K)
wiper0 = f1.DigitalPotResistanceToPosition(0, resistenza);
f1.DigitalPotSetWiperPosition(0, wiper0);
}
void freq1(float freq)
{
float resistenza = conv_freq1_2_3(freq);
//primo pot. (10K)
wiper1 = f2.DigitalPotResistanceToPosition(1, resistenza * 2);
f2.DigitalPotSetWiperPosition(1, wiper1);
//secondo pot. (10K)
wiper0 = f2.DigitalPotResistanceToPosition(0, resistenza * 2);
f2.DigitalPotSetWiperPosition(0, wiper0);
//terzo pot. dig. (5K)
wiper1 = f1.DigitalPotResistanceToPosition(1, resistenza);
f1.DigitalPotSetWiperPosition(1, wiper1);
}
void freq2(float freq)
{
float resistenza = conv_freq1_2_3(freq);
//primo pot. (10K)
wiper0 = f3.DigitalPotResistanceToPosition(0, resistenza * 2);
f3.DigitalPotSetWiperPosition(0, wiper0);
//secondo pot. (10K)
wiper1 = f3.DigitalPotResistanceToPosition(1, resistenza * 2);
f3.DigitalPotSetWiperPosition(1, wiper1);
//terzo pot. dig. (5K)
wiper1 = f4.DigitalPotResistanceToPosition(1, resistenza);
f4.DigitalPotSetWiperPosition(1, wiper1);
}
void freq3(float freq)
{
float resistenza = conv_freq4_5(freq);
//pot. 1
wiper0 = f4.DigitalPotResistanceToPosition(0, resistenza);
f4.DigitalPotSetWiperPosition(0, wiper0);
//pot. 2
wiper1 = f5.DigitalPotResistanceToPosition(1, resistenza);
f5.DigitalPotSetWiperPosition(1, wiper1);
}
void freq4(float freq)
{
float resistenza = conv_freq4_5(freq);
//pot. 1
wiper0 = f5.DigitalPotResistanceToPosition(0, resistenza);
f5.DigitalPotSetWiperPosition(0, wiper0);
//pot. 2
wiper1 = f6.DigitalPotResistanceToPosition(1, resistenza);
f6.DigitalPotSetWiperPosition(1, wiper1);
}
void amp1(int amp)
{
//wiper0 f6
wiper0 = f6.DigitalPotResistanceToPosition(0, amp);
f6.DigitalPotSetWiperPosition(0, wiper0);
}
void amp3(int amp)
{
//wiper1 f7
wiper1 = f7.DigitalPotResistanceToPosition(1, amp);
f7.DigitalPotSetWiperPosition(1, wiper1);
}
void amp2(float amp)
{
//wiper0 f7
wiper0 = f7.DigitalPotResistanceToPosition(0, amp);
f7.DigitalPotSetWiperPosition(0, wiper0);
}
void amp4(int amp)
{
//wiper0 f8
wiper0 = f8.DigitalPotResistanceToPosition(0, amp);
f8.DigitalPotSetWiperPosition(0, wiper0);
}
void amp5(int amp)
{
//wiper1 f8
wiper1 = f8.DigitalPotResistanceToPosition(1, amp);
f8.DigitalPotSetWiperPosition(1, wiper1);
}
void master_vol(int vol)
{
//wiper0 f9
wiper0= f9.DigitalPotResistanceToPosition(0, vol);
f9.DigitalPotSetWiperPosition(0, wiper0);
//wiper1 f9
wiper1= f9.DigitalPotResistanceToPosition(1, vol);
f9.DigitalPotSetWiperPosition(1, wiper1);
}
void cut_off(float ft)
{
}
void inviluppo(void)
{
//attacco a gradino
if(microsecatt == 0)
{
freq0(fr0);
freq1(fr1);
freq2(fr2);
freq3(fr3);
freq4(fr4);
amp1(a1);
amp2(a2);
amp3(a3);
amp4(a4);
amp5(a5);
master_vol(vol);
}
//attacco a rampa variabile
else
{
freq0(fr0);
freq1(fr1);
freq2(fr2);
freq3(fr3);
freq4(fr4);
amp1(a1);
amp2(a2);
amp3(a3);
amp4(a4);
amp5(a5);
while(vol!=0)
{
master_vol(vol--);
//delay(microsecatt);
}
}
//decay
while(vol>=0 && vol==mast_vol-5000)
{
master_vol(vol++);
//delay(1);
}
//sustan
delay(2000);
//relese
while(vol<=20000)
{
master_vol(vol++);
delay(1);
}
vol=0;
}
void loop() {
while((Serial.available())>0)
{
// se c'è qualche byte da leggere, allora...
char carattere=Serial.read(); // ...leggi byte
//if(carattere=='\r') continue;
if(carattere=='\n')
{
buffer[elemento_buffer]=0; // inserisco un carettere NULL per indicare la fine dell'array
elemento_buffer=0; // resetto l'indice dell'array
break; // esco dal ciclo while
}
buffer[elemento_buffer]=carattere; // creo l'array di caratteri
elemento_buffer++; // incremento l'indice del buffer
if(elemento_buffer==MAX_BUFFER) // se si raggiunge il limite di byte del buffer allora...
{
elemento_buffer=MAX_BUFFER-1; // ...sovrascrivi quello precedente
}
if(buffer[0] == 'a')
{
inviluppo();
Serial.println(buffer);
}
buffer[0]='0'; //pulisci buffer
}
}
/*void read_USB()
{
//interrompi l'inviluppo per suonare una nuova nota
if((Serial.available())>0)
{
if(buffer[0]=='a')
{
Serial.println(buffer);
inviluppo();
}
}
}*/
This target application is to implement a sinthetizer.
When i press ‘a’ ARDUINOUNO play a frequency with inviluppo() function, but the frequency
was played every 1 second without a trasmission of letter ‘a’, why? I don’t know.
I need to implement an ARDUINO application than play a note when I press ‘a’, but that does’t append, and I don’t know why.
Can you help me please to understand why it doesn’t append?
Thank you so much.
