Hi PaulS
thanks for help, may be "a strang car again" sorry, I am new for using farum.
the hardware I am using, I explained before here: guitar frequencies - #15 by system - Programming Questions - Arduino Forum
I get some code from this public domain: Tony Chai wrote by Tony Chai
I don,t need to to use servo or tuning peg, indstead I am using electromegnet and coils to vibrate the string, just visualizing frequency. my vibration hardware circuit I put here
here is the code
/*
* Magic_Tune
*
* This program will receive an amplified analog signal, compare the pitch, and control the servo motor while displaying output LEDs
*/
//Libraries required for servo control and usage of the Atmega’s internal timer
#include
#include "WProgram.h"
//Global variables to be used
int x;
int y;
int lastx;
int lasty;
long timer;
int idle_timer;
int threshold;
int cross_count;
int in_tune;
int average_val;
int pitch_diff;
int upper_bound;
int lower_bound;
int avg_cross;
int avg_counter;
int avg_upper;
int avg_lower;
float a, b;
int timer_divide;
int divide_by;
int string_select;
int select_pin_val;
int analogPin = 0; // analog to digital pin for signal input
int led_high = 13; // this LED will show user if a string's pitch is too high
int led_ok = 12; // this LED will show user if a string's pitch is correct
int led_low = 11; // this LED will show user if a string's pitch is too low
// these pins will light up to show which string the Atmega is comparing values for
int led_e4 = 10;
int led_b3 = 9;
int led_g3 = 8;
int led_d3 = 7;
int led_a2 = 6;
int led_e2 = 5;
int button_pin = 3; // input pin for user using a button to switch strings
int servoPin = 2; // control pin for servo motor
void setup()
{
// Set up timer 1 to generate an interrupt every 1 microsecond
TCCR1A = 0x00;
TCCR1B = (_BV(WGM12) | _BV(CS12));
OCR1A = .071;
TIMSK1 = _BV(OCIE1A);
x = 0;
lastx = 0;
y = 0;
lasty = 0;
timer = 0;
cross_count = 0;
avg_cross = 0;
avg_counter = 0;
string_select = 0;
//Set the input and output pins
pinMode(button_pin, INPUT);
pinMode(servoPin, OUTPUT);
pinMode(led_high, OUTPUT);
pinMode(led_ok, OUTPUT);
pinMode(led_low, OUTPUT);
pinMode(led_e4, OUTPUT);
pinMode(led_b3, OUTPUT);
pinMode(led_g3, OUTPUT);
pinMode(led_d3, OUTPUT);
pinMode(led_a2, OUTPUT);
pinMode(led_e2, OUTPUT);
Serial.begin(9600); // Opens serial port, sets data rate to 9600 bps
}
// Nothing is done in the Arduino loop, since timing is off.
void loop()
{
}
// Timer function running every microsecond
ISR(TIMER1_COMPA_vect)
{
timer++;
idle_timer++;
// Read button press to determine which string is to be detected
if (timer % 100 == 0)
{
select_pin_val = digitalRead(button_pin);
if (select_pin_val == HIGH)
{
string_select = ((string_select + 1) % 6);
Serial.print("string: ");
Serial.println(string_select);
}
}
// Depending on which string is selected, the proper variables are set
switch (string_select)
{
case 0:
digitalWrite(led_e4, LOW); // sets the proper LED on, all else off
digitalWrite(led_b3, LOW);
digitalWrite(led_g3, LOW);
digitalWrite(led_d3, LOW);
digitalWrite(led_a2, LOW);
digitalWrite(led_e2, HIGH);
a = 0.045;
b = 0.9099;
threshold = 150;
upper_bound = 77;
lower_bound = 33;
avg_upper = 57;
in_tune = 55; // This is the “in tune” average of cross counts for the string.
avg_lower = 53;
timer_divide= 2000;
divide_by = 3;
break;
case 1:
digitalWrite(led_e4, LOW); // sets the proper LED on, all else off
digitalWrite(led_b3, LOW);
digitalWrite(led_g3, LOW);
digitalWrite(led_d3, LOW);
digitalWrite(led_a2, HIGH);
digitalWrite(led_e2, LOW);
a = 0.0592;
b = 0.8816;
threshold = 150;
upper_bound = 88;
lower_bound = 44;
avg_upper = 67;
in_tune = 65; // This is the “in tune” average of cross counts for the string.
avg_lower = 63;
timer_divide = 2000;
divide_by = 3;
break;
case 2:
digitalWrite(led_e4, LOW); // sets the proper LED on, all else off
digitalWrite(led_b3, LOW);
digitalWrite(led_g3, LOW);
digitalWrite(led_d3, HIGH);
digitalWrite(led_a2, LOW);
digitalWrite(led_e2, LOW);
a = 0.0797;
b = 0.8406;
threshold = 150;
upper_bound = 117;
lower_bound = 63;
avg_upper = 97;
in_tune = 95; // This is the “in tune” average of cross counts for the string.
avg_lower = 93;
timer_divide = 2000;
divide_by = 3;
break;
I have to divede the code two parts because I cant put here all- the next is ather part of the code-
see the circuit image
