Partea cea mai complicata si cea mai periculoasa, care detecteaza trecerea prin zero a tensiunii retelei si, care comanda triacul, se gaseste in articolul Variator de tensiune pentru bec folosind un Arduino:
In articolele Variator de tensiune pentru un bec cu Arduino (II), Variator de tensiune pentru bec cu Arduino (III) si Variator de tensiune pentru bec cu Arduino (IV) am prezentat mai multe experimente, iar schema de baza ar fi ca cea de mai jos, fara LED-ul RGB:
Eu am conectat si afisajul LCD la pinii 8..13 obtinand:
- bec stins (0%):
- treapta 1 (6%):
- treapta 2-a (13%):
- treapta 3-a (19%):
- treapta 4-a (25%):
- treapta 5-a (31%):
- treapta 6-a (38%):
- treapta 7-a (44%):
- treapta 8-a (50%):
- treapta 9-a (57%):
- treapta 10-a (63%):
- treapta 11-a (69%):
- treapta 12-a (75%):
- treapta 13-a (82%):
- treapta 14-a (88%):
- treapta 15-a (94%):
- treapta 16-a (100%), adica maxim:
Si sa "raman in continuare om serios" va arat si programiorul folosit / sketch-ul):
/*
AC Light Control
Updated by Robert Twomey <rtwomey@u.washington.edu>
Thanks to http://www.andrewkilpatrick.org/blog/?page_id=445
and http://www.hoelscher-hi.de/hendrik/english/dimmer.htm
adapted sketch by niq_ro from
http://www.tehnic.go.ro
http://www.niqro.3x.ro
http://nicuflorica.blogspot.com
*/
#include <LiquidCrystal.h>
// use LiquidCrystal.h library for alphanumerical display 1602
LiquidCrystal lcd(13,12,11,10,9,8);
/* -------------------
| LCD | Arduino |
-------------------
LCD RS pin to digital pin 13 | RS | D13 |
LCD Enable pin to digital pin 12 | E | D12 |
LCD D4 pin to digital pin 11 | D4 | D11 |
LCD D5 pin to digital pin 10 | D5 | D10 |
LCD D6 pin to digital pin 9 | D6 | D9 |
LCD D7 pin to digital pin 8 | D7 | D8 |
LCD R/W pin to ground | R/W | GND |
-------------------
*/
#include <TimerOne.h> // Avaiable from http://www.arduino.cc/playground/Code/Timer1
volatile int i=0; // Variable to use as a counter
volatile boolean zero_cross=0; // Boolean to store a "switch" to tell us if we have crossed zero
int AC_pin = 3; // Output to Opto Triac
int buton1 = 4; // first button at pin 4
int buton2 = 5; // second button at pin 5
int dim2 = 0; // led control
int dim = 128; // Dimming level (0-128) 0 = on, 128 = 0ff
int pas = 8; // step for count;
// version: 4m7 (15.04.2013 - Craiova, Romania) - 16 steps, 4 button & LED blue to red (off to MAX)
// version: 7m3 (22.01.2014 - Craiova, Romania) - 16 steps, 2 button & LCD1602
int freqStep = 75; // This is the delay-per-brightness step in microseconds.
void setup() { // Begin setup
Serial.begin(9600);
pinMode(buton1, INPUT); // set buton1 pin as input
pinMode(buton2, INPUT); // set buton1 pin as input
pinMode(AC_pin, OUTPUT); // Set the Triac pin as output
attachInterrupt(0, zero_cross_detect, RISING); // Attach an Interupt to Pin 2 (interupt 0) for Zero Cross Detection
Timer1.initialize(freqStep); // Initialize TimerOne library for the freq we need
Timer1.attachInterrupt(dim_check, freqStep);
// Use the TimerOne Library to attach an interrupt
lcd.begin(16, 2); // set up the LCD's number of columns and rows:
lcd.clear(); // clear the screen
lcd.setCursor(2, 0); // put cursor at colon 0 and row 0
lcd.print("16 steps AC"); // print a text
lcd.setCursor(0, 1); // put cursor at colon 0 and row 1
lcd.print("dimmer for bulb"); // print a text
delay (3000);
lcd.clear(); // clear the screen
lcd.setCursor(1, 0); // put cursor at colon 0 and row 0
lcd.print("this sketch is"); // print a text
lcd.setCursor(1, 1); // put cursor at colon 0 and row 1
lcd.print("made by niq_ro"); // print a text
delay (3000);
lcd.clear(); // clear the screen
}
void zero_cross_detect() {
zero_cross = true; // set the boolean to true to tell our dimming function that a zero cross has occured
i=0;
digitalWrite(AC_pin, LOW);
}
// Turn on the TRIAC at the appropriate time
void dim_check() {
if(zero_cross == true) {
if(i>=dim) {
digitalWrite(AC_pin, HIGH); // turn on light
i=0; // reset time step counter
zero_cross=false; // reset zero cross detection
}
else {
i++; // increment time step counter
}
}
}
void loop() {
digitalWrite(buton1, HIGH);
digitalWrite(buton2, HIGH);
if (digitalRead(buton1) == LOW)
{
if (dim<127)
{
dim = dim + pas;
if (dim>127)
{
dim=127;
}
}
}
if (digitalRead(buton2) == LOW)
{
if (dim>5)
{
dim = dim - pas;
if (dim<0)
{
dim=1;
}
}
}
while (digitalRead(buton1) == LOW) { }
delay(10); // waiting little bit...
while (digitalRead(buton2) == LOW) { }
delay(10); // waiting little bit...
dim2 = 255-2*dim;
if (dim2<0)
{
dim2 = 0;
}
Serial.print("dim=");
Serial.print(dim);
Serial.print(" dim2=");
Serial.print(dim2);
Serial.print(" dim1=");
Serial.print(2*dim);
Serial.print('\n');
delay (100);
lcd.setCursor(2, 0); // put cursor at colon 0 and row 0
lcd.print("power is "); // print a text
lcd.print(100-100*(255-dim2)/255);
lcd.print("% "); // print a text
lcd.setCursor(1, 1); // put cursor at colon 0 and row 1
lcd.print("dim. level="); // print a text
lcd.print(dim);
lcd.print(" "); // print a text
}
- ac light dimmer with Arduino (XVII)
Deoarece am constatat ca la tastarea pentru cresterea sau scaderea intensitatii luminoase, mai apar erori la numarul minim sau maxim, am corectat sketch-ul in 2 locuri:
if (dim>127)
{
dim=128; // in vechiul sketch era 127
}
if (dim<0)
{
dim=0; // in vechiul sketch era 1
}
24.01.2014
Am desenat si schema de comectare completa:
Atat circuitul cat si softul e superb. As vrea sa folosesc acest circuit pentru a comanda puterea unui aparat de pirogravat. Este posibil extinderea numarului de trepti de putere? Multumesc.
RăspundețiȘtergere