Arduino AC 8CH Dimmer Lights

About: Electronic, Arduino, Raspberry, Photography, Model Train Entusiat

This project describes how to control with Arduino microcontroller an 8CH AC board by using zero-cross detection and firing angle method to dimm incandescent or alogen light bulbs and create light effects.

Warning: This project deals with AC electricity which is dangerous if you don’t know how to treat it safely.
You must treat electricity with caution!

Step 1: Prerequisites #1

The 8CH AC Module is a module with 8 Triacs with zero-cross detector for control the intensity of incandescent or alogen lamps through a microcontroller.

I used the Krida Electronics 8 CHANNEL DIGITAL LIGHT DIMMER V3 with zero-cross detector

(http://www.inmojo.com/store/krida-electronics/item... )

The board has the following main characteristics:

- Working AC voltage 80v to 240v

- Connected LOAD current for each channel 2A long-term, short-term 5A.
NOT appropriate to change the brightness of fluorescent lamps !!!

- Auto detect 50Hz or 60Hz.

- Zero-Cross detection (with zero/cross output pin SYNC).

- Low voltage side and high voltage side is completely isolated.

- Compatible with any ARDUINO, RASPBERRY boards.

Step 2: Prerequisites #2

For this project you need also:

Arduino microcontroller (I used Arduino UNO compatible board);

Some Dupont wires to connect the Arduino to the Krida terminals;

Some wires (1.5mm section) to connect the output load terminals of the 8CH AC Krida board to your incandescent or alogen lamps.

Wiring connection is available here:

https://drive.google.com/file/d/0B6GJokXFb5oETWFfd...

To connect Arduino board to the Krida board:

GND - > GND
VCC -> 5V

SYNC -> DIGITAL.3 (zero-cross detector output positive impulse - pulse length 200us)

CH1 -> DIGITAL.4

CH2 -> DIGITAL.5

CH3 -> DIGITAL.6

CH4 -> DIGITAL.7

CH5 -> DIGITAL.8

CH6 -> DIGITAL.9

CH7 -> DIGITAL.10

CH8 -> DIGITAL.11

To connect the Krida board to the AC power input and 8CH output:

AC INPUT -> AC voltage input 110/220 50-60Hz
AC LOAD -> Connect your load here for 1ch, 2ch, 3ch, 4ch, 5ch, 6ch, 7ch and 8ch (2A)

To power on the Krida board:

GND -> ground of low voltage side
VCC -> device power, DC 5 volts

Step 3: The Code

To obtain light effects (200V - 50Hz) as shown in the video the Arduino IDE code is provided:

https://create.arduino.cc/editor/Gianvi826/5c1c819...

#include
unsigned char channel_1 = 4; // Output to Opto Triac pin, channel 1 unsigned char channel_2 = 5; // Output to Opto Triac pin, channel 2 unsigned char channel_3 = 6; // Output to Opto Triac pin, channel 3 unsigned char channel_4 = 7; // Output to Opto Triac pin, channel 4 unsigned char channel_5 = 8; // Output to Opto Triac pin, channel 5 unsigned char channel_6 = 9; // Output to Opto Triac pin, channel 6 unsigned char channel_7 = 10; // Output to Opto Triac pin, channel 7 unsigned char channel_8 = 11; // Output to Opto Triac pin, channel 8 unsigned char CH1, CH2, CH3, CH4, CH5, CH6, CH7, CH8; unsigned char CHANNEL_SELECT; unsigned char i = 0; unsigned char clock_tick; // variable for Timer1 unsigned int delay_time = 50; unsigned int delay_time2 = 100; unsigned char low = 75; // luce massima unsigned char high = 55; // luce minima unsigned char off = 95; // totalmente accesa int lux = 75; // limite luce minima int lux2 = 85; // limite luce massima

unsigned char CH[] = {CH1, CH2, CH3, CH4, CH5, CH6, CH7, CH8};

void setup() {

// CH1=CH2=CH3=CH4=CH5=CH6=CH7=CH8=high;

pinMode(channel_1, OUTPUT);// Set AC Load pin as output pinMode(channel_2, OUTPUT);// Set AC Load pin as output pinMode(channel_3, OUTPUT);// Set AC Load pin as output pinMode(channel_4, OUTPUT);// Set AC Load pin as output pinMode(channel_5, OUTPUT);// Set AC Load pin as output pinMode(channel_6, OUTPUT);// Set AC Load pin as output pinMode(channel_7, OUTPUT);// Set AC Load pin as output pinMode(channel_8, OUTPUT);// Set AC Load pin as output attachInterrupt(1, zero_crosss_int, RISING); Timer1.initialize(100); // set a timer of length 100 microseconds for 50Hz or 83 microseconds for 60Hz; Timer1.attachInterrupt( timerIsr ); // attach the service routine here

}

void timerIsr() { clock_tick++;

if (CH1 == clock_tick) { digitalWrite(channel_1, HIGH); // triac firing delayMicroseconds(5); // triac On propogation delay (for 60Hz use 8.33) digitalWrite(channel_1, LOW); // triac Off }

if (CH2 == clock_tick) { digitalWrite(channel_2, HIGH); // triac firing delayMicroseconds(5); // triac On propogation delay (for 60Hz use 8.33) digitalWrite(channel_2, LOW); // triac Off }

if (CH3 == clock_tick) { digitalWrite(channel_3, HIGH); // triac firing delayMicroseconds(5); // triac On propogation delay (for 60Hz use 8.33) digitalWrite(channel_3, LOW); // triac Off }

if (CH4 == clock_tick) { digitalWrite(channel_4, HIGH); // triac firing delayMicroseconds(5); // triac On propogation delay (for 60Hz use 8.33) digitalWrite(channel_4, LOW); // triac Off }

if (CH5 == clock_tick) { digitalWrite(channel_5, HIGH); // triac firing delayMicroseconds(5); // triac On propogation delay (for 60Hz use 8.33) digitalWrite(channel_5, LOW); // triac Off }

if (CH6 == clock_tick) { digitalWrite(channel_6, HIGH); // triac firing delayMicroseconds(5); // triac On propogation delay (for 60Hz use 8.33) digitalWrite(channel_6, LOW); // triac Off }

if (CH7 == clock_tick) { digitalWrite(channel_7, HIGH); // triac firing delayMicroseconds(5); // triac On propogation delay (for 60Hz use 8.33) digitalWrite(channel_7, LOW); // triac Off }

if (CH8 == clock_tick) { digitalWrite(channel_8, HIGH); // triac firing delayMicroseconds(5); // triac On propogation delay (for 60Hz use 8.33) digitalWrite(channel_8, LOW); // triac Off }

}

void zero_crosss_int() // function to be fired at the zero crossing to dim the light { // Every zerocrossing interrupt: For 50Hz (1/2 Cycle) => 10ms ; For 60Hz (1/2 Cycle) => 8.33ms // 10ms=10000us , 8.33ms=8330us

clock_tick = 0; }

void loop() {

// CICLO 3 ********************************************************

for (i = lux; i < lux2; i++) { CH1 = i; delay(delay_time); }

for (i = lux2; i > lux; i--) { CH1 = i; delay(delay_time); }

for (i = lux; i < lux2; i++) { CH2 = i; delay(delay_time);

}

for (i = lux2; i > lux; i--) { CH2 = i; delay(delay_time); }

for (i = lux; i < lux2; i++) { CH3 = i; delay(delay_time); }

for (i = lux2; i > lux; i--) { CH3 = i; delay(delay_time); }

for (i = lux; i < lux2; i++) { CH4 = i; delay(delay_time); }

for (i = lux2; i > lux; i--) { CH4 = i; delay(delay_time); }

for (i = lux; i < lux2; i++) { CH5 = i; delay(delay_time); }

for (i = lux2; i > lux; i--) { CH5 = i; delay(delay_time); }

for (i = lux; i < lux2; i++) { CH6 = i; delay(delay_time); }

for (i = lux2; i > lux; i--) { CH6 = i; delay(delay_time); }

for (i = lux; i < lux2; i++) { CH7 = i; delay(delay_time); }

for (i = lux2; i > lux; i--) { CH7 = i; delay(delay_time); }

for (i = lux; i < lux2; i++) { CH8 = i; delay(delay_time); }

for (i = lux2; i > lux; i--) { CH8 = i; delay(delay_time); }

// ****************************************************************

// CICLO 4 *******************************************************

for (i = lux; i < lux2; i++) { CH7 = i; delay(delay_time);

}

for (i = lux2; i > lux; i--) { CH7 = i; delay(delay_time); }

for (i = lux2; i < 75; i++) { CH6 = i; delay(delay_time); }

for (i = lux2; i > lux; i--) { CH6 = i; delay(delay_time); }

for (i = lux; i < lux2; i++) { CH5 = i; delay(delay_time); }

for (i = lux2; i > lux; i--) { CH5 = i; delay(delay_time); }

for (i = lux; i < lux2; i++) { CH4 = i; delay(delay_time); }

for (i = lux2; i > lux; i--) { CH4 = i; delay(delay_time); }

for (i = lux; i < lux2; i++) { CH3 = i; delay(delay_time); }

for (i = lux2; i > lux; i--) { CH3 = i; delay(delay_time); }

for (i = lux; i < lux2; i++) { CH2 = i; delay(delay_time); }

for (i = lux2; i > lux; i--) { CH2 = i; delay(delay_time); }

// ****************************************************************

}

Step 4: AC Dimmer and More

You can use the 8CH Krida board also to control (sequencing) lights without dimming them.

In this scase no zero-crossing method was used and I made a K.I.T.T. Knight rider Effect

Here is the code:

// 8CH AC -
const int cb0=1; const int cb1=2; const int cb2=4; const int cb3=8; const int cb4=16; const int cb5=32; const int cb6=64; const int cb7=128; const int cb8=256; const int cb9=512;

void setup() { // initializzo i 10 piedini come uscite for (int i=4;i<12;i++) pinMode(i, OUTPUT); Serial.begin(9600); }

void Uscita(int valore) { if((valore&cb0)>0) digitalWrite(4,HIGH); else digitalWrite(4,LOW); if((valore&cb1)>0) digitalWrite(5,HIGH); else digitalWrite(5,LOW); if((valore&cb2)>0) digitalWrite(6,HIGH); else digitalWrite(6,LOW); if((valore&cb3)>0) digitalWrite(7,HIGH); else digitalWrite(7,LOW); if((valore&cb4)>0) digitalWrite(8,HIGH); else digitalWrite(8,LOW); if((valore&cb5)>0) digitalWrite(9,HIGH); else digitalWrite(9,LOW); if((valore&cb6)>0) digitalWrite(10,HIGH); else digitalWrite(10,LOW); if((valore&cb7)>0) digitalWrite(11,HIGH); else digitalWrite(11,LOW);

}

const int nro=23; int valo[nro]= { // elenco dei valori del foglio elettronico 1,3,7,14,28,56,112,224,448,896,768,512, 768,896,448,224,112,56,28,14,7,3,1 };

void loop() { for(int i=0; i

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