DAFFY-4 - 4 Relays output and 4 clean contacts input DIN rail I2C board

Features

• 4 relay output
  • Normaly open and normaly closed screw terminals
  • Panason ALQ112
  • 10A 250VAC
  • Surge 8,000 V, High breakdown voltage 4,000 V (Between contact and coil)
  • RC snubber circuitry on NO and NC contacts to suppress voltage transients
• 4 clean contact input
  • Electrostatic transient protections on each input
• I2C buffer
  • Bus speed up to 400-kHz
  • Input and output screw separate screw terminal
  • On-board repeater buffer between input and output terminals
• Pitch 5mm screw terminals for all signals
• Double Acme FPC six connector for WiFi controller and Acme Sensors boards
• Power in 12VDC
• DIN rail case (6 module)

I2C Addressing

Daffy-4 can use up to 8 different I2C addres setting the SW1 dip switch. The factory default address is 0x3F (all switch off)

Each board has a I2C bi-directional buffer that regenerates the bus voltage levels provided to the next board

Acme FPC Six pinout

Acme FPC is a expansion connector that will be used to extend the board features

How to manage the Daffy-4 board using a Raspberry-Pi an Acme Systems board or any other Linux embedded board

Enable the I2C bus at user level by following this article:

• How to manage the I2C buses

Scan the I2C devices

sudo apt install i2c-tools
sudo i2cdetect -y 1

i2cdetect -y 1

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- UU -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- -- 

Only the touch panel is present at address 0x5D

Wire and search the DAFFY-4 board on I2C-1 bus

Wire the Daffy-4 board on i2c bus 1 following this wiring:

Leave all the switch on SW1 at OFF and type:

i2cdetect -y 1

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 3f 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- UU -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- -- 

The daffy-4 is present now on address 0x3F and the address 0x5D is still used by the touch panel

Python examples

Let's try to manage the Daffy-4 using Python. Install the I2C Python library by typing:

sudo apt update
sudo apt install python-smbus

Then save this Python code inside a file called daffy.py:

import smbus
import time

DEVICE_BUS = 1 # /dev/i2c-1

# Board list
BOARD_ADDR=[56];

# Output value to send on each board
RELAY_OUT=[0x10,0x20,0x40,0x80,0x00];

Reg_InputPort =          0x00 # default 0x00
Reg_OutputPort =         0x01 # default 0xFF
Reg_PolarityInversion =  0x02 # default 0x00; polarity invert
Reg_Configuration =      0x03 # default 0xFF, 1 = input; 0 = output;

bus = smbus.SMBus(DEVICE_BUS)

for addr in BOARD_ADDR:
    print("Send configuration to board: " + "0x{:02x}".format(addr))
    bus.write_byte_data(addr, Reg_Configuration,0x0F)

while True:
    for addr in BOARD_ADDR:
        for relay_bitmap in RELAY_OUT:
            print("Send " + "0x{:02x}".format(relay_bitmap) + " to board " + hex(addr))
            bus.write_byte_data(addr, Reg_OutputPort,relay_bitmap)
            time.sleep(0.2);

Se the dip switch on this way:

Then type:

python daffy.py

If you have two or more boards add their address on this line:

BOARD_ADDR=[56,57,58];

and set the switch on each board:

Manage the Daffy-4 board using an ESP8266-12F

#include <WiFiClient.h>
#include <ESP8266WiFi.h>
#include <MQTT.h>
#include <PubSubClient.h>

#include <Wire.h>

//----SERIAL CONFIG ----
#define SERIAL_SPEED        115200

//----WIFI CONFIG ----
#define WIFI_SSID           "acmetest"
#define WIFI_PASSWD         "acmetest"
#define MAX_WIFI_INIT_RETRY 10
#define WIFI_RETRY_DELAY    500

//----MQTT CONFIG ----
#define MQTT_SERVER         "192.168.1.95"
#define MQTT_UNAME          ""
#define MQTT_PASSW          ""
#define MQTT_BROKER_PORT    1883          
#define MQTT_CLIENT_ID      "1234"

WiFiClient wifi_client;
PubSubClient mqtt_client(wifi_client, MQTT_SERVER, MQTT_BROKER_PORT);

//unsigned long delayTime;

//Wifi Initialization function
int WiFi_init()
{
  const char* wifi_ssid   = WIFI_SSID;
  const char* wifi_passwd = WIFI_PASSWD;

  int retries = 0;

  Serial.println("Connecting to WiFi AP..........");

  WiFi.mode(WIFI_STA); //set wifi station mode

  WiFi.begin(wifi_ssid, wifi_passwd); //start connecting to WiFi AP

  //check the status of WiFi connection to be WL_CONNECTED
  while ((WiFi.status() != WL_CONNECTED) && (retries < MAX_WIFI_INIT_RETRY)) {
    retries++;
    delay(WIFI_RETRY_DELAY);
    Serial.println("#");
  }
  Serial.println(String(WiFi.localIP()[0]) + "." + String(WiFi.localIP()[1]) + "." + String(WiFi.localIP()[2]) + "." + String(WiFi.localIP()[3]));

  return WiFi.status(); //return the WiFi connection status
}

void mqtt_callback(const MQTT::Publish& pub)
{
  Serial.println("MQTT receiving a message:");
  Serial.println(pub.payload_string());

  if (pub.payload_string()=="ON") {
    Wire.beginTransmission(0x38);
    Wire.write(0x03);
    Wire.write(0x0F);
    Wire.endTransmission();    // stop transmitting

    Wire.beginTransmission(0x38);
    Wire.write(0x01);
    Wire.write(0xF0);
    Wire.endTransmission();    // stop transmitting
  } else {
    Wire.beginTransmission(0x38);
    Wire.write(0x03);
    Wire.write(0x0F);
    Wire.endTransmission();    // stop transmitting

    Wire.beginTransmission(0x38);
    Wire.write(0x01);
    Wire.write(0x00);
    Wire.endTransmission();    // stop transmitting
  }

}

void setup() {
  Serial.begin(SERIAL_SPEED);
  Wire.begin();
  delay(100);

  Serial.println("Program Start");

  Wire.begin();
  Wire.write(0x03);
  Wire.write(0x0F);

  // WiFi
  while(true) {
    Serial.println("WiFi try");
    if (WiFi_init()==WL_CONNECTED) {
      Serial.println("WiFi success");
      break;
    }

    Serial.println("WiFi failed");
    delay(1000);
  }

  // MQTT
  while(true) {
    Serial.println("MQTT try");

    if (mqtt_client.connect(MQTT::Connect(MQTT_CLIENT_ID).set_keepalive(90).set_auth(String(MQTT_UNAME), String(MQTT_PASSW)))) {
      mqtt_client.set_callback(mqtt_callback); //set callback on received messages
      mqtt_client.set_max_retries(255);
      if (mqtt_client.subscribe("/daffy/relay")) {
        Serial.println("Subscription success");
        break;
      } else {
        Serial.println("Subscription failed");
        mqtt_client.disconnect();
        delay(1000);
        continue;
      }
    } else {
      delay(1000);
      continue;
    }
  }
}

void loop() {
  char payload[20];

  //sprintf(payload,"Start");
  //mqtt_client.publish("/daffy/input", payload);

  if (mqtt_client.connected()) {
        mqtt_client.loop();
  }
}

Datasheet

• Relay Panasonic ALQ112
• Texas Instruments TCA9534A Low Voltage 8-Bit I2C and SMBUS Low-Power I/O Expander With Interrupt