Description

This SnipCard can handle two 1-Wire channels or one I2CBUS channel. The card is designed to fit specific components for two opto-isolated outputs (optional mode).

The 1-Wire devices made by Dallas Semiconductor, of which the Seletronica uses the iButton buttons as personal identification device, provide a wide range of products (temperature sensors, actuators, identification devices with unique code etc. …). All these devices can be connected to the same serial bus (two-wire), which allows to easily extend the number of sensors for data acquisition.

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1-Wire / I2C bus base board connections

1WIRE I2CBUS SnipCard connections

1WIRE I2CBUS SnipCard connections

Technical specifications

  • OUTPUT A:
  • 1-WIRE 1 (or SCL)
  • OUTPUT B:
  • 1-WIRE 2 (or SDA)
  • COM PLUG:
  • GND

1-Wire Code example

#include <Archiduino.h>
#include <pins_archiduino.h>
#include <DallasTemperature.h>
#include <OneWire.h>
#include <LiquidCrystal.h>
#include <ArchiduinoLcd.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h>

#define ONE_WIRE_BUS M8B
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

ArchiduinoLcd_PCF lcd;        // set the LCD address to 0x20 for a 16 chars and 2 line display

int KeyboardPin = PB4;        // select the input pin of lcd-keyboard
int KeyboardValue;            // variable to store the value coming from the keyboard
int ledPin = LED_RUN;         // select the pin for the LED
bool ledStatus;
int rele = RELE_11;
int setupStatus = 0;          // flag to 1 if setup mode is active
float setTemp = 30;
float readTemp = 0;

void setup() {  
 
  delay(200);  
  lcd.init();                      // initialize the lcd 
  lcd.begin(16, 2);                // initialize lcd and keyboard
  lcd.clear();
  
  sensors.begin();
  
  lcd.backlight();
  lcd.print("   ARCHIDUINO   ");
  lcd.setCursor(0, 1);
  lcd.print("  TEST DS18B20   ");
  delay(1000);
  lcd.clear();

  pinModeEx(rele, OUTPUT);
  pinMode(M7A, OUTPUT);
  pinMode(M7B, OUTPUT);
  
}


void loop(void) { 

  readKey();
 
  if (setupStatus == 0) {
    readTemp = sensors.getTempCByIndex(0);
    sensors.requestTemperatures(); 
    lcd.setCursor(0, 0); 
    lcd.print("PROBE: ");
    lcd.print (readTemp, 1);
    lcd.print( (char) 223 );   // Degree symbol '°'
    lcd.print ("C"); 
  }
  
  stampaSoglia();
  
  if (readTemp >= setTemp) {
    digitalWriteEx(rele, LOW);
    digitalWrite(M7A, HIGH);   
    lcd.ledOff();
  }else{ 
    digitalWriteEx(rele, HIGH);
    digitalWrite(M7A, LOW);  
   lcd.ledOn(); 
  }
 
}

void readKey() {
  
  KeyboardValue = analogRead(KeyboardPin);    
 
  if(lcd.IsButton1Pressed() && setupStatus == 1){
    lcd.setCursor(0,0);
    lcd.print ("SETUP COMPLETE  ");
    delay(500);  
    lcd.setCursor(0,0);
    lcd.print ("              ");  
    setupStatus = 0;
  } 
  
  if(lcd.IsButton2Pressed() && setupStatus == 1){
    setTemp -= 0.1;
    stampaSoglia();
    delay(100);
  } 

  if(lcd.IsButton3Pressed() && setupStatus == 1){
    setTemp += 0.1;
    stampaSoglia();
    delay(40);
  } 
  
  if(lcd.IsButton4Pressed() && setupStatus == 0){  // ENTERING SETUP
    delay(500);
    setupStatus = 1;
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print ("SETUP");
    stampaSoglia();
    delay(40);
  } 
  
}

void stampaSoglia() {
    lcd.setCursor(0, 1); 
    lcd.print("THRES. : ");
    lcd.print (setTemp, 1);
    lcd.print( (char) 223 );   // Degree symbol '°'
    lcd.print ("C");  
}

void ledBlink() {
  
  if (ledStatus==0)
  {
    ledStatus = 1;
    lcd.ledOn();      //led run on
  }
  else
  {
    ledStatus = 0;
    lcd.ledOff();    //led run off
  }
  delay(100);  

}

Attachments

1WIRE / I2C SnipCard - Schematic
Title: SM_UPC_COM_V1_Schematic 1-Wire (331 clicks)
Caption: 1WIRE / I2C SnipCard - Schematic
Filename: sm_upc_com_v1_schematic-1-wire.pdf
Size: 287 KB

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