ds18b20 on attiny 1. series (3216, 1614, etc.) not works

Other Hardware Sensors
1

Hi. My DS18B20 works on atmega328p (three wires). When I wired ds18b20 on attiny 1. series, not works. Why? I used same library for ds18b20 (https://www.milesburton.com/Dallas_Temperature_Control_Library). I used also example from OneWire on DS18b20, also not works (on attiny328p this example works right)... Can you help me? Thanks.

2

Probably not defined properly in your code. Please post your code and a schematic, not a frizzy drawing and we will be able to help you.

3

This is scheme my circuit:

This is my code in Arduino IDE - it is modify "simple" example from library. On LCD display "error":

// Include the libraries we need
#include <OneWire.h>
#include <DallasTemperature.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x21,16,2); // set address & 16 chars / 2 lines

// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 14

// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);

/*

  • The setup function. We only start the sensors here
    */
    void setup(void)
    {
    lcd.begin(); // initialize the lcd
    lcd.clear(); // Print a message to the LCD.

// Start up the library
sensors.begin();
}

/*

  • Main function, get and show the temperature
    */
    void loop(void)
    {
    // call sensors.requestTemperatures() to issue a global temperature
    // request to all devices on the bus
    sensors.requestTemperatures(); // Send the command to get temperatures
    // After we got the temperatures, we can print them here.
    // We use the function ByIndex, and as an example get the temperature from the first sensor only.
    float tempC = sensors.getTempCByIndex(0);

// Check if reading was successful
if(tempC != DEVICE_DISCONNECTED_C)
{
lcd.setCursor(0, 0);
lcd.print(tempC);
}
else
{
lcd.setCursor(0, 0);
lcd.print("error");
}
}

4

LCD works right. All another equipment throught I2C works right. Only this DS18B20 not works. I have pin "14" right (it is pin 17 on SOIC20). I try all another pins also. Ucc on DS18B20 rights. I think, probably problem is on 1 wire bus. Attiny3216 works on default clock. I think, 3,33333 MHz. Prescaler is 6, default is 20 MHz internal. When I try 1000x function delaymilisecond(1000) on connected LED, approximately is 1 second. I do not know, where is mistake.

5

I found a library that works on AVR-1: GitHub - pstolarz/OneWireNg: Arduino 1-wire service library. OneWire compatible. Dallas thermometers support.
Everything is alright. :slight_smile:

6

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