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How to Use DS2484 I2C to 1-Wire Bus Adapter Breakout: Examples, Pinouts, and Specs

Image of DS2484 I2C to 1-Wire Bus Adapter Breakout
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Introduction

The DS2484 is a specialized interface designed to bridge the gap between an I2C bus and a 1-Wire network. Manufactured by Adafruit, this breakout board simplifies the integration of 1-Wire devices, such as temperature sensors, EEPROMs, and other peripherals, into microcontroller-based systems. By utilizing the DS2484, users can connect multiple 1-Wire devices to a microcontroller via the I2C protocol, reducing the complexity of direct 1-Wire communication.

Explore Projects Built with DS2484 I2C to 1-Wire Bus Adapter Breakout

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!
ESP32-Based Industrial Control System with RS485 Communication and I2C Interface
Image of DRIVER TESTER : A project utilizing DS2484 I2C to 1-Wire Bus Adapter Breakout in a practical application
This circuit integrates a microcontroller with a display, digital potentiometer, IO expander, and opto-isolator board for signal interfacing and isolation. It includes a UART to RS485 converter for serial communication and a power converter to step down voltage for the system. The circuit is designed for control and communication in an isolated and protected environment.
Cirkit Designer LogoOpen Project in Cirkit Designer
I2C LCD Display Module with Power Supply Interface
Image of J8 +j22 lcd closeup: A project utilizing DS2484 I2C to 1-Wire Bus Adapter Breakout in a practical application
This circuit interfaces a 20x4 I2C LCD display with a power source and an I2C communication bus. The LCD is powered by a 4.2V supply from a connector and communicates via I2C through another connector, which provides the SCL and SDA lines as well as ground.
Cirkit Designer LogoOpen Project in Cirkit Designer
Raspberry Pi 4B-Based Current Monitoring System with I2C OLED Display
Image of Virtual Energy Monitoring Circuit: A project utilizing DS2484 I2C to 1-Wire Bus Adapter Breakout in a practical application
This circuit features a Raspberry Pi 4B as the central processing unit, interfaced with an Adafruit ADS1115 16-bit I2C ADC for analog-to-digital conversion and a 0.96" OLED display for visual output. The ADS1115 is connected to a current sensor for measuring electrical current, with the sensor's output and burden pins connected to the ADC's analog input channels. The Raspberry Pi communicates with both the ADC and the OLED display over the I2C bus, using its GPIO2 and GPIO3 pins for data (SDA) and clock (SCL) lines, respectively.
Cirkit Designer LogoOpen Project in Cirkit Designer
Wi-Fi Enabled Sensor Hub with ESP8266 and ADS1115 ADC
Image of Node Mcu Gas Sensor: A project utilizing DS2484 I2C to 1-Wire Bus Adapter Breakout in a practical application
This circuit features two ESP8266 NodeMCU microcontrollers, each interfaced with a Gravity I2C ADS1115 16-Bit ADC module for analog-to-digital conversion. The microcontrollers communicate with the ADC modules via I2C protocol, with one set of connections for each microcontroller-ADC pair, and are powered through a common 3.3V and ground connection.
Cirkit Designer LogoOpen Project in Cirkit Designer

Explore Projects Built with DS2484 I2C to 1-Wire Bus Adapter Breakout

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!
Image of DRIVER TESTER : A project utilizing DS2484 I2C to 1-Wire Bus Adapter Breakout in a practical application
ESP32-Based Industrial Control System with RS485 Communication and I2C Interface
This circuit integrates a microcontroller with a display, digital potentiometer, IO expander, and opto-isolator board for signal interfacing and isolation. It includes a UART to RS485 converter for serial communication and a power converter to step down voltage for the system. The circuit is designed for control and communication in an isolated and protected environment.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of J8 +j22 lcd closeup: A project utilizing DS2484 I2C to 1-Wire Bus Adapter Breakout in a practical application
I2C LCD Display Module with Power Supply Interface
This circuit interfaces a 20x4 I2C LCD display with a power source and an I2C communication bus. The LCD is powered by a 4.2V supply from a connector and communicates via I2C through another connector, which provides the SCL and SDA lines as well as ground.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of Virtual Energy Monitoring Circuit: A project utilizing DS2484 I2C to 1-Wire Bus Adapter Breakout in a practical application
Raspberry Pi 4B-Based Current Monitoring System with I2C OLED Display
This circuit features a Raspberry Pi 4B as the central processing unit, interfaced with an Adafruit ADS1115 16-bit I2C ADC for analog-to-digital conversion and a 0.96" OLED display for visual output. The ADS1115 is connected to a current sensor for measuring electrical current, with the sensor's output and burden pins connected to the ADC's analog input channels. The Raspberry Pi communicates with both the ADC and the OLED display over the I2C bus, using its GPIO2 and GPIO3 pins for data (SDA) and clock (SCL) lines, respectively.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of Node Mcu Gas Sensor: A project utilizing DS2484 I2C to 1-Wire Bus Adapter Breakout in a practical application
Wi-Fi Enabled Sensor Hub with ESP8266 and ADS1115 ADC
This circuit features two ESP8266 NodeMCU microcontrollers, each interfaced with a Gravity I2C ADS1115 16-Bit ADC module for analog-to-digital conversion. The microcontrollers communicate with the ADC modules via I2C protocol, with one set of connections for each microcontroller-ADC pair, and are powered through a common 3.3V and ground connection.
Cirkit Designer LogoOpen Project in Cirkit Designer

Common Applications and Use Cases

  • Temperature Monitoring: Interfacing with 1-Wire temperature sensors like the DS18B20.
  • Data Logging: Connecting 1-Wire EEPROMs for data storage.
  • Industrial Automation: Managing multiple 1-Wire devices in a robust and scalable manner.
  • Home Automation: Integrating 1-Wire sensors for smart home applications.

Technical Specifications

The DS2484 breakout board is designed to provide reliable communication between I2C and 1-Wire devices. Below are its key technical details:

Key Technical Details

  • I2C Voltage Range: 2.9V to 5.5V
  • 1-Wire Voltage Range: 2.9V to 5.5V
  • I2C Address: Configurable via jumpers (default: 0x18)
  • Operating Temperature: -40°C to +85°C
  • Communication Protocols: I2C for host communication, 1-Wire for peripheral devices
  • Pull-Up Resistors: Integrated 1-Wire pull-up resistor (can be disabled via jumper)
  • Dimensions: Compact breakout board for easy integration

Pin Configuration and Descriptions

The DS2484 breakout board features the following pins:

Pin Name Type Description
VIN Power Input Input voltage for the breakout board (2.9V to 5.5V).
GND Ground Ground connection.
SDA I2C Data Line Serial data line for I2C communication.
SCL I2C Clock Line Serial clock line for I2C communication.
1W 1-Wire Bus Connection to the 1-Wire network.
ADDR Address Select Configures the I2C address (default: 0x18).
INT Interrupt Optional interrupt pin for advanced applications (not required for basic use).

Usage Instructions

The DS2484 breakout board is straightforward to use in a circuit. Follow the steps below to integrate it into your project:

Step 1: Wiring the DS2484

  1. Power the Board: Connect the VIN pin to a 3.3V or 5V power source and the GND pin to ground.
  2. I2C Connection: Connect the SDA and SCL pins to the corresponding I2C pins on your microcontroller.
  3. 1-Wire Connection: Attach the 1W pin to your 1-Wire network. Ensure that all 1-Wire devices share a common ground with the DS2484.
  4. Optional Address Configuration: If using multiple DS2484 devices, configure the I2C address by adjusting the ADDR pin.

Step 2: Using the DS2484 with an Arduino UNO

The DS2484 is compatible with Arduino boards. Below is an example of how to use the DS2484 to read data from a 1-Wire temperature sensor (e.g., DS18B20).

Example Code

#include <Wire.h>
#include <OneWire.h>
#include <DS2484.h>

// Create an instance of the DS2484 library
DS2484 ds2484;

// Define the 1-Wire bus pin (connected to the DS2484 breakout)
OneWire oneWire(10); // Pin 10 is used for the 1-Wire bus

void setup() {
  Serial.begin(9600);
  Wire.begin(); // Initialize I2C communication

  // Initialize the DS2484
  if (!ds2484.begin()) {
    Serial.println("Failed to initialize DS2484. Check connections.");
    while (1); // Halt execution if initialization fails
  }
  Serial.println("DS2484 initialized successfully.");

  // Initialize the 1-Wire bus
  oneWire.begin();
}

void loop() {
  byte addr[8];

  // Search for 1-Wire devices
  if (oneWire.search(addr)) {
    Serial.print("1-Wire device found: ");
    for (int i = 0; i < 8; i++) {
      Serial.print(addr[i], HEX);
      if (i < 7) Serial.print(":");
    }
    Serial.println();
  } else {
    Serial.println("No 1-Wire devices found.");
    oneWire.reset_search(); // Reset the search for the next loop
  }

  delay(1000); // Wait 1 second before the next search
}

Important Considerations and Best Practices

  • Pull-Up Resistors: Ensure that the 1-Wire bus has a proper pull-up resistor (typically 4.7kΩ). The DS2484 breakout includes an integrated pull-up resistor, which can be disabled if an external resistor is preferred.
  • I2C Address Conflicts: If using multiple I2C devices, ensure that each device has a unique address. Adjust the ADDR pin on the DS2484 if necessary.
  • Power Supply: Verify that the power supply voltage matches the requirements of both the DS2484 and the connected 1-Wire devices.

Troubleshooting and FAQs

Common Issues and Solutions

  1. DS2484 Not Detected on I2C Bus

    • Cause: Incorrect wiring or I2C address conflict.
    • Solution: Double-check the SDA and SCL connections. Ensure the ADDR pin is configured correctly.
  2. 1-Wire Devices Not Responding

    • Cause: Missing or incorrect pull-up resistor on the 1-Wire bus.
    • Solution: Verify that the 1-Wire bus has a 4.7kΩ pull-up resistor. If using the DS2484's internal pull-up, ensure it is enabled.
  3. Intermittent Communication Failures

    • Cause: Noise or insufficient power supply.
    • Solution: Use decoupling capacitors near the DS2484 and ensure a stable power source.

FAQs

  • Q: Can I use the DS2484 with a 3.3V microcontroller?

    • A: Yes, the DS2484 supports both 3.3V and 5V logic levels.
  • Q: How many 1-Wire devices can I connect to the DS2484?

    • A: The DS2484 supports multiple 1-Wire devices, but the exact number depends on the power supply and bus length.
  • Q: Is the DS2484 compatible with Raspberry Pi?

    • A: Yes, the DS2484 can be used with Raspberry Pi via the I2C interface. Ensure proper I2C configuration on the Raspberry Pi.

By following this documentation, you can effectively integrate the DS2484 I2C to 1-Wire Bus Adapter Breakout into your projects for seamless communication with 1-Wire devices.