1 Wire Pi

£12.99 each (including VAT: £15.59)

  • 1-Wire® to I2C host interface with ESD protection diode.
  • Stackable with other Raspberry Pi accessory boards.
  • Buffered 5V I2C port.
  • External 5V power input for 1-Wire® interface.

The 1 Wire Pi from AB Electronics is a communication board supporting the 1-Wire® protocol.  A 5V buffered I2C port is also provided on the board.

The 1-Wire Pi is pin compatible with the the Raspberry Pi model B+.

Introduction:

The 1-Wire® port is based around a DS2482-100 I2C to 1-Wire® bridge device.  The DS2482-100 provides bi-directional protocol conversion between the I2C port on the Raspberry Pi and any attached 1-Wire® slave devices.  An ESD Protection Diode is used to protect the 1 Wire Pi and Raspberry Pi from electrostatic spikes on the 1-Wire® port.  Connections to the 1-Wire® port can be made through the RJ-12 socket or the solder points on the PCB.  For details on configuring and using the 1-Wire® port on your Raspberry Pi click here.

A 5V input port is also provided allowing you to use an external power supply on the 1-Wire® interface, reducing the load on the Raspberry Pi.  If you choose to use the external 5V input please remove the jumper on the board to isolate the Raspberry Pi 5V bus.

Datasheets

1-Wire Pi Datasheet

DS2482S (1-Wire Interface)

Input Ratings & Specifications

Vdd (5V input pin): 5.0V

Maximum current on 1-Wire pins: ±20 mA

I2C SDA/SCL voltage: 5.0 V

I2C port current: 100 mA

Schematic

Click to download
Click to download schematic PDF.

Sample Code

The Quick2wire lib from https://github.com/quick2wire/quick2wire-python-api allows easy access to the I2C port via Python.

Configuring and using the 1-Wire® port on your Raspberry Pi

OWFS (One Wire File System) with I2C support on Raspberry Pi


Product Code: 1WirePi

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