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1 Wire Pi Zero

1 Wire interface development board for the Raspberry Pi Zero

General Info Technical Details Code Libraries and Tutorials
 

Features

  • 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 the 1-Wire® interface.
  • I2C address selection via solder jumpers.

The 1 Wire Pi Zero from AB Electronics UK is a communication board supporting the 1-Wire® protocol designed for use on the Raspberry Pi Zero and other compatible single-board computers.  A 5V buffered I2C port is also provided on the board.  Using our mounting kit pack, the 1 Wire Pi Zero can be securely fitted to your Raspberry Pi.

The 1-Wire® port on the 1 Wire Pi Zero 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® devices.  An ESD Protection Diode protects the 1 Wire Pi Zero 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.  We have a knowledge base article for configuring and using the 1-Wire® port on your Raspberry Pi.

The 1 Wire Pi Zero is powered through the host Raspberry Pi using the GPIO port, and extended pins on the GPIO connector allow you to stack the 1 Wire Pi Zero along with other development boards.

A 5V input port allows 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 solder jumper on the board to isolate the Raspberry Pi 5V bus.

Technical Details

Input Ratings & Specifications

Spec
Ratings
Vdd (5V pin)
5.0V
Maximum current on 1-Wire pins
±20 mA
I2C SDA/SCL voltage
5.0 V
I2C port current
100 mA

3D CAD Model

Click to download1 Wire Pi Zero - 3D CAD File (STEP Format)

Schematic

View to download
View schematic PDF.

Mechanical Drawings

Mechanical Drawing

Click image to enlarge

Compatibility

We have tested the 1 Wire Pi Zero on the following platforms.

Model Status
Raspberry Pi Model A / B
Raspberry Pi 1 Model A+ / B+
Raspberry Pi 2 Model B
Raspberry Pi 3 Model A+ / B / B+
Raspberry Pi 4 Model B
Raspberry Pi 5
Raspberry Pi Zero
Raspberry Pi Zero W / Zero 2 W
Raspberry Pi Compute Module 4 IO Board
Raspberry Pi 400
Orange Pi
Asus Tinker Board
Odroid

Assembly Instructions

This product requires a soldering iron and solder to fit the connectors.

The 1 Wire Pi Zero is supplied with the 40-pin GPIO connector, RJ12 connector, and 2-pin jumper unsoldered. 

Before using the 1 Wire Pi Zero, you need to solder the two connectors onto the PCB.  We suggest soldering the 40-pin GPIO connector first and then the RJ12 connector.  The RJ12 connector is supplied clipped onto the PCB.

PCB Header Assembly Jig

Download and print our PCB Header Assembly Jig to hold your circuit board when soldering the header pins.

PCB assembly jig

Connecting to the 1-Wire® Port

The 1-Wire® port on the 1-Wire Pi can be accessed through the female RJ12 socket or the solder points on the PCB.  An ESD protection diode is fitted between the RJ12 port and the 1-Wire® interface IC.

The pinout connections for the RJ12 port are shown below:

Pin
Usage
1
5V
2
Ground
3
OW (1-Wire® Data, ESD Protected)
4
RT (1-Wire® Return/Ground, ESD Protected)
5
NC
6
NC

RJ12 Port

I2C Address Selection

The 1 Wire Pi Zero includes two address selection solder jumpers which can be bridged with solder to give you up to 4 different I2C addresses.

Configuration 1:

Address 0x18

Configuration 2:

Address 0x19

Configuration 3:

Address 0x1A

Configuration 4:

Address 0x1B

Datasheets

DS2482S (1-Wire Interface)

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Important Information

This development board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by abelectronics.co.uk to be a finished end-product fit for general consumer use. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. Persons handling the product(s) must have electronics training and observe good engineering practice standards. This development board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives. Note: documents in Portable Document Format (PDF) require Adobe Acrobat Reader 5.0 or higher to view, download Adobe Acrobat Reader or other PDF reading software for your computer or mobile device.

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