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 expansion 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
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
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.
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
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:
Configuration 2:
Configuration 3:
Configuration 4:
