The AB Electronics UK Knowledge Base provides support solutions, tutorials and troubleshooting guides.
This item has been replaced with the 1 Wire Pi Plus and 1 Wire Pi Zero.
- 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.
The 1 Wire Pi from AB Electronics UK is a communication board supporting the 1-Wire® protocol. A 5V buffered I2C port is also provided on the board.
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® devices. An ESD Protection Diode protects 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. See our KB page for configuring and using the 1-Wire® port on your Raspberry Pi.
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 use the external 5V input, please remove the jumper on the board to isolate the Raspberry Pi 5V bus.
Datasheets
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
Mechanical Drawings
Click the image to enlarge
Sample Code
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