These are KiCad schematics and project files for a 1-Wire Bus Master module, capable of mastering 8 1-Wire busses.
This module is meant to be connected to, and driven by, a host uC, such as a Raspberry Pi or an Arduino. The host uC must be capable of I2C communication.
The module is powered by the Maxim DS2482 1-Wire bus master chip.
- Break-out of 8 1-Wire busses from the DS2482
- Screw terminal connectors for host and all 8 busses
- 4.5cm x 4cm footprint
- 4 x 3.4mm mounting holes (M3 clearance hole size)
- Optional pull-up resistors for SDA and SCL (toggled via jumpers)
The Raspberry Pi has internal pull-ups for I2C, so the J1 and J2 jumpers should not be populated when using a Raspberry Pi.
The I2C bus must be enabled to communicate with the board, this can be done using raspi-config, in the Interfacing Options -> I2C menu.
The ds2482 kernel module, included in the mainline kernels, is compatible with this board and can be used as follows:
modprobe ds2482
echo ds2482 0x18 > /sys/bus/i2c/devices/i2c-1/new_device
A systemd service file for Raspberry Pi is available in systemd/ds2482.service.
In the above example, 0x18 is the board's I2C address. This will remain valid as long as the AD0-2 pins are connected to ground. If you change this, you will also have to change the board I2C address.
The bus master devices, and any connected 1-Wire devices will appear under /sys/bus/w1/devices/.
This project is licensed under the CERN Open Hardware Licence v1.2.
See LICENSE.txt