1-Wire Network Power Injector
My 1-Wire Network is also used with some devices that require more power than the network can supply. To achieve this I've standardised on Cat5 cable and RJ45 connectors throughout. This means that I can use the spare wires to supply a 12Vdc supply and a 5Vdc supply.
The first node on my 1-Wire network is one with a 12V dc power feed and it includes a 5V regulator to deliver the 5V dc supply. The 12V supply is limited to about 2A and the 5V supply is limted to 1A for all of the devices on the network. An example of a device requiring 12V power is my 1-Wire twilight sensor.
If a device requires an accurate 5V reference supply further down the network it can include a reference voltage regulator, fed by the 12V feed. There will be some voltage drop along the network. Note that the 12V feed is floating compared to the PC and the 1-Wire interface. It does not like to be earthed in any way.
| This is the circuit board, which is based upon my 1-Wire PCB. It also incorporates a DS1920 temperature sensor. It's not the tidiest example as this was built using the intial prototype board. |