I decided to sit down and learn how to use the Cadsoft Eagle PCB package a couple of days ago so that I wouldn't be stuck with dog-eared bits of paper with all my designs on!!
I'm providing links to the screenshot captures rather than in-lining them as they are a bit too wide (even though they are small) and resizing them makes them useless.
The addition of the 1-wire and SparkFun (http://www.sparkfun.com/) Eagle libraries has made it simple to get to the PCB stage.
The design is in three sections:
* The driver board which sits in the Linksys router connected to the UART connector and providing a 1-wire Mater socket
* The battery monitor circuit
* sharing the PCB with the monitor is the controller circuit - this is specific to my inverter in that it emulates a remote start push button and checks that that the indicator LED lights up to say the inverter has started up.
The driver circuit here has the 5 pin connector on the left that plugs into the Router UART and the RJ11 connector on the right is the 1-wire interface. The jumpers allow for complete galvanic isolation between the two if required, in which case +5 volts must be supplied from the 1-wire side. The addition of +5 and +12 volts to the RJ11 is for the convenience of a single supply for the whole controller.
The layout for the driver is here . It has not yet been fully tested (I forgot to get a couple of the components!!).
The controller circuit here shows the monitor circuit on the top and left and the inverter controller on the right and to the bottom. The layout here I've done such that the top half can be cut off to leave just the monitor which only has 3 tracks going to the controller.
The Eagle CAD files can be found in a zip file here
