Building the Energy Meter is quite straightforward but make sure
that you refer to our warning panel. This is not a project for the
As shown in the photos, all the parts are mounted on two PC
boards: (1) a main PC board coded 04107041 (138 x 116mm); and (2) a display PC
board coded 04107042 (132 x 71mm) for the LCD module and switches.
Fig.8: follow this layout to install the parts on the display PC board. The Altronics LCD module goes in the red position, the DSE module in the blue position and the Jaycar module in the green position.
Note that the display board was designed to accept three
different LCD modules – from Altronics, Dick Smith Electronics and Jaycar. The
straight-line 14-pin connection caters for the Altronics and DSE LCD modules,
while the dual 7-way connection is for the Jaycar module.
Altronics, Dick Smith Electronics and Jaycar will all have kits
for this project, so obtaining a kit will be easy. Note, however, that Dick
Smith Electronics will be supplying a different case to the one used for our
prototype. They’ve also altered the PC board layouts slightly, to get everything
to fit inside their case. Their kit department built a fully-working prototype
to confirm the design (see photo) and full instructions will be supplied with
Begin by checking the PC boards for the correct hole sizes. The
LCD module and transformer require 3mm mounting holes, while the switches
require 6.5mm holes. In addition, 2mm holes are required for the mains wire
Check also that there are no breaks in the copper tracks or
shorts between any of the tracks or pads. Note, however, that one of the tracks
on the main board has no connection at one end (ie, near the 10Ω resistor, to the right of the
transformer). This is correct – this track simply functions as an earth guard,
so don’t join it to anything.