N3ZI Digital Dial
Assembly instructions addendum
Regarding the PCB to LCD Module interconnection, and alternate methods.
The above photo shows the simplest recommended interconnection
The boards are stacked back to back as shown, and 10 wires are soldered
straight through as show above.
I used insulated wires so they don't short out when flexed, and you can
see a little bit of bend on the wires in this photo
You can also interconnect the PCB to the LCD with a cable.
careful not to reverse the connection left to right in the process.
The photo above shows one method that works. You can reverse this
by soldering the connector to the back of the LCD module, but then you
must also solder the connector to the opposite side of the PCB.
If you are using more than 1 inch or 2 of cable you will need to add a
10K resistor to ground on LCD pin7 (or micro pin5). This is
because this line goes tri-state at times, and is susceptible to noise
pickup. Later versions of the software (after 07-2008) use slower
LCD control signals and thus are more tolerant of longer cabling.
In this example I have soldered a 10 pin header to the back of the
and a ten pin connector to the LCD module
Show below is a photo of the two plugged together.
If you look closely you will see that my female connector is
actually two strips of 5 which I cut out of an IC socket.
NOTE: When you are experimenting
interconnects, you should know that the LCD module is only initialized
once during power up. So if there is a missed connection during
power up the LCD will not be set up properly and won't work at all even
if the connection is restored later. You should, of course make
any connection changes with power off, then 're-boot' after any
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