Instructables

Assembling the LCD117 Kit

Picture of Assembling the LCD117 Kit
This boards turns any (HD44780-compatible) LCD into a serial LCD. The kit is available from moderndevice.com and allows a LCD to be controlled by an arduino or clone with only 3 wires.
 
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Step 1: Resist!

Picture of Resist!
Mount a 10K resistor. The color codes are Brown Black Orange.

Step 2: Resist some more...

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Mount the 330 Ohm resistor. The colors are Orange Orange Brown.

Step 3: Only one direction

Picture of Only one direction
The diode can only function if placed correctly. Match the silver band on the diode with the band mark on the board.

Step 4: The capacitor

Picture of The capacitor
Mount the monolithic capacitor. Orientation does not matter.

Step 5: Switches

Picture of Switches
Mount the switches. These will snap into the board in the correct orientation. If they don't seem to fit, turn 90 degrees and try again.

Step 6: Trimpot

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Mount the variable resistor. This is where you will adjust the contrast of the display text.

Step 7: Power Regulator

Picture of Power Regulator
Mount the TIP 120. I find it easiest to bend the leads 90 degrees and then solder. Make sure the heat sink (metal) part is towards the board.

Step 8: Socket to me

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The IC socket should be mounted with the notch towards the variable resistor. Solder in two pins on opposite corners and then check the positioning. Finish up soldering when everything is where it should be.

Step 9: What Next?

Picture of What Next?
Now you need to decide which backlight resistor is needed for the display you have. If you have one of the displays from moderndevice.com this is pretty easy. If you have a different display, see here to determine the resistor value needed.

For the 2x16 Blue display, use a 28 Ohm resistor (Red Gray Black).

For the 4x20 Blue display, use a 33 Ohm resistor (Orange Orange Black)

Place this resistor in the spot marked Rbl.

Step 10: The headers

Picture of The headers
Solder in the headers which will match your display. The 2x16 and 4x20 displays I have both use the single line of headers at the top of the board. A double line of headers can be connected to the right side of the board if needed.

Solder in the pins at each end and then check for alignment before soldering the remaining pins.

Step 11: More headers

Picture of More headers
These are the headers that go to the arduino. Solder in the 90 degree male headers provided.
padberg875 years ago
I wish I had seen this just a few hours ago. I just finished soldering mine. Awesome job!
Soldier65755 years ago
Ha, you beat me to it! This was going to be my next instructable. great job! This kit rocks.