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Build Instructions, Page 5 / 6



Step 11: Display

Place the display into the top row of holes in the board. Solder a single pin, and then use a similar technique as used with the sockets to align the display while still only soldering the one pin. Solder the rest of the pins. When trimming these leads, you might need to use a fair amount of force–these pins are thick!

Adjust contrast with a screwdriverSelf test display

Step 12: Self-test

Check your work by checking the resistance again. It should still be in the megaohm range. If it is, add the batteries. You should hear a beep, then see “Nerdle v2.02 Self Test” on the display, and hear a second beep.

Adjust contrast with a screwdriverSelf test display

If you hear both beeps but don’t see anything, adjust the contrast potentiometer using a little screwdriver. If you don’t hear a second beep, double check your LCD connections!

Solder all the leadsLocation of potentiometer

Before you continue with the next step, remember to remove the batteries.

Step 13: Touch sensor resistors, power supply capacitor, chip

Add the remaining 10M resistors, there are four in total. They are labeled R1, R2, R3, R4. Use the white circles as a guide to their placement on the board. Solder them, and cut their legs. Make sure the metal parts of the resistors aren’t touching each other. Put the small capacitor in the area marked C3 by the test points. Solder, then trim the legs.

Location of capacitorLocation of touch sensor resistors

Put the 8 pin DIP chip into the socket. Line up the notch on the chip with the notch on the socket and with the drawn notch on the board.