If you purchase the kit, there will be a 25-pin breakable header, see figure 6. Count 16 pins, and break the header at that position. The 16-pin header is place at the top of the pc board to mount the LDC module. When soldering the 16 pin header make sure it is standing up straight. Break the remaining 9 pin header into three pin headers, see figure 7. Mount and solder two of the three pin headers in the J1 to J3 jumper positions.
Solder a 5-1/2” wire to the 3.5 mm jack, see figure 8. To the positive (tip) terminal solder a red wire, to the ground solder a black wire. Once the wires are soldered to the plug, see figure 9, thread the wires through the body of the jack and screw the body down on the plug.
Solder the red wire from the 3.5 mm jack to the Digital In on the pc board and the ground wire to the ground next to the Digital In.
Mount and solder the 9V battery cap to the pc board. Solder the red wire from the 9-volt battery cap to the +V terminal on the pc board. Solder the black wire from the 9-Volt battery cap to the GND terminal next to the +V terminal.
Mount and solder the 16MHz crystal to the XTAL position. Next solder the two 22 pF capacitors on either side of the 16 MHz crystal.
Mount and solder the pre-programmed 16F84-20 MHz microcontroller to the pc board. Make sure to orientate the top notch on the IC to the cutout on the silkscreen drawing. At this point you board is ready for mounting the LCD display, it should appear as in figure 10.
Mount and solder the LCD module to the 16-pin header. Make sure the LCD is level on the pins before soldering. In addition make sure the metal tabs underneath the LCD module do not short out the terminals on the 7805 voltage regulator.
