1. Video of Assembly¶

2. Parts List¶

1	3D Printed Case
1	Panel Meter Clock PCB V2.1
12	M3 Hex Nuts
4	M3 Flat Washers
4	M3 Split Lock Washers
1	500mA Resettable Fuse Radial Lead Polyswitch
2	6x6x10mm Tactile Pushbutton
1	Micro USB Female Socket 180 degree
1	CR1220 Horizontal Coin Button Battery
1	CR1220 3V Lithium Cell Battery
2	85C1 5V Analog Panel Voltage Meter
1	Dual Row 6 pin Male Header

3. Print the Case¶

3.1. 3D Print Case¶

3D Print the front and rear of the case. All parts print without support. I have used both 0.2mm and 0.3mm layer heights with 3 top, bottom and perimeter shells in PLA.

4. Replace Meter Scales¶

4.1. Print New Meter Scales¶

Print the new panel meter scales. The Hour and Minute meter scales were created using Inkscape. The source SVG file is provided in case you wish to make changes, as well as 300 and 600dpi PDF files that can be printed at 100% scale. Print the meter scales so that the squares around them have a width of 59.5mm and a height of 35.5mm.

4.2. Cut Scales Out¶

Use scissors or a hobby knife to cut out the new meter scales.

4.3. Remove Meter Cover¶

Remove both screws holding the cover and remove it.

4.4. Remove Screws Holding Scale¶

Remove both screws holding the existing meter scale.

4.5. Use Screw to Enlarge Holes¶

Use one of the meter screws to enlarge the mounting holes in the new meter scales.

4.6. Install New Meter Scale¶

Carefully slide the new meter scale under the needle.

4.7. Replace Screws Holding Scale¶

Replace both screws holding the new meter scale. If the new meter scale does not lay flat, use a small bit of glue stick on the back of the top corners.

4.8. Replace Cover¶

Replace the meter cover.

4.9. Replace Screws Holding Cover¶

Replace both screws holding the meter cover.

4.10. Minute Meter¶

Repeat the process to make the Minute meter.

5. Assemble Clock PC Board¶

5.1. J1 ICSP Connector¶

Place and solder the 6 pin ICSP connector in the area labeled J1. Use tape to temporarily hold it in place if needed.

5.2. USB Connector¶

Place and solder the micro USB connector to the back side of the PC board in the area labeled USB.

5.3. F1 500ma Polyfuse¶

Place and solder the 500ma Polyfuse in the area labeled F1 and Trim the excess leads flush with the PC board.

5.4. HOUR and MINUTE Tactile Pushbuttons¶

Place and solder the time adjust buttons on the back side of the PC board in the areas labeled HOUR and MINUTE.

5.5. B1 Battery Holder¶

Place and solder the batter holder in the area labeled B1.

5.6. Battery¶

Insert the Battery into the Holder.

6. Programming¶

6.1. Connect ICSP Programmer¶

Connect the ICSP Connector to a ICSP Programmer like a USBTiny or another Arduino as show on the Arduino Website <a https://www.arduino.cc/en/tutorial/arduinoISP

6.2. Burn Bootloader¶

Use the Arduino IDE to burn the Arduino Leonardo bootloader.

6.3. Disconnect Programmer¶

Once the bootloader is programmed, disconnect the PC board from the programmer.

6.4. Connect USB Cable¶

Connect a USB Cable from your computer to the micro USB Connector on the PC board.

6.5. Upload Clock Program¶

Use the Arduino IDE to upload the panel_meter_clock2_1 sketch.

The clock time will be set to the current time of the computer used to upload the sketch.

The NeoPixel on the PC board should light and start to change colors. If the NeoPixel does not light up, go back, and check your solder connections for shorts or other issues.

7. Final Assembly¶

7.1. Install Spacers¶

Place a M3 hex nut on both of the meter input screw terminals on the back of each meter. These are used as spacers to set the distance of the PC board to the rear cover of the case.

7.2. Install Hour Meter¶

Insert the hour meter into the hole on the left side of the front case.

7.3. Secure Hour Meter¶

Secure the meter in place with a flat washer, a split washer and a M3 hex nut on each of the meter’s mounting studs. Needle nose pliers or Tweezers may be useful here, since there is not much room.

7.4. Repeat with Minute Meter¶

Repeat the process with the minute meter.

7.5. Secure PC Board¶

Secure the PC board to the back of the meters with four M3 hex nuts. The micro USB connector and tactile buttons should be facing out to the rear of the case.