Pencam Controller V1.3
Assembly Instructions

Part Identification
Printed circuit board V1.3
Microchip PIC preprogrammed with the controller firmware PIC 16F819
18 pin DIP socket for CPU  
8 pin solid state relay NEC PS7141-2A
Small arming switch Alco TSS-11
Acceleration Switch 2037-1-000
Status LED  
470 Ohm LED current limiting resistor Yellow Violet Brown
2.2K Ohm current limiting resistors (3) Red Red Red
100K Ohm Serial port resistor Brown Black Yellow
5V voltage regulator 78L05
0.1 uF tantalum decoupling capacitor V1
4 Pin connector for shutter  
3 Pin connector for serial port  
Battery Clips (2)  
Power jumper Red
470 uF electrolytic capacitor 470uF

Assembly instructions for older (pre-version 1.3) Pencam Controller kits can be found here

Building and Testing the Camera Controller

To assemble the Pencam Controller you will need the following tools


Part I

In this part of the assembly you will first build the minimal circuit. This won't do much, just flash the LED, but it helps to diagnose certain building errors early when they can be easily fixed. Take your time and test fit each part to make sure you are inserting it in the correct holes.

Step 1 Step 1: Identify all of the parts using the parts list above for reference.
Step 2 Step 2: Identify the top side (front) of the circuit board. It should say "AYUCR Pencam Controller" Place the power jumper through its holes on the front of the board and solder in place from the back side. You may need to file the pins slightly to get them to fit through. the holes. Clean any solder residue using a toothbrush and alcohol.
Step 3 Step 3: Solder the battery clips to the front side of the circuit board, again, soldering from the back side of the board. The clips must face each other so the battery may be inserted. The battery clip joints must be strong. Use a healthy amount of solder completely filling the holes.
Step 4 Step 4: Solder the decoupling capacitor in place as shown. There is a small plus sign with a white band on it indicating its orientation. This pin is on top. Trim the leads and clean any solder residue.
Step 5 Step 5: Solder 470 Ohm (Yellow Voilet Brown) LED current limiting resistor in place as shown. This resistor is placed on the back side of the circuit board while soldering from the front. Clip the extra leads off as close as you can to the board and clean any solder residue.
Step 6 Step 6: Bend the leads of the LED as shown. The short lead must be on the left. There is also a flat side of the LED to identify this lead (circled). This lead goes in the square pad on the circuit board. If you do this backwards the LED will not light.
Step 7 Step 7: Solder the LED in place as shown. The LED should face left. Trim the excess leads and clean any solder residue.
Step 8 Step 8: Solder the voltage regulator in place as shown. The orientation is important. The flat side faces right as you look at the board from the front. Snip off the extra leads close to the circuit board. As always, remove any solder residue as you go.
Step 9 Step 9: Test fit the IC socket. It fits over the decoupling capacitor from step 4. It must sit flat on the board and not touch the solder joint from the resistor on the back of the board. When you are sure it sits cleanly solder it in place. The notch should face up as it serves and an indicator for inserting the CPU. Clean any solder residue.

Testing and Toubleshooting

Once you have gotten this far you should be able to test the circuit. Make sure there is no flux residue left on the board. It is a good idea to test the PIC socket using a multimeter before inserting the PIC. Place a fresh 12V battery in the battery holder with the positive side up. Wrap the battery in tape to prevent it from shorting on the metal battery clips. Power the cicuit on by placing the red power jumper on the power header. Using the minus side of the battery as your ground Pin 14 (start at the upper left pin which is pin 1 and count counter-clockwise to pin 14. It is the middle pin on the right side of the socket) should have +5V and pin 5 should read 0V. If not recheck all of your work before proceeding.

Step 10 Step 10: Turn the power off by pulling the red jumper. Insert the PIC processor in its socket with the notch on the chip oriented up. The notch on the socket and the chip should coincide (circled in photo). Power up the unit again. The Pencam Controller LED should blink slowly indicating the unit is powered up in standby mode.

If the LED does not light or the LED lights but stays lit remove power and debug the circuit

Part II

Time to finish the circuit. Remove the battery from the battery holder before continuing. Follow the remaining directions to complete the Camera Controller.

Step 11 Step 11: Solder the arming switch in place as shown. It should fit snugly to the board. Use healthy solder joints to hold it securely in place. Again, clean any solder residue.
Step 12 Step 12: Solder two 2.2K ohm (Red Red Red) current limiting resistors in place as shown. These are soldered to the back side of the board. Trim the leads and clean any solder residue.
Step 13 Step 13: Solder the two serial port resistors in place as shown. These are soldered to the back side of the board. The 100K ohm (Brown Black Yellow) resistor goes in the top set of holes and the 2.2K ohm (Red Red Red) resistor goes in the bottom set. Trim the leads and clean any solder residue.
Step 14 Step 14: Solder the serial port header in place as shown. Use healthy solder joints for strength. clean any solder residue.
Step 15 Step 15: Solder the camera interface header in place as shown. Use healthy solder joints for strength. clean any solder residue.
Step 16 Step 16: Solder the solid state relay in place as shown. The dot on the top of the package denotes pin one and coresponds to the square . Clean any solder residue.
Step 17 Step 17: Solder the 470uF capacitor in place as shown. The negative lead is identified by a white band along the side of the capacitor. The lead goes in the topmost hole. The capacitor should lay flat on the board. You can use a bit of hot melt glue to hold it in place. Trim the leads and clean any residue.
Step 18 Step 18: Solder the G-switch in place as shown. The flange must face down or the G-switch won't detect liftoff. Make sure the flange does not touch the lower solder pad. Trim the leads and clean any solder residue.
Step 19 Done!

You should now test the parts of the circuit you added in part II. Power up the Pencam Controllern by placing the red jumper on the power header pins. Make sure the arming switch is up (standby mode) The LED should blink slowly, about once every two seconds. Arm the controller by sliding the arming switch down. The LED should now blink faster. Disarm the controller. To test the serial port see the instructions for using the programming software.

Good work! Make sure you understand how the timer works and it is tested and trimmed prior to your first flight.

See the Articles section of the website to find instructions on assembling a cable to interface the Pencam Controller with a PC or Palm.