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					 CricketSat LP
Assembly Manual




     Mike Fortney
      06/26/2006
                Index
• CricketSat LP (Low Power) Sensor
  Parts Map
• CricketSat LP Sensor Assembly
• Testing
• Troubleshooting
• Contact Info
                Parts Map
Print out the Parts Map on the following
 page.
Lay components on respective images to aid
 in identification during assembly.
                                            CricketSat LP Parts Map                                       100k Ohm (@ 25C)
                                                                                                     R1
                                                                                                                      Thermistor

                                                                                                            2.2M Ohm
                                     Antenna Wires
                                                            Notch
                                                                                                    R2 Red-Red-Green-Gold
                                                                             U3
                                                                                                            330k Ohm

                                                                                                    R3 Orange-Orange-Yellow-Gold
+   -
                                                                                                            18k Ohm

                                                                                                    R4 Brown-Gray-Orange-Gold
            SW1                      U2                     U1
                                                                              RF
           Switch                5V Regulator             Timer IC
                                                                          Transmitter                       33.2k Ohm

                                                                                                  R5 Orange-Orange-Red-Red-Brown




                                                                                                    R6 Channel Dependent
                                                                                                                33 Ohm
                  Battery Clip                   Printed Circuit Board
                                                                                                    R7 Orange-Orange-Black-Gold
                                                                           47uF               +
                                                                     C1                   -                     680 Ohm
                                                                           47uF               +     R8 Blue-Gray-Brown-Gold
                                                                     C3
                                   Notch                                                  -
        Speaker                                                            47uF               +
                                                                     C4
                                           U1 Socket                                      -
                                                                                                   D1 LED                        +
                                                                                                                             -
                                                                     C2           0.01uF                        White Band

                                                                                                                +     -
                                                                     C5           0.1uF              D2 Diode
                                           Speaker Jack
                                                                     C6           0.1uF                         +     -
                                     J1                                                              D3 Diode
                                                                     C7           0.1uF
CricketSat Assembly (1 of 16)




 Install resistors R2, R3, and R4. Solder and clip leads.
 Resistors are not polarized, orientation is not important.
 R2, 2.2M Ohm (red-red-green-gold)
 R3, 330k Ohm (orange-orange-yellow-gold)
 R4, 18k Ohm (brown-gray-orange-gold)
CricketSat Assembly (2 of 16)




 Install resistors R5, and R6. Solder and clip leads.
 Resistors are not polarized, orientation not important
 R5, 33.2k Ohm (orange-orange-red-red-brown)
 R6, Resistor value dependent on channel number. It will be the
remaining blue resistor in your kit.
 CricketSat Assembly (3 of 16)




 Install resistors R7, and R8. Solder and clip leads.
 Resistors are not polarized, orientation not important
 R7, 33 Ohm (orange-orange-black-gold)
 R8, 680 Ohm (blue-gray-brown-gold)
CricketSat Assembly (4 of 16)
                            White bands to the right.




 Insert diodes D2 and D3 as shown above.
 Diodes are polarized. Install with white bands orientated as shown.
 Solder and clip leads.
 D2 and D3: 1N4001 diodes.
CricketSat Assembly (5 of 16)




 Install capacitors C5, C6, and C7.
 These capacitors are not polarized. Orientation is not important.
 Solder and clip leads.
 C5, C6, and C7: 0.1 micro Farad capacitors (104 marking)
CricketSat Assembly (6 of 16)
                                 Notch




 Install switch and timer IC socket. Solder all pins. No clipping
required.
 Use masking tape to hold switch in place while soldering.
 Make sure that socket pins are in a straight row before inserting
into board. Insert socket with the notch pointing up.
 Socket will snap into place.
 Make sure that all 14 socket pins poke through board before
soldering.
CricketSat Assembly (7 of 16)




 Install D1, the red light emitting diode (LED).
 The LED is polarized. The longer lead is positive (+). Orientation
is marked on the circuit board.
 Insert LED flush to circuit board.
 Solder and clip the leads.
CricketSat Assembly (8 of 16)
                 White bands towards switch




                 White band

 Install capacitors C1, C3, and C4 as shown above.
 These electrolytic capacitors are polarized. The side with the white
band is negative. The positive capacitor lead is longer.
 Solder and clip the leads.
 C1, C3, and C4: 47 micro Farad capacitors
CricketSat Assembly (9 of 16)




 The 5-Volt regulator (U2) is
polarized. Orient with the flat
surface as shown above.
 Insert to this height.
Solder and clip the leads.
CricketSat Assembly (10 of 16)




     Longer leads for speaker connection

 Install J1 2-pin speaker header as shown, longer leads on topside
of circuit board.
 Use masking tape or rest on table to hold in place while soldering.
 Solder shorter leads. Do not clip.
CricketSat Assembly (11 of 16)




 Install U3 transmitter module as shown, with the metal can facing
the outside of the board.
 Use masking tape or rest on table to hold in place while soldering.
 Solder and clip leads.
 CricketSat Assembly (12 of 16)



                          Solder here       Solder here

 Route 2” of battery         Push the bare               Solder wires in
clip wires down through      ends back up                 place on the TOP
the inner strain relief      through the B+ and           side of the circuit
holes as shown.              B- holes.                    board. Clip the
 The red lead through        Pull the wire,             leads.
the hole closest to B+       removing most of              Pull on the wires
and the black lead           the slack, leaving           to remove any
closest to B-.               small loops.                 remaining loops.
 CricketSat Assembly (13 of 16)




 Insert bare end of        Route free ends of antenna     Bend the wires
antenna wires into         wires up through inner strain   to a 45 degree for
OUTER holes as shown.      relief holes.                   best performance.
 Let circuit board rest    Pull wire until no loop
on wires, propped in air   exists below board.
as shown.
                            Bend the remaining loop
 Solder and clip leads.   as needed to finish task.
CricketSat Assembly (14 of 16)
 Install capacitor C2 flush
to the circuit board as shown
to the right. Wiggle and push
as necessary.
 Orientation for this
capacitor is not important.
 Solder and clip leads.
 C2: 0.01 micro Farad
capacitor (103F marking).
CricketSat Assembly (15 of 16)

 Install the thermistor, R1
as shown.
 Solder and clip leads.
 R1: 10k Ohm thermistor
at 25degrees C.
CricketSat Assembly (16 of 16)




   Install the TS556 timer IC, U1 as shown.
   Pins are flared outward. May need to slightly bend inward
  before inserting into socket.
   Check alignment before pressing into place.
                         Testing
•   Slide power switch to “OFF” position.
•   Attach a 9-Volt battery
•   Slide power switch to “ON” position.
•   Wait up to 30 seconds for the LED to turn on briefly.
•   If the LED does not light, proceed to the next slide,
    “Troubleshooting”
•   Connect a speaker from the receiver kit to the speaker jack
    (J1)
•   You should hear a faint tone periodically. Remove the
    speaker to enable the LED and RF transmitter to operate.
•   Test the unit with a CricketSat receiver. You should be
    able to monitor CricketSat sensors several hundred feet
    away.
•   The range for balloon flights may exceed one mile.
              Troubleshooting
• No sound or lights, no smoke
   – Insure that slide switch is working properly
   – Check if battery leads are correctly attached to board,
     red +, black -
   – Check if D1 and D2 diodes are properly installed, white
     band is “-”
   – Check if U1, U2 and U3 are installed properly
   – Try another battery
• Sound, but no lights
   – LED may be installed backwards
• Lights, but no receiver sound
   – Turn volume control on receiver to a median setting.
     Should hear hissing sound.
              Contact Info
• Michael Fortney
  – mfortney@cems.uvm.edu
• UVM CricketSat Website
  – http://www.uvm.edu/~cricksat

				
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