Building a NearSys BalloonSat Easy Flight Computer for a Near-Space Payload AEM 1905: Spaceflight...

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Transcript of Building a NearSys BalloonSat Easy Flight Computer for a Near-Space Payload AEM 1905: Spaceflight...

  • Slide 1
  • Building a NearSys BalloonSat Easy Flight Computer for a Near-Space Payload AEM 1905: Spaceflight with Ballooning University of Minnesota
  • Slide 2
  • BalloonSat Easy kit and instructions
  • Slide 3
  • Parts in BalloonSat Easy kit
  • Slide 4
  • Printed Circuit Board (PCB)
  • Slide 5
  • Resistors, to be numbered R1 R8
  • Slide 6
  • Diode polarity indicated by the stripe
  • Slide 7
  • 9-volt battery snap for main power
  • Slide 8
  • AAA battery pack for servo power
  • Slide 9
  • Wires for switches, camera, etc.
  • Slide 10
  • Toggle switches for main power and servo
  • Slide 11
  • Heat-shrink tubing (AKA shrink-wrap)
  • Slide 12
  • IC (only one shown) and two IC sockets
  • Slide 13
  • Capacitor polarized; longer lead is positive
  • Slide 14
  • 5-volt voltage regulator
  • Slide 15
  • Main power indicator LED; flat edge is the negative lead
  • Slide 16
  • Reed relay to fire hot-wired camera (in any)
  • Slide 17
  • 3- and 6-pin headers, including the Programming Header, the Commit Header, and the (female) receptacle
  • Slide 18
  • Shorting plug (AKA pull-before-flight pin) which goes over Commit Header
  • Slide 19
  • Identify which resistors are which then solder in R1 through R8 in exact locations. R8 = 330 ohms (missing from instructions).
  • Slide 20
  • Solder in diode use strip for polarity
  • Slide 21
  • Use Helping Hands to hold Commit Header in place for soldering
  • Slide 22
  • Commit Header now soldered in place (sticks off edge of the PCB)
  • Slide 23
  • Solder in 9-volt battery snap using the strain relief holes in the PCB
  • Slide 24
  • Do the same with the servo battery pack
  • Slide 25
  • Cut long wire into 6 equal pieces then strip one end of each to inch length
  • Slide 26
  • Leave other end of two unstripped (for camera unimplemented) but strip the others inch and twist to avoid fraying
  • Slide 27
  • Solder in camera wires, using strain relief
  • Slide 28
  • Solder in 4 switch wires, using strain relief
  • Slide 29
  • Slide on shrink-wrap before proceeding
  • Slide 30
  • Hook one pair of switch wires through the center and one side post of each switch
  • Slide 31
  • Solder wires to pins, minimizing diameter
  • Slide 32
  • Slide shrink-wrap over solder joints once both wires have been soldered
  • Slide 33
  • Shrink with heat gun complete 2 switches
  • Slide 34
  • Insert IC sockets in PCB watch notches
  • Slide 35
  • Solder in the capacitor watch polarity
  • Slide 36
  • Insert voltage regulator watch polarity
  • Slide 37
  • Avoid solder bridges on closely-spaced pins of the voltage regulator
  • Slide 38
  • Insert power indicator LED; positive lead (non-flat edge) goes next to the letter A
  • Slide 39
  • Insert REED relay only goes in one way
  • Slide 40
  • Insert 3-pin male Programming Header and 3-pin male Servo Header (short ends through the PCB) without soldering yet. Insert the 6-pin female receptacle (it may be too tight for all the pieces to fit flush).
  • Slide 41
  • Shave or sand off receptacle if need be so it fits next to Servo Header. Once all fit flush to the PCB, solder pieces in place.
  • Slide 42
  • BalloonSat Easy Flight computer, without chips, ready for testing