Download HW_4_Timing_Circuit (PPTmin)

Timing Circuit
Homework #4 – Bag B
Colorado Space Grant Consortium
Hands-on: Timing Circuit, Power & Camera
- Your team will do the following:
- Build the timing circuit
2
Hands-on: Timing Circuit, Power & Camera
- Test with 12 V power (Connector, switch, & battery
pack will need to be built and are not provided as
shown)
3
Hands-on: Timing Circuit, Power & Camera
Parts needed for Timing Circuit Steps:
1
Timing Circuit kit (in bag and not a box)
4
Hands-on: Timing Circuit, Power & Camera
Step 1a: Layout timing circuit kits and set parts out
5
Hands-on: Timing Circuit, Power & Camera
Step 1b: Study the PC Board front and back
Hands-on: Timing Circuit, Power & Camera
Step 2: Put/slide connectors together
Hands-on: Timing Circuit, Power & Camera
Step 3: Solder connect to board as shown:
Hands-on: Timing Circuit, Power & Camera
Step 4: Solder relay to board as shown:
Hands-on: Timing Circuit, Power & Camera
Step 5: Solder resistors to board as shown:
R1=R2=R3=1
KΩ
Hands-on: Timing Circuit, Power & Camera
Step 6: Solder diodes as shown (watch polarity):
D2
D1
D3
Hands-on: Timing Circuit, Power & Camera
Step 7: Install trimpots as shown. Do not adjust at
this time.
RV2=50K=PULSE
RV1=1M=PAUSE
Hands-on: Timing Circuit, Power & Camera
Step 8: Install red LED
LED: Make sure short
lead is installed in hole
next to relay (flat side)
Hands-on: Timing Circuit, Power & Camera
Step 9: Install Capacitor C1
C1=100 nF
Hands-on: Timing Circuit, Power & Camera
Step 10: Install Capacitor C2 and C3. Watch polarity.
Positive lead is the long lead and goes in the positive hole
C3=100 µF
C2=100 µF
Hands-on: Timing Circuit, Power & Camera
Step 11: Solder socket. Be careful of solder bridges.
Hands-on: Timing Circuit, Power & Camera
Step 12: Install 555 Timer chip. Be careful of
orientation
Hands-on: Timing Circuit, Power & Camera
Step 13: Attach two wires to each side of the single A23 battery
case (one red and one black) Make sure the red is attached to the +
side. Install one A23 battery (12 V) into this battery holder
Step 14: Use voltmeter to verify you have 12 V (you do not need
the switch for this test you will need to complete this test as shown
before flight)
Hands-on: Timing Circuit, Power & Camera
Step 15: Insert
the black wire
from the battery
pack into GND
(Should be “-” of
battery).
Hands-on: Timing Circuit, Power & Camera
Step 15b: Insert the red wire from the battery into
the +12V terminal on the timing circuit (should be
“+” of battery and not as shown below)
You should here a
click and see red
LED light up.
If not disconnect
power immediately
Hands-on: Timing Circuit, Power & Camera
If you are using a switch, do step 16
Step 16: Flip switch ON (should here a click and see
red LED light up)
NOTE: If not, flip switch OFF and have timing
circuit inspected
Hands-on: Timing Circuit, Power & Camera
Step 17: Adjust the pause
to get an interval of
between 15 and 30
seconds. Make sure that
the pulse is long enough
that the camera will
actually take a picture
(somewhere around 1
second).
Hands-on: Timing Circuit, Power & Camera
This step does not need to
be done as part of this
assignment
Step 18: Tape the sides of
the battery case and tape
the batteries into place
Hands-on: Timing Circuit, Power & Camera
Step 19: Disconnect 12 V battery and package
everything to bring to class on Tuesday. Make sure the
leads of your 12 V Battery are taped off
Heaters
Homework #4 – Bag C
Colorado Space Grant Consortium
Hands-on: Heater Circuit
Step 20: Set out kit (switch will not be as shown.
You will have to add wires to switch. Connector is
not included)
Hands-on: Heater Circuit
Step 21: Layout Resistors on Perf Board
Front
Back
Hands-on: Heater Circuit
Step 22: Fold over the leads from two of the blocks
and solder them together
Hands-on: Heater Circuit
Step 23: Snip the leads that you just soldered together
Hands-on: Heater Circuit
Step 24: Fold over the opposite two leads and solder
so that all of the blocks are connected in parallel then
clip the ends of the leads
Hands-on: Heater Circuit
Step 24 continued:
4Ω
4Ω
4Ω
Hands-on: Heater Circuit
Step 25: Twist all the Red wires from the 9V connector
together and solder them to the single blue wire in your
kit. (Do not solder red wire from switch)
Hands-on: Heater Circuit
Step 26: Twist all the Black wires from the 9V
connector together and solder them to the black wire
from the switch.
Hands-on: Heater Circuit
Step 27: Solder the single Blue wire from 9V connector to
one end of the resistor string and the other Red wire from
switch to the other end of the resistor string
4Ω
4Ω
4Ω
Hands-on: Heater Circuit
Step 28: With switch ON, check positive (+) circuit
connections with voltmeter.
Hands-on: Heater Circuit
Step 29: With switch ON, check negative (-) circuit
connections with voltmeter.
Hands-on: Heater Circuit
Step 30: Put electrical tape on solder joints in Steps 25 and
26
Hands-on: Heater Circuit
Step 31: Attach 3 flight batteries and turn switch on.
Your heater will get extremely hot with in 1 to 2
minutes. If longer, please let me know.
Hands-on: Heater Circuit
Step 32: Turn switch off, disconnect the switch from the
heater, leave batteries connected