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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