Presentation on theme: "CricketSat Assembly 1. Top side of printed circuit board (PCB) Schematic 2."— Presentation transcript:
CricketSat Assembly 1
Top side of printed circuit board (PCB) Schematic 2
Solder all components for the top side of printed circuit board (PCB) D1-LED – note, short lead in square hole C5 C4 C3 C1 C2 J1 – notch in this direction J2 R3 R4 SW1 4
Making the thermistor lead. Use twisted red/white wire. Thermistor (R2) connected here. 5
Put clips BC1 and BC2 on the battery. Attached to back of board with rubber band. Note the + (plus) terminal toward switch. Solder on front of PCB. 6
Check all solder joints to make sure that all have complete coverage of the via. Make sure there are no bridges (overlapping) solder between connections. 7
Solder on the two antenna wires as shown. Color does not matter. Check length of wire and cut to ~ 7”. 9
Insert the U1 - LM555 into the socket Attach the battery as shown. Be sure to put insulating tape on the face down on the battery. The prevents the case of the battery from shorting out the bottom side of the PDB. Note, the dot on the LM555 should be aligned with the notch on the socket. 10
1. Tum the switch on in this position. 2. If the LED lights up, go to the next page..3 If the LED does not lights up, you got big troubles, but we will tell you how to fix it. See page 13 for trouble shooting your CricketSat. Of f O n 11
1. Turn multimeter to Hz%. 2. Connect black lead to pin 1 of J2, Connect red lead to pin 2 of Je. 3. You should read between 1,1000 and 1500 HZ. If you do, you are now ready to calibrate your CricketSat – another document. 4. IF you read zero Hz, then go to page 13 to trouble shoot your CricketSat. Of f O n 12
1. Turn off the switch. Remove he LM555 from the socket. 3. You must to re-inspect the bottom of you PCB to make sure you have good solder joints on everything and not bridges. If you find problems and fix them go back to page You will now use your multimeter to check to make sure the circuit has the proper continuity. See page 14. Trouble Shooting your CricketSat Of f O n 2. REMOVE the battery In all your trouble shooting, keep notes on all of the measurements you make.
1. Be sure your CricketSat is turned off. Remove the LM555 from the socket. 3. Turn the meter switch to the diode/buzzer position. Short the read an black leads together and press the diode/busser button until you hear the buzzer. 4. You will now use your multimeter to check to make sure the circuit has the proper continuity. See page 14. Trouble Shooting your CricketSat Checking continuity Of f O n 2. REMOVE the battery. 14
1. Put the multimeter lead in the socket pins 4 and 8. See pin labeling below, right. Buzzer should sound. 3. If you do not get continuity, then check the PCB to determine what is wrong. Trouble Shooting your CricketSat Checking continuity Of f O n 2. These pins are connected together on the PCB (see schematic circled) and thus shorted or have continuity between them Continue checking other pins: 2-6 Ground on PCB to other pins: To J2 pin 1 To J1 pin 1
1. Be sure your CricketSat is turned off. Remove the LM555 from the socket. 3. Turn the meter switch to the resistance - ohms position. Short the read an black leads together and press the range button until you read zero. 4. You will now use your multimeter to check to make sure the circuit has the proper continuity. See page 14. Trouble Shooting your CricketSat Checking Resistance Of f O n 2. Make sure the battery is removed. 16
1. Put the multimeter lead in the socket pins 7 and 8. You should get what? Look at the schematic – 2.7k ohms. Trouble Shooting your CricketSat Checking Resistance and Capacitance Of f O n 2. Next check between 7 and 6. You will be reading the thermistor ~ 10k ohms at room temperature Continue checking other pins: 3 to pin J2 pin 2 – 330 ohms You can not check resistance across a capacitor or a diode with the resistance setting on the multimeter. Use the capacitance setting on the meter to check capacitance. 4. If you find errors, maybe a bad component or wrong component.
1. Put the battery back in and turn the switch on. Trouble Shooting your CricketSat Checking Voltages Of f O n 2. Turn the meter to Vdc and check between pins 1 and 8 on the LM555 socket. You should get approx. minus 9v. Minus because the red lead is on the ground connection. If voltage is below 9v, change batteries Look at the schematic and determine other places where you should also get 9v. If no voltage, trouble shoot. What is cause? 4. If you find errors, maybe a bad components. wrong components or bad connections.
If you find problems and can correct them, go to page 11 and repeat check to see if you can get your CricketSat to oscillate.