Colorado Space Grant Consortium

1. Gateway To Space ASEN / ASTR 2500 Class #06 Colorado Space Grant Consortium

3. Today: • - Special guest to the class • Soldering 101 • SUNDAY, SUNDAY, SUNDAY • AVR SMACKDOWN!!! • 3:00 PM – 9:00 PM • - Need helpers for set up 1:30 PM • - Need helpers for tear down 9-10 PM • - Not every will enjoy Sunday • - Next class 9/15/09, Guest Lecture • Julia Chu, Lockheed Martin • Systems Engineering

4. Soldering 101 Colorado Space Grant Consortium

5. Soldering:

7. Caution: - Soldering is dangerous if not respected - Be mindful of where you are and where the soldering iron is - Eyes and liquid solder - Everyone is expected to solder - If you get burned… - Stay together, don’t work ahead

8. PCB – printed circuit boards Soldering Solder Pads Top View Side View Circuit Board Resistor

9. Prep Step 4: Tinning the iron • Tin the tip of the soldering iron by melting an inch or so of solder on the tip. • The iron will now look shiny on the tip. • Then wipe any excess solder on the golden sponge. • Now place the iron back into the holder. Tinning your soldering iron in this manner will aid in future soldering.

10. Prep Step 4: Tinning the iron (close-up)

11. Soldering Iron

12. Move soldering iron until tip is touching wire & solder pad

13. Move solder to touch edge of tip. Solder

14. Hold until solder melts on tip by wire Solder

15. Move solder back to touch wire only Solder

16. Move solder in to form a small pocket Solder

17. Move soldering iron tip up. This will drag solder up with it. Solder

18. Look for shinny fillets

19. Soldering Tips • Make sure tip is hot • Clean & tin tip • Keep tip clean by using wet sponge and cloth • Heat until the parts are hot enough to melt solder • Hold until solder flashes around pad • Do not put too much solder on

20. TIPS: workmanship.nasa.gov • Use caution when clipping leads to avoid flinging metal across the room. • All soldering must achieve a good solder filet on the pad as shown for circuit reliability. • Also clip the leads in this fashion. • Bend resistors and diodes using your plastic tool as shown. Example of a good solder filet

21. Tinned Copper Traces Top View

22. Soldered Top View Solder bridge shorting two traces - bad, bad, bad But, can be fixed by reheating or using solder sucker

23. Board Safety: Caution: Many of the components used in this workshop are sensitive to electrostatic discharge (ESD). Please ensure that you are wearing your protective wrist strap at all times. There will be a warning slide when components are ESD and heat sensitive. Clipping leads can sometimes cause them to separate in a rapid manner that could cause injury. Please take caution when clipping leads. Wear your safety glasses at ALL TIMES!

24. Board Safety:

25. Reading a Resistor: The resistors in this workshop have already been organized by value. In the event that your resistors get mixed, please refer to the chart at the left to classify your resistors, or use your multimeter. If you are unsure, don’t hesitate to raise your hand and ask for assistance.

26. Pre-Bending: • Pre-Bending 101: • Pre-bending is a technique that allows components to be easily inserted into a PCB. • Pre-bending also allows components to lay more flush with the board. • Bending components to the correct bend radius takes practice, but mastering the technique will reap rewarding benefits!

27. Pre-Bending: • Pre-Bending 101: • Start with the bending and prodding tool in the position shown in the top picture. • Choose a location along the length of the tool that will yield the appropriate bend radius. • Use your thumb to bend the lead such that the component and lead are orthogonal. 90°

29. Hands-on: Soldering 14

30. Hands-on: Soldering - Get into your teams - Each person on the team will solder their own circuit - You and your team will have 50 minutes - Let me know when you are done 15

31. Prep Step 1: Tool Layout • Prepare tools for the construction process. • Put on your safety glasses.

32. Prep Step 2: Grounding • Put on a static strap to remain grounded. Also make sure the strap is tight across your wrist. • This will protect any parts from electro-static discharge (ESD) and its harmful effects.

33. Prep Step 3: Soldering Station • Turn on the soldering iron • Set the temperature control on the soldering iron to a temperature less than 700 °F and greater than 450 °F. • - As a general rule use a temperature in the range between 550 and 650 degrees Fahrenheit.

34. Prep Step 3: Soldering Station

35. Prep Step 4: Tinning the iron • Tin the tip of the soldering iron by melting an inch or so of solder on the tip. • The iron will now look shiny on the tip. • Then wipe any excess solder on the golden sponge. • Now place the iron back into the holder. Tinning your soldering iron in this manner will aid in future soldering.

36. Prep Step 4: Tinning the iron (close-up)

37. Hands-on: Soldering Step 1: Distribute solder kits among team You will have to share the soldering stations Help each other learn the techniques 16

38. Hands-on: Soldering Step 2: Layout kit (Socket not shown) 17

39. Voltmeter is very useful -

40. Voltmeter 101: - This is the set up typically used

41. Voltmeter 101: Use this setting to check resistor values -

42. Voltmeter 101: Use this setting to check DC voltage -

43. Voltmeter 101: Use this setting to check continuity -

44. Hands-on: Soldering Step 3: Look at board, find reference point Install Side 18

45. Hands-on: Soldering Step 3: Look at board, find reference point Solder Side 19

46. Hands-on: Soldering Step 4: Flip board over and solder 8 pin socket Step 5: Install 555 timer. Small circle placed over pin hole “1” 20

47. Hands-on: Soldering Step 6: Flip board over and bend chip leads out DO NOT SOLDER AT THIS TIME 21

48. Hands-on: Soldering Step 7: Install 120 kΩresistor (Brown, Red, Yellow) 22

49. Hands-on: Soldering Step 8: Install 33 kΩ resistor (Orange, Orange, Orange) 23

50. Hands-on: Soldering Step 9: Verify resistors 33 kΩ Orange, Orange, Orange 120 kΩ Brown, Red, Yellow 24