ftw!
Home Blog Archives RSS
¶ IAP robots days 2,3
It's been a fairly exhausting week, but totally worth it in the end. All the students loved the class, had great fun building their vehicles, and (presumably) learned a fair amount in the process. Most people took longer than we anticipated and didn't get to the more advanced material like pressure sensors or motor controllers, but everybody completed an operational vehicle, tether, and control box (tether is the long cable connecting the vehicle to the control box). We hung out in the Alumni Pool for a few hours today, driving the vehicles around and playing some fun games. A few students brought their children and siblings, who were also thoroughly entertained.






I also managed to get a video of one of the vehicles doing some tricks (QuickTime, sorry!).


The total cost came out to be aroud $30 per vehicle, including tether and control box. If you're interested in building one, or putting one together for your kid or younger sibling/cousin/friend, it's a huge amount of fun and the basic vehicle doesn't require that much skill to assemble. I don't have the energy to post full instructions, (read that book!), but here is a complete list of parts we used.

Vehicle
qty name where to get price
4 Plastic propellor www.towerhobbies.com - LXE472 Dumas Plastic Prop 1/8" $1.15 x 4 = $4.60
4 12V DC Motor www.goldmine-elec.com - G9331 Type 2 DC Robot Motor $1.25 x 4 = $5.00
1 Male DB9 connector www.digikey.com 209M-ND CONN DB9 MALE SOLDER CUP TIN (or RadioShack part# 276-1537) $0.63
1 10' length Schedule 40 1/2" ID PVC Home Depot $1.62
2 - 10 Schedule 40 1/2" PVC 90-deg elbow joint Home Depot $0.25 x 10 = $2.50
2 - 8 Schedule 40 1/2" PVC 45-deg elbow joint Home Depot $0.35 x 10 = $3.50
2 - 8 Schedule 40 1/2" PVC T joint Home Depot $0.30 x 10 = $3.00
8 8x32 machine screws, 2" long Home Depot $0.0622 x 8 = $0.50
8 8x32 machine screw nuts Home Depot $0.025 x 8 = $0.20
4 pipe clamp thing (I don't know what it's called.. it's a metal bracket in the PVC aisle that is just the right size to clamp around the DC motor) Home Depot $0.159 x 4 = $0.64
4 something to couple the propellor to the motor shaft, ideally a short cylinder with 1/8" outer diameter, and 1/16" inner diameter. Otherwise, just wedge something in between and hot glue it.


Tether
qty name where to get price
1 Female DB9 connector www.digikey.com - 209F-ND CONN DB9 FEMALE SOLDER CUP TIN (or RadioShack part #276-1538) $0.67
1 Male DB9 connector www.digikey.com 209M-ND CONN DB9 MALE SOLDER CUP TIN (or RadioShack part #276-1537) $0.63
~10 meters CAT5 Ethernet cable your office closet?
2 D-sub backshell 9 position www.digikey.com A23475-ND (might not be correct part #), (or Radio Shack part# 276-1513) $1.95 x 2 = $3.90

Control Box
qty name where to get price
4 DPDT on-off-on rocker switch digikey, forgot which part#, or RadioShack $1.20 x 4 = $4.80
1 lighted rocker switch www.goldmine-elec.com - G8184 C&K Lighted Rocker Switch $1.00
1 Female DB9 connector www.digikey.com - 209F-ND CONN DB9 FEMALE SOLDER CUP TIN (or RadioShack part #276-1538) $0.67
1 some kind of project box (tupperware or something)


Other parts
1 or 2 spools per 6 or 7 vehicles 22 AWG red hookup wire DigiKey or RadioShack
1 or 2 spools per 6 or 7 vehicles 22 AWG black hookup wire DigiKey or RadioShack
solder DigiKey or RadioShack
closed-cell styrofoam or something to adjust the buoyancy of the vehicle
zip ties, rubber bands, or bag ties to secure the styrofoam
hot glue, to make things stick.

Tools:
  • Screwdriver (phillips, or slotted) for the nuts & bolts
  • Solder Iron
  • PVC pipe cutter or hacksaw
  • DC power supply, or rechargable 12V battery (an old car battery is fine)
  • wire snips
  • wire strippers
  • pliers
  • Hot glue gun




No comments, be the first!




Comments disabled until the spammers go away. I hope you comment spammers all die horrible deaths and are forced to delete endless streams of comment spam in your days in purgatory.
• Powered by bBlog