January 2020 STEAM Camp Kits BOM

Final Spreadsheet

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Working Spreadsheet

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Tablet

• Screen - 5" 800x480 - $32 [1]
• 7" screen amazon - $45 - [2]
• 7" screen - 1024x600 - $75 - [3]
• 7" screen - $70 - with cables and 5v 2A power supply - [4]
• 7" screen - Aliexpress - $38 - [5]
• Pi - $55 - Pi 4 with 4 GB RAM [6]. Comparison of 3 to 4 - [7]
• Pi camera - $9 for v1 [8] or '$25 for v2 [9] and [[10]]'
• Stabilizer bearings - skateboard bearings
• HDMI cable - $4 - [11]
• Wireless camera module - $20 - [12]
• You can get cheapo camera modules - [13]
• Bluetooth and phone for $40? - [14]
• LED chip - $2 - [15]
• Lithium battery charger - [16]

Day 1 - Printer

• Printer - $278 - [17]
• Filament - hex key holder - people print them out for the next bunch
• Filament - razor holder
• Filament - small pliers with 8 mm shaft pivot.
• Filament - motor coupler
• 3D printed ground electrode clamp, butt end
• 3D printed power panel
• Plotter Attachment with set bolt (16 cents, 6 mm bolt)
• 3D Printed etching bath
• 3D printed small vial for etchant

Day 2 - CNC Mill and Plotter

• 555 motor - $5 Jameco - [18]
• motor coupler - $1.25 - [19]
• 1 mm milling drilling bit - [20] - $1.50
• Pen for plotter - [21] . Just use refills. $1. From [22].
• Fabric marker for custom t-shirts

Day 3 - Electronics

• Atmel 328 DIP28 - [23] - $2
• Other components - see DIY Arduino. Crystal - $0.3 - [24],
• $2.11 - USB to serial converter - [25]
• Wires and resistors or capacitors -
• Stripboard (NOT perfboard) - $1 - [26]
• Soldering iron - [27] - $4
• Copper clad boards
• Copper chloride etchant

Day 4 - Battery Pack + Welder

• [6] 18650 battery pack - 24v nominal - $4 ea - [28] - $3 ea [29]
• Rectifier - $1.51 - 15A - [30]
• Transistor - 2 at $2 each - $4 -
• Heatsink - 2 at $1.2 each - $4 - [31]
• Heat sink fan - $1.4 - [32]
• m5x10 set screws - 60 cents for 12 - [33]
• 6 ga wire - 60 cents per foot - [34] - need 6' per welder - or $4 -
• Rod holder - with 3D printed insulation and ground wire clamp, and 3D printed ground electrode clamp
• Rod holder structure = bolt + EMT + internal rod. 1/2" EMT - 35 cents/foot. [35]
• Rod holder - 1/4" bolt (from 3D printer) screwing into a 3D printed endcap for EMT - just requires a 6 mm nut and bolt. 18 cents, same parts as 3D printer bolts.
• 3/8" rebar push bar for holding rod. 25 cents/foot . [36]