January 2020 STEAM Camp Kits BOM
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Shipping - add about $20 per kit for shipping
Tablet
- Screen - 5" 800x480 - $32 [1]
- 7" screen - 1024x600 - $75 - [2]
- 7" screen - $70 - with cables and 5v 2A power supply - [3]
- 7" screen - Aliexpress - $38 - [4]
- Pi - $55 - Pi 4 with 4 GB RAM [5]. Comparison of 3 to 4 - [6]
- Pi camera - $9 for v1 [7] or '$25 for v2 [8] and [[9]]'
- Stabilizer bearings - skateboard bearings
- HDMI cable - $4 - [10]
- Wireless camera module - $20 - [11]
- You can get cheapo camera modules - [12]
Day 1 - Printer
- Printer - $278 - [13]
- 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
Day 2 - CNC Mill
Day 3 - Electronics
- Atmel 328 DIP28 - [17] - $2
- Other components - see DIY Arduino. Crystal - $0.3 - [18],
- $2.11 - USB to serial converter - [19]
- Wires and resistors or capacitors -
- Stripboard (NOT perfboard) - $1 - [20]
- Soldering iron - [21] - $4
- Soldring iron from 40W heater element?
Day 4 - Battery Pack + Welder
- [6] 18650 battery pack - 24v nominal - $4 ea - [22] - $3 ea [23]
- Rectifier - $1.51 - 15A - [24]
- Transistor - 2 at $2 each - $4 -
- Heatsink - 2 at $2 each - $4 - [25]
- m5x10 set screws - 60 cents for 12 - [26]
- 4 ga wire - 60 cents per foot - [27] - 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. [28]
- 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 . [29]