Quantity   Component name
1 × 3d printed parts. The case doesn't have to be 3d printed, but the electronic hand does.
1 × Arduino uno R3 £6 - £16 Original Arduino or a compatible one.
1 × 4 channel relay shield (5v) £7 a specific model is required. See build instructions for photo
1 × servo/sensor shield £5 a specific model is required. See build instructions for photo
1 × 5v - 7v power supply for the servo's (see update) £19 Optional. 5v power supply for the servos. Possible to use your wheelchair's battery
2 × Turnigy 380 max micro servo £15 or similar high torque micro servos
1 × usb A to usb B cable - to go between pc and brain box £1.50
1 × USB A to DC plug cable £1.50 the particular type of DC plug isn't important, as it will be removed
3 × 3.5mm sockets with attached cable (mono) £2 each. Buy mono extension cables and cut the ends off
2 × Servo extension cables £2 - £4 These come in a variety of lengths. 30cm is fine if you mount your brain box near the joystick.
8 × M3 bolts £1 countersunk.12mm. Eight of them
4 × M3 Nyloc nuts £1 four of them
20 × self tapping screws 16mm £1 no.6 (3.5mm) 16mm long, 20 of them
20 × Self tapping screws 13mm £1 no.6 (3.5mm) 13mm long, 20 of them
4 × M3 Flat washers £1.50 four of them
1 × Self adhesive velcro, hook and loop £2.70 20mm wide. 60cm of hook and the same of loop
1 × Double sided foam tape £2.50
1 × Super glue £2
1 × Total cost £70 - £99