Technical Specifications

Acrylonitrile Butadiene Styrene, or ABS plastic, is an opaque thermoplastic. It is an amorphous polymer comprised of three monomers, acrylonitrile, butadiene and styrene. The acrylonitrile in ABS provides chemical and thermal stability, while the butadiene adds toughness and strength. The styrene gives the finished polymer a nice, glossy finish. ABS has a low melting point, which enables its easy use in the injection moulding process and 3D printing.

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ABS is very structurally sturdy, which is why it is used in things like camera housings, protective housings, and packaging. ABS is a good choice if you need an inexpensive, strong, stiff plastic that holds up well to external impacts.

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For our application we needed a sturdy and high torque motor. so we decided to go with the best available option pertaining to our budget and time constraints.

Specifications:

• Weight: 55 g
• Dimension: 40.7 x 19.7 x 42.9 mm approx.
• Stall torque: 8.5 kgf·cm (4.8 V ), 10 kgf·cm (6 V)
• Operating speed: 0.2 s/60º (4.8 V), 0.16 s/60º (6 V)
• Operating voltage: 4.8 V a 7.2 V
• Dead band width: 5 μs
• Stable and shock proof double ball bearing design
• Temperature range: 0 ºC – 55 ºC

We went with the entry level micro controller. We were using Arduino zero ARM based micro controller but the board couldn't cope with the power draw from the motor. So we decided to go with the standard 5V Arduino board and the processing power was enough for our use case.

The HC-05 Bluetooth Module was used in conjunction with Arduino board to remotely control the function of robotic hand. It offers a decent range and offers control to the user via android application.

We used a DC to DC buck to have a steady 5V supply to our circuit. We have a motor with high torque capacity which consumes a lot of power. Therefore we need significant power backup. We areusing multiple 3.7 V battries and to step down the voltage from 7V to 5V we used this module.