Robotic Hand

This is how to make a robotic hand using only cheap materials.

We made this project for a STEM Math and Tech project.

For the robotic hand you will need:

• Arduino Board
• Servo Motor (5 pcs)
• Foam (Styrofoam)
• Glove
• Wires
• Breadboard
• Battery and Battery Buckle
• Rubber Band
• Pointed Rod
• Fishline or Wire
• Glue Gun and Utility Knife
• Pliers
• Paper Clips
• Sandpaper
• Marker
• Ruler
• Computer

Materials Needed: Ruler, Marker

To trace the hand you will need to;

• Trace a hand for the finger lengths and widths, length and width of the palm
• From the lengths and widths of the fingers , draw them onto your piece of foam into accurately sized rectangles
• Divide the fingers into three parts like knuckles

Materials Needed: Sandpaper, Rubber bands, Pointed rod, Wire, Paper clips, Marker, Foam, Hot glue

To create the foam hand you will need to;

• Round the fingers we made with a piece of sandpaper
• Using rubber bands tie the fingers together, leave some space in between each finger
• Using a pointed rod, create holes throughout the finger
• Through these holes, feed a wire through to the top of the finger, create a knot at the top to keep the wire tight and stable
• Using the lengths and widths of your palm, trace it onto the remaining foam and cut that out
• On the palm, use paper clips to make loops for all 5 fingers
• Attach the fingers to the palm by getting the access wire at the bottom of the fingers and feeding it through the paper clip loops you made
• At the beginning of the forearm, make five more paper clip loops in line with each other
• Finally, pull more wire through the last five loops with enough to attach to the servos

Materials Needed: Servos, Foam, Marker, Hot glue

To connect the servos to the hand you will have to;

• Cut a piece of foam to mount the servos
• Trace 5 servos on to the foam
• Connect the servos onto the foam by using hot glue
• Finally, take the access wire you fed through the loops and attach it to the servos

Materials Needed: Arduino,Servos

• The servo connections we use in this project are;

Orange Input - Signal Input

Red Input - Power Input (VCC)

Brown Input - Ground Input(GND)

• All servo motors power and ground connect to the motor shield
• The signal inputs of all servo motors are connected to the Arduino Digital PWM 3-5-6-9-10
• Connect the arduino board to your computer or laptop

Materials Needed: Computer

To begin coding the servos;

• Add the servo library into your code
• Define the servos by naming them as each finger
• Add each servo that you just defined into the code with each pin they are connected to
• Make commands using each servo and changing the value between 0-180 degrees, 0 being closed finger and 180 being fully open
• add your commands to the loop
• run the code while connected to your Arduino