dincer hepguler robotics page01 

ROBOTIC ARM

Always wanted to make a robotic arm which is remotely controlled by the help of a microprocessor. these gadgets are always pricey. in the end i found OWI 535 which is fairly good looking and inside my budget. i already had few Arduinos around and decided to make a robotic arm out of it. i began with making a motor controller using Adafruit motor shield. however it had only 4 motor controls. i needed a 5th controller for the gripper and added few electronics using a relay and a transistor to control the gripper motor.  the task was not easy. i had to use an Arduino to move the arm and another Arduino clone which is a FIO to control the Nunchuck which i used as a wireless joystick. FIO has an X-Bee socket and can send controls wirelessly to the other Arduino which is controlling the arm. there is another X-Bee connected to this Arduino and they are communicating wirelessly... later i will place this robotic arm on my robotic rover to fetch things...

 here you can see my OWI 535 Robotic arm and its components... an Arduino is moving the arm withs its internal power... controls are sent wirelessly by a Nunchuck connected to a FIO and x-bee powered by a cellphone battery... im using the Nunchuck joystick and its accelerometer to move the arm and its 2 buttons to control the gripper... robotic arm controller
robotic arm robotic arm controller FIO arm controller FIO & nunchuck
arm controller Arduino robotic arm intelligent robotic arm

      You can find a video of my robotic arm in action on YouTube  HERE

 

 

     

                                                                                                                                                                                 

Update  2013:  I made a wireless glove controller for my robotic arm... Now the arm is controlled by hand movements and the little thumb joystick of the nunchuck. I dismantled the nunchuck and mounted the electronics and the thumb joystick on a glove. the gripper is controlled via two buttons on one finger. ArduinoFio and X-Bee is mounted on a foam which is on the glove... 

 

ROBOTIC HAND

I always wanted to make a robotic hand... For years it was one of my desires to make a robotic hand which is easy to build as DIY, but functional enough to use in many projects... There are many DIY robotic hands built by many talented designers and makers but none of the designs fulfilled my expectations. The hand must be easy to build but functional at the same time. At least it must hold and grab things and do that in a way our own hand does. One of the best DIY robotic hand designs belong to my friend Gael Langevin, who is a very talented designer, the InMoov Hand... This hand is part of the very well designed open-source 3d printable robot project, the InMoov. However, even this hand has some drawbacks according to me. It can grab things but the tendon mechanism to move fingers is controlled with fishing strings which is good for demonstrational purposes but lacks a firm grab. As an 3D graphics designer and a DIYer, I had to design something more versatile. The hand must be driven with steel wire tendons which are more suitable to apply more torque and control. The precision of movement can be controlled with servos but I have been testing some more alternatives such as worm gear or rack&pinion type of driving. The problem is that the mechanism must also be placed inside the hand housing without making the design too big and the hand must look like a real hand...

During all these years while I was busy with many other projects, I designed and tested many alternative hand elements. To find a sturdy and versatile design, I made many prototypes in the meantime. The flexible electrical wire holder pipes seem to be a good material and steel flexible wires are a good source of tendons. I learned a lot while making my own UAV airplane about servo driven movable parts and small accessories which I used while building wing ailerons and servo joints proved to be good gadgets to construct mechanisms for controlling finger movements... This photo shows many absurd trials and alternative designs for finger assemblies, finger joints, fingertips which I tested over years... But still I think that many other good alternatives are there, such as making use of springs, worm gears and rack&pinion type of designs...

 

Fingers

Robotic Hand project will continue...

 

 

 

 

solar bug  Right is one of my solar bugs... i love BEAM robotics... this tiny solar robot uses the sun to move itself randomly with its 2 motors... the solar cell provides energy which is stored in the cap and transistors supplies this energy as bursts to the motors...

At left you see my little bristlebot... powered by a coin cell and a tiny pager motor, this bug moves around fast just like a real bug following contours of the surface...

   

bugbot Left is my workbench showing my solar plantbot. those solar cells will be the leaves powering the multicolor leds inside the crystall ball which is the flower... at the lower left corner you can also see my tiny bugbot which can wander around by itself using 2 motors and a 3v battery pack. the bugbot has 2 touch sensors in front which it uses to sense the obstacles and change direction...

Right is my predator robotic head which can sense a person with its PIR sensor and can sweep its head from side to side when there is a  human movement around. the red led on one of its eyes increases robotic appearance... I am planning to add 2 ears (sound sensors) and a camera in the future...

My robotic head... This is my other robotic head which is more complicated... It has a webcam as right eye and a PIR sensor as left eye. both eyes are controlled together with 2 servos. Neck mechanism consists of 3 servos which can make realistic movements. Robotic head is controlled with 2 Arduinos, one is responsible for computer vision software (OpenCV and MyRobotLab) and the other controls head&neck movements via servo controller (Pololu MicroMaestro). Head can detect human movement and can track faces. My robotic head...

 




please e-mail to me at  dhepguler@hotmail.com

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