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Robotics for Control

A mini-sized robot for investigation in robotics and control systems

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The development of an inexpensive robotic platform is presented. Our aim is to provide a complete hardware tool as a low cost laboratory, to illustrate control systems. The capabilities of this platform allows both, researchers and students, to implement from basics techniques to complex ones (e.g. from PID to multi-agent systems). The hardware that has been designed and developed performs experiments for single or multiple robot control employing capabilities like: locomotion, communication, perception, and autonomous decision making. We illustrate three different control techniques using this platform.


Capabilities and Demos





Overview

The general design is presented using layers: The bottom layer supports the physical components, which compose the robot: Motors, IR sensors, expansion socket and modules, Rgb Led, Lipo Battery, Lipo charger, and global positioning system using an overhead camera. The peripheral layer is powered by the ATmega168A microcontroller, it allows to manage and drive all the physical components Above, the control layer performs the necessary actions to drive the robot in a safe way in their environment and complete tasks. The application layer describes the individual and collective actions that emerges when the robot, or the group of robots are operating. Finally the top layer, allows user trought the communication layer, debug, run, start/stop, and programming the robots.

Hardware Description


The complete hardware, is described in the previous picture. It is compound by: robots, computer, web-cam and controller board (the green one attached to computer). In the computer the user can write codes to program the robots (using AVR-Studio), also it runs the "Central controller" software that allows both send commands to robots, and process the web-cam information to global positioning system. The "Central controller" software is compatible with any web-cam with a minimum resolution (340x480 and 30 fps). The computer application communicates via USB with a Central Controller board designed to send user commands to robots wirelessly. The "Central controller board", has an AT90USB162 microcontroller that receives USB data from computer and send to the robots using the module NRF24L01, it also allows wire programming via (AVR-ISP).



Robot Main Board


The robot system is described in the block diagram above. The main parts are:

  • Embedded Computing: The embedded computing is powered by an Atmega168A microcontroller, which has an 8 bits architecture,running at 8MHz with 16K of memory, and a set of peripherals to manage different components. The programming language using is C and we provide the necessary libraries to drive the basic functions of the robot.
  • Locomotion subsystem: It is based only on the contact between the rotor of two tiny 3V electric motor and the surface. The manage of the motors speed and direction is done by the microcontroller, using PWM and digital pins, using the TB6552 driver .
  • Communication: Here, we use an ultra low cost transceiver RF (at 2.4GHz) module NRF24L01, which gives the robot the possibility to interchange data with the operator and other robots.
  • Power and Charging Management: The electronics are powered by a 3.7V, 200mAh LiPo battery. A voltage regulator is used to maintain a constant voltage of 3.3V and enable operation above 5 hours of constant working. Also an external LiPo charger has been built that uses an MCP73833 to manage battery reload.
  • Assembly and Costs: Three custom 3D print parts for easy setting-up and calibration of the motors and IR sensors are designed. These two pieces do not need to use glue or screws. An exploded view of mechanical assembly is shown. The 3D pieces models are available Here.
  • The Electronic design is available Here.

Lipo Charger



The Lipo charger board is USB (5V) compatible, it allows to charge a single cell Lipo battery, using the IC MCP73833. It recommendable to use a GP connector between battery and board (take care about polarity !!). The design and fabrication files are available Here



Central Controller Board


The Central controller board is also USB (5V) compatible. It has two functions:

  • First one: It can be used as a programmer emulating the AVRISPmkII programmer. Refer to the software section to it usage. When you have configured the Central controlled board as a AVIPSmkII programmer you just have to interconnect the ISP pins of this board and the ISP robot socket and avr studio to code and run your code.
  • Second one: It can be used as Wireless commander to the robots, for this you just have to plug-in the board and install the...
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  • 1 × ATMEGA168A Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
  • 2 × Custom 3d printed parts 3D Printed parts
  • 1 × NRF24L01 RF Communication
  • 1 × Lipo Battery Power
  • 1 × AT90USB162 Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
  • 1 × TB6552 Power Management ICs / Motion, Motor and Servo ControlH Dr
  • 1 × CLV1AFK RGB Led
  • 5 × TEFT4300 Opto and Fiber Optic Semiconductors and ICs / Photo Transistors
  • 1 × MCP78833 Lipo Charger
  • 2 × Tiny DC motors Motion

  • ​Previous Prototypes

    AndresRengifo05/07/2016 at 17:23 0 comments

    As you see, this prototype had tiny wheels that moved, by friction, with a micro vibration motor. The wheels also had magnets to perform dead reckoning using a hall sensor. However the slipping of the wheels result in inaccuracies in the dead reckoning system. Another problem with the mechanic system was that the power needed to overcome the wheel friction was to big and this prevented the speed control. Finally, minor differences between wheels and mechanical mounting produced a significant changes in the robot steering and make impossible an acceptable linear trayectory.

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raulMrello wrote 05/06/2016 at 06:47 point

Hi Andres, coooool!!!!

I'm impressed with the similarities of a project I'm just working on. You can see it here: http://letsmakerobots.com/node/47585

If you like, we can exchange informartion/ideas/comments as I'm doing more or less the same as you.

Congrats!!!!

  Are you sure? yes | no

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