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Control architecture of the robotic platform 

Control architecture of the robotic platform 

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Conference Paper
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This article presents the full integration of compact educational mobile robotic platforms built around an Arduino controller board in the Robotic Operating System (ROS). To that end, a driver interface in ROS was created to drastically decrease the development time, providing hardware abstraction and intuitive operation mode, allowing researchers...

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Context 1
... though most platforms referred in section II- A provide open source software, they usually require a slow learning curve and the hardware has limited expandability. Arduino solutions have recently appeared in the market to work around such issues. For this reason, our platforms were built around an Arduino control board [6] (Fig. 2), which accesses the motor encoders and other information from the power motor driver, like temperature and battery state, being also able to send commands to the motors, read sonar information and exchange messages natively through Zigbee. Although this section briefly describes the platforms assembled in our research laboratory, the proposed driver could be applied to any other Arduino-based platform such as the eSwarBot [11], the Bot’n Roll OMNI 27 and several others ( cf. , [2]). The Arduino-based platforms under consideration, namely the TraxBot v1 and v2 and the Stingbot are depicted in Fig. 3. All these platforms’ processing units consist of Arduino Uno boards, which include a microcontroller ATmega 328p that controls the platforms motion through the use of the Bot’n Roll OMNI-3MD motor driver. 27 As for power source, two packs of 12 V 2300 mAh Ni-MH batteries ensure good energy autonomy to the robots (around 2–3 h with a netbook atop). For distance sensing, three Maxbotix Sonars MB1300 with a range of approximately 6 m were used. However, and as experimental results depict in Section 4, the sensing capabilities of the platforms can be easily upgraded with other sensors, e.g., laser range finders, RGB depth sensors (e.g., Kinect), temperature, dust and alcohol sensors, etc. Moreover, the platforms have the ability to also include a netbook on top of an acrylic support, which extends the processing power and provides more flexibility. In our case, the ASUS eeePC 1025C has been used due to its reduced price and size. The netbook provides Wireless Wi-Fi 802.11 b/g/n communication to the robot and is dedicated to run ROS onboard, providing the tools and means for enhanced control of the robot. Additionally, the platforms are also equipped with an Xbee Shield from Maxstream, consisting on a ZigBee communication module with an antenna attached on top of the Arduino Uno board as an expansion module. This Xbee Series 2 module is powered at 2 mW having a range between 40 m and 120 m, for indoor and outdoor operation, respectively. Having specified the hardware and the platform electronics, the modular control architecture of these robots is summarized in Fig. 4. As Fig. 4 depicts, the Arduino Uno board is used as the central component of the system. The sonars range finders connect to the Arduino board using its analog inputs. As for the connection to the Bot’n Roll OMNI-3MD motor driver, the pins A4 and A5 are used as I2C peripheral. The Bot’n Roll motor driver has the ability to control the motion of the platform by benefiting from a PID controller for both velocity (linear and angular) and position of the motors. The feedback is given by the motors integrated encoders. The other analog and digital ports available can be used to integrate more sensors. The USB port of the Arduino board connects to the netbook, receiving (RX) and transmiting (TX) TTL serial data, which is decoded using a USB-to- TTL serial chip. It is also possible to send and receive information wirelessly, by benefiting from a ZigBee shield, or other shields that can be mounted on top of the Arduino board, providing a wireless ...
Context 2
... though most platforms referred in section II- A provide open source software, they usually require a slow learning curve and the hardware has limited expandability. Arduino solutions have recently appeared in the market to work around such issues. For this reason, our platforms were built around an Arduino control board [6] (Fig. 2), which accesses the motor encoders and other information from the power motor driver, like temperature and battery state, being also able to send commands to the motors, read sonar information and exchange messages natively through Zigbee. Although this section briefly describes the platforms assembled in our research laboratory, the proposed driver could be applied to any other Arduino-based platform such as the eSwarBot [11], the Bot’n Roll OMNI 27 and several others ( cf. , [2]). The Arduino-based platforms under consideration, namely the TraxBot v1 and v2 and the Stingbot are depicted in Fig. 3. All these platforms’ processing units consist of Arduino Uno boards, which include a microcontroller ATmega 328p that controls the platforms motion through the use of the Bot’n Roll OMNI-3MD motor driver. 27 As for power source, two packs of 12 V 2300 mAh Ni-MH batteries ensure good energy autonomy to the robots (around 2–3 h with a netbook atop). For distance sensing, three Maxbotix Sonars MB1300 with a range of approximately 6 m were used. However, and as experimental results depict in Section 4, the sensing capabilities of the platforms can be easily upgraded with other sensors, e.g., laser range finders, RGB depth sensors (e.g., Kinect), temperature, dust and alcohol sensors, etc. Moreover, the platforms have the ability to also include a netbook on top of an acrylic support, which extends the processing power and provides more flexibility. In our case, the ASUS eeePC 1025C has been used due to its reduced price and size. The netbook provides Wireless Wi-Fi 802.11 b/g/n communication to the robot and is dedicated to run ROS onboard, providing the tools and means for enhanced control of the robot. Additionally, the platforms are also equipped with an Xbee Shield from Maxstream, consisting on a ZigBee communication module with an antenna attached on top of the Arduino Uno board as an expansion module. This Xbee Series 2 module is powered at 2 mW having a range between 40 m and 120 m, for indoor and outdoor operation, respectively. Having specified the hardware and the platform electronics, the modular control architecture of these robots is summarized in Fig. 4. As Fig. 4 depicts, the Arduino Uno board is used as the central component of the system. The sonars range finders connect to the Arduino board using its analog inputs. As for the connection to the Bot’n Roll OMNI-3MD motor driver, the pins A4 and A5 are used as I2C peripheral. The Bot’n Roll motor driver has the ability to control the motion of the platform by benefiting from a PID controller for both velocity (linear and angular) and position of the motors. The feedback is given by the motors integrated encoders. The other analog and digital ports available can be used to integrate more sensors. The USB port of the Arduino board connects to the netbook, receiving (RX) and transmiting (TX) TTL serial data, which is decoded using a USB-to- TTL serial chip. It is also possible to send and receive information wirelessly, by benefiting from a ZigBee shield, or other shields that can be mounted on top of the Arduino board, providing a wireless ...

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