Development of Jump Markovian Dynamic Models of Low Cost Digital Duty-Cycle Modulation Drivers For Target System-on-Chip Devices

In this paper, a novel building algorithmic scheme of DDCM (duty-cycle modulation) drivers is presented. It is modelled in the analog domain as a continuous time jump Markovian dynamic model, with a deterministic two-state Markov chain. An equivalent discrete jump dynamic model is computed using pole-zero matching transform. Then, the resulting digital iterative algorithm, consists of simple digital operators and structures. The proposed DDCM algorithm is simulated under Matlab framework, and implemented using Arduino IDE-C++ with uploading into an ESP32 system-on-chip (SoC) device. The monitoring device connected to the ESP32 via an USB communication cable is an Arduino/IDE virtual monitor. It is configured for 230400 bauds communication. A low cost ESP32-based DAC (digital-to-analog converter), is virtually implemented and well tested as a case study of the proposed new generation of DDCM drivers. Matlab digital simulation results and ESP32 processing and virtual monitoring results are presented and discussed, in order to show the realistic nature and the great challenge the proposed DDCM algorithmic scheme for SOC devices.

PUT-Hand—Hybrid Industrial and Biomimetic Gripper for Elastic Object Manipulation

In this article, the design of a five-fingered anthropomorphic gripper is presented specifically designed for the manipulation of elastic objects. The manipulator features a hybrid design, being equipped with three fully actuated fingers for precise manipulation, and two underactuated, tendon-driven digits for secure power grasping. For ease of reproducibility, the design uses as many off-the-shelf and 3D-printed components as possible. The on-board controller circuit and firmware are also presented. The design includes resistive position and angle sensors in each joint, resulting in full joint observability. The controller has a position-based controller integrated, along with USB communication protocol, enabling gripper state reporting and direct motor control from a PC. A high-level driver operating as a Robot Operating System node is also provided. All drives and circuitry of the PUT-Hand are integrated within the hand itself. The sensory system of the hand includes tri-axial optical force sensors placed on fully actuated fingers’ fingertips for reaction force measurement. A set of experiments is provided to present the motion and perception capabilities of the gripper. All design files and source codes are available online under CC BY-NC 4.0 and MIT licenses.

DESIGN OF THE DATA TRANSMISSION BETWEEN THE EXERSICE SMART MINE WITH GROUND STATION USING LORA

Wireless data communication system through communication radio is one of the important points of informationdelivery process in TNI AL, It relates to the process of delivering information on the field that is difficult to obtaincommunication network via internet. The use of portable and strong communications against jammedinterference and other adjacent frequency interference becomes a fundamental necessity. The use of the UHFfrequency communication system is one of the efficient communication, With the high frequency of positivelyresulting in the physical size of the antenna is increasingly smaller. The purpose of designing datacommunication system devices between exercise smart mine and the ground station using Lora. In planning thiscommunication system uses the Lora SX1278 module as a data transmitter (Tx) and receiver data device (Rx).On the transmitter side (Tx) Lora uses the Arduino Mega 2560 microcontroller as the core or brain system. Onthe side of the receiver (Rx) Lora uses Arduino Uno R3 as the process data unit received by the Lora receiver.The main function of Arduino Uno as an intermediary to be able to transfer data to a PC or laptop device as aground station monitoring through USB communication channels. From the design, testing, and discussion ofresearch results during the preparation and manufacture of this final task obtained the results as expected. Thatthe design of data communication systems using Lora can be obtained a maximum range of 200 meters withthe condition of building obstructed. The ability of the Lora SX1278 module to receive data and transmit datafrom the GPS, pressure sensors and acoustic sensors is well received by the ground station, based on the datatransmitted via the Lora SX1278 module transmitter.Keywords: Lora SX1278, Arduino Mega 2560, Arduino Uno R3

Tuning parameters of the isochronous endpoint of a USB peripheral device in a multimedia system

Data exchange in the multimedia system between the camera and the computer can be realized via the USB communication interface. Applying the USB port requires tuning the port parameters in such systems to ensure the quality of the services (multimedia) provided. The tuning of the communication system depends on such selection of port parameters to optimize the imposed criteria. The authors proposed a quality criterion based on the USB isochronous interval. The paper briefly presents the quality measure and the transmission model of the data package. Next, the problem of tuning the USB port was presented based on the selected parameters (MaxPacketSize and MaxBurst) of the endpoint of the peripheral device. To assess the impact of the selected parameter on the quality of services in the system, a statistical test for homoscedasticity of empirical distributions of isochronous intervals, was used. Besides the results of the conducted experiments for the selected parameters presented in the paper, the authors also tried to explain the obtained results in relation to the specification of the USB port.

Desenvolvimento de sistema de supervisão e controle de uma planta de produção de cachaça tradicional: inovação e multidisciplinaridade na abordagem de identificação e controle de processos

The work presents a control and supervision system especially designed for a pilot plant of the traditional cachaça production. This plant is designed to develop multidisciplinary research aimed at improving the distillate beverage in copper still by understanding the dynamics of the biochemical and physical phenomena. The real-time acquisition of the input and the output data of the fermentation and distillation processes is carried out by an embedded platform based on available microcontrollers. These data are made available via USB communication network to a friendly data acquisition interface that can be used to develop process models, to execute simulations and to design controllers. From the point of view of research and teaching, the use of the system during normal operation of the plant allows the use of modelling and identification techniques to study the slow and fast dynamics exhibited by the processes of fermentation and distillation as well as the nonlinearities typical of such processes. In addition to that, actual instrumentation and control problems inherent to these processes are investigated via the control and supervision system. Finally, identification tests and modelling techniques applied to a real plant are shown and discussed in a multidisciplinary approach.

Low-cost teslameter based on hall effect sensor MLX90242

A low-cost teslameter based on a Hall effect sensor MLX90242 is proposed in this paper. The proposed teslameter is built around a PIC18F4550 microcontroller and it can measure magnetic flux density in the range between -55 mT and 55 mT. Temperature stability of measurements originates from the MLX90242 sensor itself. In order for the proposed transducer to be accurate, it has undergone a calibration procedure using a highly accurate teslameter employed as reference instruments and high-quality variable-field electromagnet. The proposed teslameter can store measurements on a PC via built-in USB communication.