Formaldehyde contamination has increased alarmingly and terrifyingly in Bangladesh in almost all kinds of foods, vegetables, poultry and dairy products that poses potential threat to public health. This paper presents a complete design, implementation and testing of formalin detection kit based on a microcontroller. Since formalin is self-vaporized so the presence and concentration of formalin is detected by sensing the presence of formaldehyde gas using a volatile organic compound (VOC) sensor. The output of VOC sensor is directed to the microcontroller unit (MCU) which converts the electrical signal to a readable digital value. The hardware module is interfaced with an android smartphone app using bluetooth module. A complete device with suitable display, alarm system and bluetooth connectivity with mobile phone is implemented and tested. The kit is tested and results are validated with sample solutions prepared in the laboratory containing formalin of different level of concentrations. Industrial grade pure formalin is also used to prepare sample solutions to test the kit. The kit displays level of formalin present in test samples. Results show that detected level of formalin is consistent with formalin concentration used in solution samples. It also displays, temperature and humidity of the sample. Moreover, it alerts users with a high pitched alarm when excessively high level of formalin is detected in samples which is regarded as either “unsafe” or “danger” for health. Furthermore, comparative assessment shows that the developed kit can detect & measure the presence & level of formalin present in samples under investigation both qualitatively and quantitatively which is a clear advantage of our device over existing ones.
Design, Implementation and Testing of a Microcontroller-based Formalin Detection Kit-1
Design, Implementation and Testing of a Microcontroller-based Formalin Detection Kit-2
The rampant use of dangerous levels of formalin in food items has incited anxiety and concern amongst the Bangladeshi citizens. Sporadic monitoring, amalgamated with the paucity of well-grounded and inexpensive testing devices has created a need for the citizens to address the issue themselves. Impelled by promising results from a survey, FoodAlytics, a portable, economical and non-contact formalin detection system has been developed using locally sourced COTS components. Integrated with our own android application and bundled with the Grove VOC HCHO gas sensor, a recent innovation, our system has been able to detect up to 50 ppm of formalin. Polynomial regression, linear regression and the Levenberg-Marquardt algorithm, three supervised machine learning algorithms have been incorporated in our system to accurately predict the correct concentration of formalin at all temperatures.By applying logistic regression and support vector machines, our system is also able to correctly classify between artificially added and naturally formed formalin.
Low cost Prosthetic Hand design
Aimed at improving the quality of life for amputees, this project investigates the design of a prosthetic hand to mimic its human counterpart. Throughout this project, it has been approached as an endeavour of manufacturing, assembling and testing a design of a cost effective prosthetic hand. This type of technology does exist although it is expensive and generally not available to the people in developing countries. The physical structure of the hand has been modelled such that it can be easily assembled. It has been simplified such that it has five degrees of freedom while retaining basic important motions of the human hand. Rapid growth and advancement of the 3D printed prosthetic arms are being attached to victims of war throughout the world. A prototype of LASER cut prosthetic arm is introduced in this project, which is electro-mechanical and significantly less complex than myoelectric prosthetic prototypes.
Harnessing Passive Kinetic Energy
Activities such as walking, jogging or cycling can be used as a resource to produce electrical energy. According to Faraday’s law, there must be a relative motion between a magnet and coils to induce a voltage. Such needed relative motion could be brought about using the movement in daily exercise. Based on the above ideas, a wearable was designed to allow energy to be stored as a result of leg and hand movements during any activity.
Wirelessly Connected Biometric Attendance System with Low Percentage Warning
Many different aspects of human physiology, chemistry or behavior can be used for biometric authentication. The particular system demonstrated in this poster has a fingerprint sensor module which takes the fingerprints of an individual and later uses those fingerprints to determine if the individual is present or absent on a given day. It also wirelessly connects to the servers and sends the data to it for further analysis. The database is smart enough to calculate the percentage of recorded attendance and can also notify the concerned authority if some individual has attendance lower than a minimum level. The fingerprint sensor used in this system costs less than 10USD and can store fingerprints in its own memory. The system is small, easily manageable and very much cost effective.
Pet Robot or Human Following robot
Online Services Notification
The University of Dhaka - Amateur Ground Station (DU-AGS)
With a growing number of small satellites being launched every year, the humongous amount of data received from these satellites have become critical in catastrophe management as well as discovering new horizons in
the big data and aerospace community. Unfortunately, the financial and infrastructural investments, as well as convoluted training exercises associated with traditional ground station architectures makes it impossible for enthusiastic students, professionals and engineers in underdeveloped countries to own or operate one, hence depriving them of a rudimentary academic research and educational tool. Thus, we are proposing a modular, portable, inexpensive, robust and customizable ground station architecture. Features of this ground station include:
- Portable, modular and customizable antenna architecture; the ground station rotator boom supports multiple antenna structures and frequency bands (currently equiped with 433 MHz RHCP Helical Antenna).
- Simple, inexpensive and robust mechanical design; uses locally sourced COTS and 3D printed parts.
- Open-source hardware and computer design.
- Connected to an open-source GS Network (SatNOGS)