Available online at www.sciencedirect.com
ScienceDirect
Procedia Technology 24 (2016) 1194 – 1202
International Conference on Emerging Trends in Engineering, Science and Technology (ICETEST
- 2015)
Microcontroller Based Orbital Motion Shaker
Arshi Mohini*
Meccano instruments, Pune,411042,Maharashtra, India
Abstract
A novel procedure of controlling various environmental conditions, shaking speed and duration for shaking of liquid/ semi solid required for microbiology/ chemical research laboratories with the use microcontroller is presented in this paper. The Microcontroller monitors and controls the environmental conditions i.e. humidity, temperature and also provides selectable speed, duration of orbital motion shaker. The system consists of orbital motion producing mechanism, the enclosure for controlled conditions, instruments to control environmental conditions, feedback instruments in order to establish control and microcontroller system which provides programming, interlock and protection for conditions required. This advance microprocessor control ensures reproducible results and operator convenience. System interlocks are also provided in order as a safety measures towards samples examined or cultured by not allowing deviation from the programmed conditions. Microcontroller also ensures self correction in incubation, refrigeration or humidity controls by taking continuous feedback from field instruments. The control system becomes significant as it provides reproducibility in enzyme reactions like aeration in liquid or faster cell growth rate.
© 2016 The Authors. Published by Elsevier Ltd.
Peer-review under responsibility of the organizing committee of ICETEST – 2015.
© 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Peer-review under responsibility of the organizing committee of ICETEST – 2015
Keywords: Embedded system; Humidity control; Pulse width modulator ; Microcontroller; Temperature control.
1. Introduction
The paper aims to elucidate design of a system with help of a microcontroller [1] to control environment inside a closed chambers. Due to incorporation of microcontroller a low cost, easy, accurate and fast control over various environmental conditions is possible.
*Arshi Mohini. Tel 919765719062
Email: arshimohini@gmail.com
2212-0173 © 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Peer-review under responsibility of the organizing committee of ICETEST – 2015 doi:10.1016/j.protcy.2016.05.079
Many parameters cans be controlled using the concept illustrated in this paper but in the system designed the parameters controlled are limited to:
- Temperature
- Humidity
- Speed of rotation
- Door Lock
- Light requirements
The system controls 3 parameters- Temperature [2], humidity and speed with the help of a Microcontroller, which makes this product less costly. Door switch interlock is also provided in the system to stop spinning of motor in order to prevent any hazard. For orbital shaking we are using Triple Eccentric Counter balance Drive, driven by an AC motor. Also the user may acquire current data and can plot graph of temperature and humidity versus time. This application of microcontroller will facilitate extensive research in scientific experiments in pharmaceutical and chemical fields due to its very low cost. The system described works in three modes i.e. manual mode, programming mode and maintenance mode which are discussed with more details in other section of the paper. The primary advantage of this system is that is has no size constraints. The system can be small and compact for laboratory practices or can be very large for industrial application as the drivers and sensors can be changed according to application but the programmed microcontroller can remain same.
Literature Survey
There are similar products in the market. But the existing products in market either allow only shaking of the chemicals in the flask by controlling speed of AC motor used for shaking [3] or provide orbital shaking with temperature control only [4], i.e. maximum two parameters are measured and controlled i.e. temperature and speed. Also the existing systems use PLCs [5] which makes them expensive and complicated as for processing of parameters signal conditioning at multiple stages is required. But with microcontroller signal conditioning at only one stage is required. Thus it can be seen that the system showed in this paper is cost effective due to the use of microcontroller and provides effective and accurate control for more than two parameters. This provides the potential users to perform chemical processes which involve control over humidity, temperature and speed of shaking at same time which is not provided by existing products in market. Also the different modes provided in our system are not readily available in today’s market. Most of the affordable existing systems provide only manual mode in contrast to the discussed system.
Application
The advancement of medical science and pharmaceuticals necessitates highly accurate and efficient laboratory instruments [6]. The system described in this paper is highly efficient yet simple in design. The combination of cost effectiveness and technological aspects of the system makes it a competitive solution in today’s market [7]
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