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Environmental conditions has a direct impact on the ultrasonic sensors, transducers and other metrological standards. It is also deviates instrument parameters during calibration experiments and their results. So, the accuracy and consistency of the experiments are greatly affected. Particularly in ultrasonic calibration, temperature and humidity play vital role because speed of sound is changed due to change in air density as a result of changes in temperature and humidity. Owing to these parameter an error in speed of sound occurs. To overcome this problem an indigenous environment monitoring module (EMM) is developed, which may be used to monitor the environment conditions in the ultrasonic or any other metrological laboratories. Before going to the actual hardware development, the simulation of the module was performed on the proteuse-8 software. A micro electro-mechanical sensor (MEMS) module (BMP180) is used. BMP180 is designed to communicate with a microcontroller via I2C protocol. The pressure and temperature data is compensated by the calibration data of the EEPROM of the BMP180. The module consists of piezo-resistive barometric pressure and temperature sensors, an analog to digital converter, a controller unit with EEPROM and a serial I2C interface. It delivers the uncompensated value of pressure and temperature. This MEMS sensor programme code was developed and successfully written in C language using Atmel studio- 6.0. The system developed uses Atmega-8 microcontroller. The requirement of temperature in the primary ultrasonic laboratory range is 23-27 °C with accuracy of ± 0.5 °C. The relative humidity requirement is 45 – 65 % with ± 10 % accuracy. Atmospheric pressure in the standards laboratory is also maintained at 980±10 mbar. In our environment monitoring module temperature and atmospheric pressure ranges are - 40°C to + 85°C and 300 mbar to 1100 mbar, respectively. So it covers complete range of ultrasonic as well as other laboratories temperature and atmospheric pressure requirements. This environment monitoring module is very economical as compared to other commercially available modules. In this paper the design details of the developed environment monitoring module are discussed. The functionality of the module to monitor the environmental condition of the laboratory is included.
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