Wireless Embedded Air Multi-Parameter Measuring System |
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| O. Postolache, P. Silva Girão, J.M. Dias Pereira |
- Abstract:
- The article presents an embedded solution for the measurement of air parameters such as flow direction, flow velocity, temperature and relative humidity. The air flow velocity and direction measurement is based on a solid state sensor expressed by a set of ultrasound transmitters-receivers disposed according to the main cardinal points. 40kHz ultrasound burst signals are emitted from one cardinal point transmitter and received from the opposite cardinal point receiver whose conditioning circuit delivers a TTL pulse. The widths of the pulses obtained by the receivers are used not only to calculate air flow velocity and direction but also the temperature. Signal multiplexing, the trigger pulse generation, pulse width measurement and data acquisition associated with an additional relative humidity sensing channel are performed by a microcontroller (PIC18F452). The digital values associated with the measuring channels are transmitted using an ER400TRS RF wireless module that permits a point to point connection between the RS232 ports of the microcontroller and a host PC where the advanced processing and data publishing is carried out.
- Download:
- IMEKO-TC19-2007-058.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC19
- Event name:
- TC19 Symposium 2007
- Title:
- 1st Symposium on Environmental Instrumentation and Measurements
- Place:
- Iasi, ROMANIA
- Time:
- 19 September 2007 - 21 September 2007