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Sensor wireless data acquisition system
Shanghai Zhaofu Electronic Technology Co., Ltd. is mainly engaged in the development, production and sales of micro-power data transmission and data collection (Data) products. Sensor wireless data acquisition system, environmental monitoring wireless monitoring system, reactive power compensation grid monitoring system, wireless data acquisition module (analog 4-20mA, 0-5V, digital input), etc.; applied to areas and personnel with difficult wiring and power supply Inaccessible areas (such as high temperature, severe cold, high humidity areas, polluted areas or environmentally damaged areas) and some temporary occasions.
Abstract: In the field of industrial control, it is often necessary to collect a large amount of field data and then transmit it to the host for processing. At present, RS485 or other networks are usually used for data transmission. These networks are all based on wired transmission, and they have to consider not only cost factors, but also interference factors in data transmission. The wireless transmission has certain advantages, the cost is relatively low, and the interference in the transmission is also less, which also improves the reliability of the transmission to a certain extent.
A wireless sensor data acquisition system based on ZF02-96 is designed.
Keywords: sensor; wireless data acquisition; wireless handheld device; ZF02-96;
1 Introduction
In the industrial control field, it is often necessary to collect a large amount of field data, such as voltage, current, temperature, humidity, air pressure, etc., and transmit the data collected by these data acquisition modules to the host for processing. The host will control the signal according to the processing result. Transfer to the field execution module for various operations. At present, data transmission is basically based on wired networks, such as RS485, CAN, etc. These wired networks generally have disadvantages such as relatively high cost and inconvenient maintenance. The wireless transmission has certain advantages, such as low cost, high reliability, and convenient maintenance. This article introduces a wireless data acquisition system based on ZF02-96. The maximum transmission speed of the system can reach 19.2 kb/s.
2 System principle
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The sensor data acquisition and transmission part is composed of a sensor> pressure sensor, a temperature sensor, a signal processing part, a microprocessor (usually a single-chip microcomputer) and a wireless transmission circuit. The pressure and temperature sensors obtain the pressure and temperature values โโof the surrounding environment. The signal processing part includes The previous channel, program-controlled amplifier and A/D converter, whose function is to extract and amplify the analog signal of the sensor under program control, and perform analog/digital conversion. The microprocessor is responsible for controlling the work of each part of the system and performing the digital signal Processing. Under the control of the microprocessor, the wireless transmitting circuit encodes and processes the collected information data by the encoder, and transmits it with the transmitting module.
The data receiving part is composed of a wireless receiving circuit, a microprocessor and a display part, and receives the data transmitted by the radio under the control of the microprocessor. After receiving a set of format data, the decoder in the receiving circuit decodes the format data to obtain the current pressure information of the environment, and then displays the pressure information on the LED receiving panel.
The wireless data acquisition system introduced in this article has a certain reference value for other wireless data transmission applications. It can be applied to remote meter reading, remote monitoring and other fields by appropriately changing the hardware configuration and properly modifying the program.
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