关键词: 生猪心率, 姿态, 生猪习性, CC2530, 智能耳标

Abstract: 【Objective】 At present, currently the government’s supervision of pigs still remains in the passive supervision of label type ear, but due to the leg of supervision, the malignant event that died pigs were discarded often occurs. In order to solve the difficult problems of the remote supervision of the state of survival of pigs for regulatory authorities and facilitate the breeding enterprises to monitor the pig heart rate so that the pigs with abnormal heart rate can be treated timely by using intervention measures. A set of remote monitoring system which can collect the data of pig heart rate and judge the pig’s state of life or death was designed in this paper. 【Method】 The system uses the wireless sensor network architecture which consists of smart tag, routing nodes, gateway, remote server, monitoring center for pig farms and monitoring center for regulators. The data from smart tag is transferred with Wireless ZigBee network via routing node, and the GPRS module in the gateway will transfer the data through the Internet to a remote server. Once an exception in data occurs, software system will alarm automatically. Taking the program of wearable heart rate monitoring for reference, the paper uses photoelectric heart rate measuring method which uses LED and optical sensors, and combines with filter circuit and amplifier circuit to design the heart rate sensor. In order to know the wavelength of LED and the inducted wavelengths of light sensors, the research collects blood samples at different weight of Du pig ears, and uses the Ron Bo Bill’s law to research the spectral absorbance rule of the HbO2 in the blood of pigs and the hemoglobin in order to design the sensor of heart rate and analyze the reason why the heart rate sensor is not accurate in the motion state. The research also combines with the pigs’ sleeping habits to use DMP (Digital Motion Processor) of the attitude sensor MPU6050 to get the stable posture data and identify the inaccurate data. Finally, the research uses CC2530 carried with ZigBee Protocol to achieve the data reading from the heart rate sensor and MPU6050 through the ADC converters and I/O simulation IIC communication protocol. Meantime, the research transfers the data by the ZigBee network and turns on the mode PM2 to reduce power consumption. All these make the pig ear tag integrated the monitoring of the heart rate and attitude.【Result】Taking into account of the factors such as the cost of electronic components, the general rate and impact on pig lives, from the spectral absorbance law of HbO₂ and Hb, the result shows that the 560 nm light used to measure the effect of the heart rate of the pig is effective. Compared to the traditional manual measurement, the measuring error of the pig heart rate sensor with the wavelength is just 0.9%. Because the lying sleeping time of the pigs accounts for more than 75% and they usually take basic activities before and after eating, the heart rate sensor can test the pigs for a long time especially using MPU6050 to monitor the movement of live pigs. Consequently, the system developed in this paper can realize the monitoring of heart rate under the static state and the attitude in the motion state and pigs died if there is no data in the static state. 【Conclusion】Because of its light weight, small volume, low power consumption and accurate measurement, the pig ear tag can realize the monitoring of pigs in the static state and the motion state, thus realized the monitoring of the pigs’ survival condition and the long-term monitoring of pig heart rate. This changed the passive monitoring mode of traditional RFID ear tags and is of great significance for the supervision of government and the living welfare of pigs.

Key words: pig heart rate, posture, pig habits, CC2530, intelligent ear tag