This work is a medical electronic product with Atmega16 as the core of control. It is mainly used in the current medical care, real-time measurement of normal physiological characteristics such as the patient's body temperature pulse. Once these characteristics deviate from the normal range, the nursing guard can issue an alarm, so that the patient can receive timely treatment and protect the patient. Life is healthy. It has the characteristics of small size, light weight, versatility and high degree of humanity.
Realize the real-time monitoring of the patient's physiological characteristics, timely reflect the patient's condition to the medical staff, solve the loss of life and property caused by the patient's rescue is not timely, and achieve more comprehensive and meticulous medical care for the patient.
2, innovative, practicalThe Medical Care Guardian uses the Atmega16 as the main control chip. It uses two power supply modes to monitor the body temperature pulse by real-time measurement of the temperature sensor and the pressure sensor. The normal range of body temperature and pulse can also be set according to the patient's specific conditions. Can be applied to the medical industry to solve the troubles for the majority of medical patients.
Working principle MCU module:This work uses Atmega16 as the main controller and is powered by 5V. The temperature sensor and the pressure sensor are connected to the microcontroller via an intermediate circuit. The temperature sensing circuit module performs body temperature-voltage conversion; similarly, the pressure sensor can perform pressure-voltage conversion for each pulse. Then the two sets of data are transmitted to the MCU main control module.
The voltage converted by body temperature is input into a set of I/O pins by voltage division processing, the body temperature code written in the program is called, and data processing is performed to determine whether the patient's body temperature is within the normal range.
The pulse is converted into high and low voltage. After A/D conversion, Atmega16 performs frequency measurement and data processing to determine whether the patient's pulse is normal.
If the above one is not within the normal range, the alarm pin is set to 0 and the alarm is activated.
The data setting function is input through the keyboard, and the function realization of the module needs to write a digital code in the program.
Power module:The power supply adopts multi-source power supply mode, one is charged by a traditional charger, and the other is charged by a solar panel. The power module has a flexible solar panel with a size of 7cm*20cm, the output voltage is 3V, and the current is 330mA, flexible battery panels can improve the product's adaptability to the environment, can change the shape greatly, and its weight is very light, can be attached to the patient's clothes, can charge the battery in real time, the use of solar panels can Effectively reduce the number of traditional charging, more energy-saving and environmentally friendly. The battery is regulated by the L298N voltage regulator module to supply power to each module.
Alarm module:The buzzer is used instead of the alarm, and the DC power supply is used. The circuit is simple. When the pin of the Atmega 16 alarm function goes low, the emergency alarm is sounded. It also has a user-friendly extension that allows you to write different codes in the Atmega16 to change the frequency of the buzzer and simulate the sound at various frequencies.
Sensing module:The temperature sensor DS18B20 is connected to the armpit by a soft wire to obtain the temperature of the armpit. After being converted into a voltage, it is amplified by an amplifier circuit, and then output to a group of I/O pins of the Atmega16 through a voltage dividing circuit.
The pressure sensor (piezoelectric ceramic piece) is connected to the neck by a soft wire, which converts the body's pulse signal into an electrical signal. Since the electrical signal is very weak, it is first amplified by an op amp, A/D converted, and then connected to an I/O pin of the Atmega16.
Data setting module:The range of the pulse, the maximum value of the pulse, is input through the keyboard. The Atmega16 reads the keyboard input by scanning the keyboard.
Display module:The main body is 1602LCD, 5V voltage supply.
The display content of the 1602LCD display is controlled by Atmega16, and the code written in the program is read to the I/O port of the MCU, and 1602 is displayed.
Divided into two working modes, one is the data setting mode, and the other is the measurement and control mode.
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