Design of hospital call intercom system based on MSP430 and DTMF technology

With the rapid development of science and technology, especially the continuous updating of electronic information technology, the medical and health undertakings have gradually deepened reforms, and the realization of modern medical care has become the trend of future development of hospitals. Hospital call intercom system is an important equipment to improve the level of hospital care. First, its basic function is to make the communication between the nursing target and the medical staff through a simple way. The 16-bit MSP430 MCU has a high degree of integration and abundant on-chip resources. The main outstanding feature is low power consumption, which can achieve long-term stable operation. After being applied to the system, the performance is well optimized and the medical staff can be improved. The efficiency of work and the reduction of their labor intensity, the patient can also get timely care and medical treatment, can significantly improve the hospital's service level and medical quality.

1 Introduction to DTMF call intercom system

1.1 Introduction to DTMF Technology

DTMF (Dual Tone MulTI Frequency), which is a dual tone multi-frequency, is composed of a high frequency signal and a low frequency signal superimposed to represent a number or a character. A dual tone multi-frequency signal is a combination of two specific single tones to represent a number or function. There are four kinds of high and low frequency signals, which respectively form a high frequency group and a low frequency group. The combination of 8 and 1 is used to form the DTMF signal, so that there are 16 configurations, which can respectively represent 0-9, A-D, * on the dial pad. , #, etc. 16 characters, according to the signal frequency and characters corresponding to the table (as shown in Table 1). Because of its good anti-noise characteristics, it is widely used in dial-up transmission of communication systems.

1.2 How the call intercom system works

The host and extension of the system are controlled by the single-chip microcomputer. Since there is only one host in the whole call system, it is the core module of the system. It can be connected to the extension through the external bus to realize the function of call intercom. The host can receive the call of the extension at any time, and the digital display and the patient information list display table can display the corresponding information synchronously and accurately. There are first, second and third level of care levels. When there are multiple call signals, Cycle through the order of care and the order of the call.

2 overall design of the system

The system can be divided into three parts in space, namely the medical staff duty room, ward and corridor (as shown in Figure 1). The host computer, telephone and patient information list display table are installed in the medical staff duty room, the extension is installed in each bed of each ward, and the digital display screen is installed in the corridor. When the host is in standby, the digital display on the corridor displays information such as date and time. When a patient calls the host using the extension, the host in the duty room of the medical staff will ring the signal and the patient information list and the digital on the corridor. The display will show the information of the corresponding patient. After the call is connected, the medical staff will know the patient's condition in order to prepare the corresponding medical measures.

Electronic Lock Motor product introduction:

Electronic Lock Motor, also known as Intelligent lock motor, Belong to small reducer series, the main structure composed of drive motor (motor) with a reduction gear box, composed of a shaft connection, form integrated motor reducer; Drive motor is purchasing product, reduction gear box is customized according to the project product demand, the maximum power under 10 w, maximum voltage up to 12 v, below 25 mm diameter size.

Functions: it is widely used in various intelligent locks, such as Shared bicycle lock, fingerprint lock, glass lock, safe lock, hotel lock, family lock, inductive smart lock, etc

Features:China Electronic Lock Motor is based on micro precision reducer development, small intelligent micro precision reducer can do 10 mm in diameter, is widely used in safe, locks, smart locks, sensor intelligent lock;

This kind of motor has the characteristics of low noise, low energy consumption, small volume, light quality, high precision, large torque and durability

Method of use: the best stable in horizontal plane, installed on the China Electronic Lock Motor output shaft parts, cannot use a hammer to knock, knock prone to press into the dc Electronic Lock Motor drive, may cause damage to internal components, and cannot be used in the case of blocked.

Lock motor

Operating temperature range:

Electronic Lock Motor should be used at a temperature of -10~60℃.

The figures stated in the catalog specifications are based on use at  ordinary room temperature catalog specifications re based on use at ordinary room temperature  (approximately20~25℃.

If a electronic Lock Motor is used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.

Storage temperature range:

China Electronic Lock Motor should be stored ta a temperature of -15~65℃.

In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.

Service life:

The longevity of Electronic Lock Motor  is greatly affected by the load conditions , the mode of operation,the environment of use ,etc.Therefore,it is necessary to check the conditions under which the product will actually be used .The following conditions will have a negative effect on longevity.Please consult with us should any of them apply.

●Use with a load that exceeds the rated torque

●Frequent starting

●Momentary reversals of turning direction

●Impact loads

●Long-term continuous operation

●Forced turning using the output shaft

●Use in which the permitted overhang load or the permitted thrust load is exceeded

●A pulse drive ,e.g.,a short break,counter electromotive force,PWM control

●Use of a voltage that is nonstandard as regards the rated voltage

●Use outside the prescribed temperature or relative-humidity range,or in a special environment.

●Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.

when it come to volume production,we're a major player as well .each month,we rurn out  600000 units,all of which are compliant with the rohs directive.Have any questions or special needed, please contact us, we have the engineer group and best sales department to service to you

Looking forward to your inquiry. Welcome to our factory.

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Electronic Lock Motor

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Shenzhen Shunchang Motor Co., LTD. ,

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