6 kinds of alarm methods and program design common to single chip microcomputer

There are 6 common alarm methods.

(1) The indicator light or digital tube displays the data to remind the operator.
(2) Alarms using sound, light and voice. Among them, the light effect is usually taken from a light-emitting diode LED or other light source device; the sound effect can be taken from a bell, a electric whistle, a buzzer, or a music (speech) chip.
(3) Synthetic voice alarm. When using this method for alarming, the MCU application system will collect, process, synthesize and recognize the speech signal, so that the function of the alarm system is more perfect, and the alarm information is more specific, vivid and accurate until the specific information of the alarm object is given.
(4) Graphic and image alarms. This kind of system is equipped with a microcomputer-controlled printer or CRT display, so that the guards can see the alarm display screen or data and text while receiving other alarm signals. Not only can the alarm data be printed, but also can be easily archived.
(5) Alarm with control function. This kind of alarm system has control functions, such as: switching the automatic operation to manual operation in time to prevent accidents; when the alarm limit is reached, the actuator is activated; the telephone number is automatically dialed, and the alarm is reported to the relevant personnel.
(6) An alarm with a signal remote transmission function. The alarm signal can be transmitted to a long distance that the signal can reach for monitoring and control. Commonly used signal remote transmission methods are: infrared, laser, microwave, ultrasonic, cable carrier, radio transmission and so on. .
What is the common method of using the MCU application system for alarms?
The commonly used method is to send the collected data to the single-chip application system for processing, and compare with the upper and lower limits of the parameter. If the value exceeds the given value, the alarm is performed. Otherwise, it is displayed or controlled as a normal value. .
In the single-chip alarm system, what type of integrated circuit driver is commonly used for LEDs?
Since the driving current of the LED is 20~30mA, it cannot be directly started by the output of the TTL gate. In the MCU alarm system, the common driving method of LED is to drive with OC gate, such as 74LS06 or 74LS07.
What are the two programming methods for the MCU alarm system?
According to the alarm parameters and sensor division, simple alarm programs can be divided into two types: one is the full software alarm program, the other is the hardware application, and the software handles the alarm program.
How to use the full software alarm program to achieve alarm?
The basic method of the software program alarm program is: the measured parameters of the job site are sent to the MCU via sensors, transmitters, and analog-to-digital converters, and then compared with the specified upper and lower limits, according to the comparison results. Alarms or processing are performed, and the entire process is implemented by software.
How to implement alarm by hardware application and software processing alarm program?
When using this alarm method, the alarm request is not obtained by program comparison, but directly by the sensor. After the alarm is detected, the sensor sends an interrupt request to the CPU immediately. After the CPU responds to the interrupt, it immediately enters the interrupt service routine to realize the alarm or monitor the parameters and position. For example: electric contact pressure alarm, crane limit control, etc.
Which two programs can the alarm program be divided into according to the requirements of the parameters in the system?
The alarm program can be divided into simple over-limit alarm and alarm handler according to the requirements of the system and parameters.