In the previous microcomputer control system and industrial production, in order to ensure production safety, some important parameters or system components set up an emergency alarm system, in order to remind the staff attention and take corresponding emergency measures to ensure the safety of equipment and workers. In this method, the data collected by the sensor is scaled and compared with the upper and lower limits previously set. If it is within the alarm range, it will display and control the normal value for sampling. The dividing design USES an alarm circuit designed by cicadas. The design of cicada buzzer alarm circuit only needs to use the pressure type buzzer, and then through a 51 single chip microcomputer I0 port through the driver buzzer alarm sound can achieve alarm function. Piezoelectric buzzer current 10ma, we can use tt1 integrated circuit 7406 or 7407 low level buzzer, also can choose? The product is driven by the pole tube.In the figure, the FM signal terminal is connected to the microcontroller P2. 0io port, the other end is connected to the transistor base. 0 output, high level, transistor, piezoelectric buzzer to obtain working voltage buzzer: when p2. When the output power is low, the transistor is cut off and the buzzer does not work.This design is for the temperature and humidity in the measurement of temperature and humidity on the upper limit exceeding the alarm, connected with I "at the MCU AT89C51 P2.0. When the temperature and humidity pass the limit, the P2.0 port is set to 0 and the system starts to work.
In the previous microcomputer control system and industrial production, in order to ensure production safety, some important parameters or system components set up an emergency alarm system, in order to remind the staff attention and take corresponding emergency measures to ensure the safety of equipment and workers. In this method, the data collected by the sensor is scaled and compared with the upper and lower limits previously set. If it is within the alarm range, it will display and control the normal value for sampling. The dividing design USES an alarm circuit designed by cicadas. The design of cicada buzzer alarm circuit only needs to use the pressure type buzzer, and then through a 51 single chip microcomputer I0 port through the driver buzzer alarm sound can achieve alarm function. Piezoelectric buzzer current 10ma, we can use tt1 integrated circuit 7406 or 7407 low level buzzer, also can choose? The product is driven by the pole tube.<br>In the figure, the FM signal terminal is connected to the microcontroller P2. 0io port, the other end is connected to the transistor base. 0 output, high level, transistor, piezoelectric buzzer to obtain working voltage buzzer: when p2. When the output power is low, the transistor is cut off and the buzzer does not work.<br>This design is for the temperature and humidity in the measurement of temperature and humidity on the upper limit exceeding the alarm, connected with I "at the MCU AT89C51 P2.0. When the temperature and humidity pass the limit, the P2.0 port is set to 0 and the system starts to work.
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