Schematic diagram of alarm generator circuit based on C51 single chip microcomputer

Single chip microcomputer STM32L151CCU6

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Use P1.0 to output 1KHz and 500Hz audio signals to drive the speaker to make an alarm signal. It requires 1KH z signal to sound 100ms, 500Hz signal to sound 200ms, alternately, P1.7 is connected to a switch for control, when the switch is closed, the alarm signal is activated. When the switch disconnects the alarm signal to stop, the program is programmed.

(1. Connect the P1.0 port in the “Microcontroller System” area to the SPK IN port in the “Audio Amplifier Module” area;

(2. Connect a 8 ohm or 16 ohm speaker to the SPK OUT port in the “Audio Amplifier Module” area;

(3. Wire the P1.7/RD port in the "Microcontroller System" area to the K1 port in the "4-way toggle switch" area.