As shown in the figure for the light off reminder circuit. The circuit is composed of a monostable delay circuit, a drive circuit, a buzzer, a light-emitting diode and so on. The output signal of the monostable delay circuit composed of 555 and R1 and C3 controls the work of the following circuit.
After turning on the light, the power from the direction light relay in the circuit is added to the pin 555 through the diode, so that the capacitor C3 is charged through R1. As the charging progresses, the foot potential rises. When the foot potential reaches 2 / 3VDD (about 1 minute delay), 555 reverses, and the low level of the foot output makes BG turn on. The LED is driven to emit light accordingly, and the buzzer sounds. The sound and light signal reminds the driver to turn off the light in time.
The length of time that the light in the circuit lights up corresponds to the delay time of the circuit, which can be changed by adjusting the time constant R1C3.
The circuit realizes that when the driver forgets to turn off the turn signal, the driver is reminded to turn off the power in time.
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