anti sleep alarm for students abstract
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#2
Most accidents on the roads during the night occur because of the bad vision of the drivers caused by the continuous exposure of their eyes to the bright light of the headlights of vehicles approaching. Poor vision is due to depletion of the visual pigment in the eyes, which induces sleep to restore the pigment. This anti-sleep alarm keeps you awake. This circuit keeps you alert when beeping intermittent beeps and flashing to remind you that you are not in bed but driving a vehicle. It operates only at night due to the control of a switch based on the light dependent resistance (LDR).

Anti-Sleep Alarm Circuit

The LDR together with two BC548 transistors (T1 and T2) forms the light switch to inhibit the oscillation of IC1 during the day. As the LDR is exposed to light during the day, T1 leads to keep T2 out of driving. This causes the reset pin (pin 12) of IC1 to be high to prevent oscillation. Therefore, the remaining part of the circuit remains in the standby mode.

[Image: 2A7_6AD_1.jpg]

At night, T1 remains non-conductive as the LDR is in darkness. Transistor T2 leads to grounding the reset pin (pin 12) of IC1. This initiates the oscillations of IC1, which is indicated by the blinking of LED1. The internal oscillator of the binary counter IC CD4060 oscillates at a frequency based on the values of R5, R6 and C1. Its output Q13 becomes high and goes down alternately for 15 minutes each. Using VR1 potmeter, you can adjust the sensitivity of the LDR.
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