Waking up in the morning is quite a task for many people. The aim of this project is to build an alarm clock which will help people go get up a little bit easier. Additionally if one forgets to set alarm at night, this alarm will turn on automatically in the morning and only turn off manually so you will have to wake up.
As we know that LDR is a light dependant resistor is a variable resistor whose resistance depends on the intensity of light. LDR will be used to turn the buzzer on and off. This is economical and easy to make. It can be adjusted at a particular time after the rise of the sun.
Hardware Components
For a detailed description of pinout, dimension features, and specifications download the datasheet of Smart Morning Alarm Circuit
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | DC Supply | 5v-12v | 1 |
| 2. | IC | NE555 Timer | 2 |
| 3. | Electrolytic Capacitor | 220uf,10uf | 5 |
| 4. | Ceramic Capacitor | 0.u1f | 1 |
| 5. | Transistors | 2n3904 | 1 |
| 6. | Resistors | 1K, 10K, 220K, 270K, 560K, 1M, 10K Var | 1 |
| 7. | LDR | – | 1 |
| 8. | Piezo Buzzer | – | 1 |
NE555 IC Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 555 Timer
Smart Morning Alarm Circuit
Working Explanation
LDR will turn the buzzer on and off by changing its resistance which will be the result of a change in the intensity of light falling on the surface of LDR. Normally LDR has high resistance when light falls on its surface its resistance decreases. When resistance will decrease it allows the transistor to conduct. As a result, this buzzer will be turned on and it can only be turned off manually. Capacitor (Cx1) will be used for time adjustment and Capacitor (Cx2) will be used to adjust the length of the alarm.
Applications and Uses:
This alarm can be used by people to wake up early in the morning.
