This project briefs about automatic street lights utilizing a 555 timer IC. The circuit will automatically enact a 230V lamp at sunset and automatically switch it OFF when the sun rises.
The circuit is exceptionally basic and simple to assemble. These project components are easily accessible in the market at cheap prices. The turning ON/OFF of the light can be switched physically by utilizing a switch at a point where there is a need for light. Here we have structured a framework where there is automatically turning ON and OFF of the light at whatever point requires.
At the point when darkness detects, then the sensor circuit gets actuated and turns ON consequently. And when there is another source of light during the daytime, the road light gets OFF. Additionally, this circuit can be utilized to modify the affectability of the light. The circuit is basic and dependent on 555 timer IC and LDR.
Hardware Components
The following components are required to make an Automatic Street Light Circuit
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1. | IC | NE555 timer | 1 |
| 2. | TRIAC | BT136 | 1 |
| 3. | Diodes | 1N4007 | 4 |
| 4. | Zener diode | 12V 1W | 1 |
| 5. | LDR | – | 1 |
| 6. | AC Lamp | 230V | 1 |
| 7. | Variable Resistor | 10K | 1 |
| 8. | Resistor | 470Ω, 1M/1W | 1, 1 |
| 9. | Ceramic Capacitor | 330nF, 0.01µF | 1, 1 |
| 10. | Electrolytic Capacitor | 330µF | 1 |
| 11. | AC Power Supply or AC adapter | 220V | 1 |
555 IC Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 555 Timer
BT136 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of BT136
Automatic Street Light Circuit
Working Explanation
This project does not operate from a transformer. The circuit is utilizing a 330nF 400V capacitor that drops the AC mains. This dropped voltage is then redressed by the 1N4007 diode bridge and filtered by the 330uF electrolytic capacitor. After filtration, this voltage steps down somewhere around the 12V Zener diode and lastly goes to the dark sensor circuit worked with the 555 timer IC.
The circuit is really a Schmitt trigger sort and it has a low information current of 1.5uA. The LDR in the circuit is utilized to detect the dimness. At the point when the darkness will fall beneath the preset value set by the 10K variable resistor then the yield of the 555 IC turns out to be high and switch ON the BT136 triac, which initiates the 230V lamp.
Applications and Uses
- This is an economical and automatic street light controller circuit dependent mainly on the 555 timers and an LDR.
- Aside from the road lights, this circuit can be utilized in territories where you have to control anything on the light premise
