vividvilla
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Often Garden Lights are made by high watt electric bulbs which increases the power consumption ,In order to solve this problem we built a smart garden light which is built by 32 yellow LED’s hence the power consumption is very Less.This smart Garden light can be set to any light intensity below which the Garden Light switches ON.Regulation was needed to maintain a constant light and a simple switch-mode device type LM2575 (5V version) was chosen to save power. This device, IC2, uses step-down mode, which has about 10% higher efficiency than step-up mode. Four components, D3, C6, C7 and inductor L1 are needed for IC2 to operate in this mode. The output voltage is regulated at 5V. Resistor R5 allows C6 and C7 to discharge when the 12V power supply is removed.
The circuit around IC2 provides power to illuminate the l.e.d.s (D4 to D35). These are connected in pairs, each pair having a ballast resistor (R6 to R21). The l.e.d.s were arranged in groups of eight assembled on four sub-circuit boards, providing four facets for the garden light.
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