Laser Controlled ONOFF Switch

Description: This circuit is constructed around a 555 timer and utilizes very few components. Due to its simplicity, even beginners can easily assemble and use it as a control device. A readily available laser pointer can be employed to operate this device. The circuit has been tested under operational conditions from a distance of 500 meters and is capable of functioning effectively, although it can be controlled from even greater distances. Aiming the laser beam precisely onto the Light Dependent Resistor (LDR) presents a practical challenge. This circuit is particularly useful for turning a fan on or off at night without having to leave the bed. Additionally, it can be utilized to control various other devices such as radios or music systems. However, the circuit is limited to operation in dark or dimly lit environments. By directing the laser beam onto LDR1, the connected device can be activated through a relay, while directing the beam onto LDR2 will deactivate the device. The timer is configured to operate in bistable mode. Laser pointers are available for under Rs 150 in the market, and the total cost of the circuit is less than Rs 50.

The circuit employs a 555 timer in bistable mode, allowing it to toggle between two stable states, which is ideal for applications requiring on/off control. The LDRs (Light Dependent Resistors) serve as the primary sensors in this setup, responding to the laser beam's light. When the laser beam strikes LDR1, it triggers the 555 timer to activate the relay, which subsequently powers the connected device. Conversely, when the beam is directed at LDR2, the timer switches off the relay, cutting power to the device.

The circuit's simplicity not only makes it accessible for novices but also ensures reliability in various applications. The operational range of 500 meters, under optimal conditions, showcases its effectiveness in remote control scenarios. However, it is important to note that the circuit's performance is contingent upon adequate lighting conditions, as it relies on the contrast between the laser light and ambient light levels.

In practical terms, the circuit can be applied in home automation for controlling fans, lights, or entertainment systems, providing convenience without the need for physical interaction with the devices. The low cost of components further enhances its appeal, making it a feasible project for hobbyists and DIY enthusiasts. Overall, this circuit exemplifies a straightforward yet effective solution for remote device control using basic electronic components.This circuit is built around a 555 timer using very few components. Since the circuit is very simple, even a novice can easily build it and use it as a controlling device. A laser pointer, now easily available in the market, can be used to operate this device. This circuit has been tested in operational conditions from a distance of 500 metres and was found to work satisfactorily, though it can be controlled from still longer distances. Aiming (aligning) the laser beam exactly on to the LDR is a practical problem. The circuit is very useful in switching on/off a fan at night without getting off the bed. It can also be used for controlling a variety of other devices like radio or music system. The limitation is that the circuit is operational only in dark or dulllit environments. By focussing the laser beam on LDR1 the connected gadget can be activated through the relay, whereas by focussing laser beam on LDR2 we can switch off the gadget. The timer is configured to operate in bistable mode. The laser pointers are available for less than Rs 150 in the market. The cost of the actual circuit is less than Rs 50. Be the first of your friends to get free diy electronics projects, circuits diagrams, hacks, mods, gadgets & gizmo automatically each time we publish.

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