5 Awesome Mini Project Ideas to Start

1. Water Level Alarm Circuit

This circuit is brought into play to generate an alarm bell or light, when the height of water climbs beyond a certain level. This circuit makes use of a fundamental astable multi-vibrator prepared from an IC with 555timer. A resistance checks out is located on the tip at which the alarm has to be set ON, the moment the water goes up to that level, alarm starts to ring. The amount of constituents required for this circuit is incredibly less and can be effortlessly accumulated on a PCB.



2. Low Cost Fire Alarm Circuit

This circuit is bring into play for spotting a fire and creating an alarm, therefore awaking the populace in the premises where it is incorporated. A sensor transistor named BC177 is brought use of to sense the temperature formed owing to the fire. A predetermined temperature level can be held in reserve for the transistor. The moment the temperature increases over the predetermined temperature level, the escape current of the transistor mounts, as a consequence driving other transistors in the circuit.  A relay is also making use of to turn the bell load as its output. The constituents desired for the circuit can be attained effortlessly and the circuit is simple to intend.



3. Electronic Card Lock System

The circuit existing here can be employed as a security device (Lock) for vital electronic or electrical machines. When card is popped inside the machine, depending on the situation of the hole punched on the card, a precise machine would be turned ON. The card is introduced in the machine just like an ATM card inserted inside the ATM machine slot. This card is rectangular in shape with just one hole punched on it. The electronic card circuit brings into play eight photo-transistors (T1 to T8). When no card is there in the lock, illumination from luminous lantern L1 of 40- watt & 230V drops on all the photo- transistor sensors. If a wrong attempt of inserting the card is made, then the card will not go inside machine completely and thereby the system will not be unlocked.



4. Emergency Light Mini Project

This is a Light Dependent Resistor based Emergency Light that switches on a high watt white LED when the room is dark. It can also be brought into play as a simple emergency lamp in the kid’s room to steer clear of the panic situations in the event of unexpected current failure. It provides sufficient glow in the room. The circuit of Emergency Light is simple so that it can be created in a tiny box. A 12 volt tiny battery is made use of to give power supply to the circuit. T1 and T2 are two transistors employed as electronic keys to switch ON or OFF the white LED.



5. Street Light Circuit

This small mini project is employed to intend a street light that glows up when night drops and mechanically switch OFF with the crack of dawn. In order to sense the amount of daylight that is desired to settle on when to discontinue the circuit and afterward stimulate it. This is done with the aid of a sensor named as LDR (Light Dependent Resistor). The key theory employed at the back of the Light Dependent Resistor is that, the existence of light causes the sensor’s resistance to go low & again brighten up. You can adjust the circuit by inserting LED’s as a substitute of the 230 volt light. This street light circuit is relatively simple to intend, and additional alterations can be done as per your choice.


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