In this project, I’ll demonstrate a simple circuit layout for building a switch that automatically turns on at night using one MOSFET and a few other minor parts I was able to recover from a real night lamp.
Components Required For Auto On Off Night Light:
- Mosfet IRFZ44N
- LDR(LIGHT DEPENDENT RESISTOR)
- RESISTOR 4.5Mohm
- load(in this case 12v led strip)
- Power supply(in this case 9v battery)
Step 1: Automatic Night Light Source
A nightlight is a small, typically electrical light fixture that is used to provide comfort or convenience in places that are dark or could become dark at particular times, such as at night or in an emergency. Tealights are little, long-burning candles used for a similar purpose.
- In this project, the MOSFET will be used to create a homemade night-activated switch.
- Since the goal of this project is to make things basic and inexpensive, we’ll use as many components as we can from THE CHEAP NIGHTLIGHT.
Step 2: Mosfet Transistor Projects
- This is the resistor I was referring to; but, if you use a ldr, you won’t need it.
- Just 100K will be enough.
- This is the resistor that I was talking about if you will use an LDR you will not need this resistor just 100K will be sufficient. Looks like an led is got pins like an LED +and – but is an LDR?
Step 3: Automatic Night Light Circuit Diagram
An energy-efficient lighting technique is known as “smart lighting.”
High-efficiency lighting fixtures and automated controls that adjust based on factors like occupancy or daylight availability may be part of this. Lighting is the purposeful use of light to produce a desired aesthetic or functional impact. It consists of general lighting, accent lighting, and task lighting.
Sounds wonderful, right? You can automate your home, garden, or anything else you desire with an inexpensive and effective smart lighting system that can be used everyday or in an off-grid setting if you choose.
Step 4: Dark Activated Switch Is Nearly There
A photoresistor, also known as an LDR or photo-conductive cell, is a variable resistor that is light-controlled. A photoresistor is photoconductive if its resistance lowers as the intensity of the incident light increases.
A photoresistor can be used in switching circuits that are light- and dark-activated as well as light-sensitive detector circuits.
The two later components are real semiconductor devices, however, a photoresistor is a passive component and lacks a PN-junction, making it less light-sensitive than photodiodes or phototransistors.
Any photoresistor’s photosensitivity can fluctuate greatly according to the surrounding temperature, rendering them unsuitable for uses that call for accurate measurement of or sensitivity to light photons.
Additionally, photoresistors show some lag, typically 10 milliseconds or less, between exposure to light and the subsequent drop in resistance. Even more noticeable lags, frequently up to one second, occur when switching between light and dark surroundings. Although they are inappropriate for sensing quickly flashing lights, this characteristic is occasionally utilized to mellow the response of audio signal compression.
Step 5: Light Depending Resistor
Alternatively known as an LDR, photoresistor, photoconductor, or photocell, a light-dependent resistor (LDR) is a variable resistor whose value decreases with rising incident light intensity.
A semiconductor with a high resistance makes up an LDR. When photons are absorbed by a semiconductor at a frequency high enough, bound electrons have the energy to leap into the conduction band. The resulting free electron conducts electricity, decreasing resistance together with its hole partner.
Step 6: AUTOMATIC ON OFF Circuit Diagram
We only used one mosfet, a photoresistor, and a 4.5M resistor in the automatic night light switch circuit.
Simply use your creativity to create a box or enclosure to house all the wires and the MOSFET transistor. You may use old plastic items that you no longer use; in the video, I used an enclosure from a cheap power bank, but you can also use a tic-tac box, Nivea hand cream, and other items. I appreciate everyone reading and I’ll see you on the channel.
