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The resistance of 20mm GL20528 Light Sensitive Photoresistor LDR changes with the change in the ambient light exposed on the surface of the sensor. As the light on the sensor increases then the resistance across the two leads decreases. Light Dependent Resistor is a type of photocell which finds excellent use in light sensing device application, whether it is automatic outdoor light ON/OFF switch or indoor automatic light switch; moreover, the 12mm LDR or photoresistor sensor works best in both light and dark regions. The photo-resistor is a staple of electronics. If you need a way to sense the level of ambient light, then there is no easier way to do it without an LDR/photo-resistor.

Two Cadmium Sulphide Photo Conductive Cells with spectral responses similar to that of the human eye. Cell resistance falls with increasing light intensity. Applications of this product include smoke detection, automatic lighting control, batch counting, and burglar alarm systems. Furthermore, some of the applications are given below.

Analog Applications :

• Camera exposure control
• Auto slide focus – dual cell
• Photocopy machines – the density of the toner
• Colorimetric test Equipment
• Densitometer
• Electronics scales – dual cell
• Automatic gain control – modulated light source
• Automated rearview mirror

Digital Applications :

• Automatic headlight dimmer
• Nightlight control
• Oil burner flame out
• Streetlight control
• Absence/presence (beam breaker)
• Position sensor

Other Applications :

• Annunciator
• Camera automatic photometry
• Electronic toy
• Industrial control
• Light control
• Light control lamp
• Photoelectric control
• Switch

• Coated with epoxy
• Good reliability
• High sensitivity
• Small volume
• Fast response
• Good spectrum characteristic
• Model: GL20528 ( GM20528 )
• Size: 20mm
• Max. voltage: 500 VDC
• Max. power: 500 mW
• Spectrum Peak Value (nm): 560
• Light resistance ( KΩ) : 10–20 kΩ
• Dark resistance ( KΩ): 2 kΩ.
• Υ value : 0.6.
• Increase response time: 30 mS.
• Decrease response time: 30 mS

• 1 x 20mm GL20528 Light Sensitive Photoresistor LDR

Analog PIR sensor is widely used for ceiling lamps and has a large detection angle. The pyroelectric infrared sensor detects infrared radiation on the basis of the characteristics that the polarization of pyroelectric material changes with temperature.

                                                   Field of View

• Low power consumption
• Wide-angle
• Slight movement can be detectable

• Ceiling Lamps
• Home security systems
• Home Alarm System. As its ability to sense warm, moving objects such as people walking into a room is coupled with simplicity and cost-effectiveness

• 1 x Analog PIR Sensor

Product Details:

• Triacs Belong To The Thyristor Family And Are Closely Related To Silicon-Controlled Rectifiers (Scr). However, Unlike Scrs, Which Are Unidirectional Devices (I.E. Can Conduct Current Only In One Direction), Triacs Are Bidirectional And So Current Can Flow Through Them In Either Direction.
•  Another Difference From Scrs Is That Triacs Can Be Triggered By Either A Positive Or A Negative Current Applied To Its Gate Electrode, Whereas Scrs Can Be Triggered Only By Currents Going Into The Gate. In Order To Create A Triggering Current, A Positive Or Negative Voltage Has To Be Applied To The Gate With Respect To The A1 Terminal (Otherwise Known As Mt1).

• Once Triggered, The Device Continues To Conduct Until The Current Drops Below A Certain Threshold, Called The Holding Current.

• The Bidirectionality Makes Triac Very Convenient Switches For Ac Circuits, Also Allowing Them To Control Very Large Power Flows With Milliampere-Scale Gate Currents. In Addition, Applying A Trigger Pulse At A Controlled Phase Angle In An Ac Cycle Allows One To Control The Percentage Of Current That Flows Through The Triac To The Load (Phase Control), Which Is Commonly Used, For Example, In Controlling The Speed Of Low-Power Induction Motors, In Dimming Lamps And In Controlling Ac Heating Resistors

•  Mobile App Based Dimming- The Customer Sitting In Any Part Of The Room/ House Can Control The Intensity Of The Light By Using His Mobile App
•  The Manual Mode Facilitates Control By Varying The Triac Manually Through The Knob Provided In The Control Unit.

•  Wifi App Based Dimming
•  Occupancy Based Dimming

Product Details:

TRIACs belong to the thyristor family and are closely related to Silicon-controlled rectifiers (SCR). However, unlike SCRs, which are unidirectional devices (i.e. can conduct current only in one direction), TRIACs are bidirectional and so current can flow through them in either direction. Another difference from SCRs is that TRIACs can be triggered by either a positive or a negative current applied to its gate electrode, whereas SCRs can be triggered only by currents going into the gate. In order to create a triggering current, a positive or negative voltage has to be applied to the gate with respect to the A1 terminal (otherwise known as MT1).
Once triggered, the device continues to conduct until the current drops below a certain threshold, called the holding current.
The bidirectionality makes TRIAC very convenient switches for AC circuits, also allowing them to control very large power flows with milliampere-scale gate currents. In addition, applying a trigger pulse at a controlled phase angle in an AC cycle allows one to control the percentage of current that flows through the TRIAC to the load (phase control), which is commonly used, for example, in controlling the speed of low-power induction motors, in dimming lamps and in controlling AC heating resistors.

TWO Modes of LED PANEL LIGHT DIMMING:

• Mobile APP based dimming- The customer sitting in any part of the room/ house can control the intensity of the light by using his mobile app
• The manual mode facilitates control by varying the triac manually through the knob provided in the control unit.

Optional:

• wifi App based dimming
•  Occupancy based dimming