Light Dependent Resistor - LM393
<p class="normal"><span lang="EN">Light Dependent Resistor - LM393 -LDR’s resistance is very high in the darkness, almost as high as 1MΩ but when there is the light that falls on the LDR, the resistance falls down to a few K (10-20KΩ @ 10 lux, 2-4K @ 100 lux) depending on the model.</span></p> <p class="normal"><span lang="EN">The module produces an output voltage according to the resistance of the LDR and is made available at Analog Output (AO) pin. The same signal is fed to an LM393 High Precision Comparator to digitize it and is made available at a Digital Output (DO) pin. The module has a built-in potentiometer for sensitivity adjustment of the digital output (DO). </span></p> <p class="normal"><span lang="EN">You can set a threshold by using a potentiometer; So that when the incident light level on the LDR exceeds the threshold value, the module will output LOW otherwise HIGH. </span><span lang="EN">Apart from this, the module has two LEDs. The Power LED will light up when the module is powered. The Status LED will light up when the digital output goes LOW.</span></p>
<p class="normal"><span lang="EN">Light Dependent Resistor - LM393 -LDR’s resistance is very high in the darkness, almost as high as 1MΩ but when there is the light that falls on the LDR, the resistance falls down to a few K (10-20KΩ @ 10 lux, 2-4K @ 100 lux) depending on the model.</span></p> <p class="normal"><span lang="EN">The module produces an output voltage according to the resistance of the LDR and is made available at Analog Output (AO) pin. The same signal is fed to an LM393 High Precision Comparator to digitize it and is made available at a Digital Output (DO) pin. The module has a built-in potentiometer for sensitivity adjustment of the digital output (DO). </span></p> <p class="normal"><span lang="EN">You can set a threshold by using a potentiometer; So that when the incident light level on the LDR exceeds the threshold value, the module will output LOW otherwise HIGH. </span><span lang="EN">Apart from this, the module has two LEDs. The Power LED will light up when the module is powered. The Status LED will light up when the digital output goes LOW.</span></p>
Comparator – LM393
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LM393 - Comparator Module
LM393 - Comparator Module
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Light Dependent Resistor – LM393

Light Dependent Resistor – LM393 -LDR’s resistance is very high in the darkness, almost as high as 1MΩ but when there is the light that falls on the LDR, the resistance falls down to a few K (10-20KΩ @ 10 lux, 2-4K @ 100 lux) depending on the model.

The module produces an output voltage according to the resistance of the LDR and is made available at Analog Output (AO) pin. The same signal is fed to an LM393 High Precision Comparator to digitize it and is made available at a Digital Output (DO) pin. The module has a built-in potentiometer for sensitivity adjustment of the digital output (DO).

You can set a threshold by using a potentiometer; So that when the incident light level on the LDR exceeds the threshold value, the module will output LOW otherwise HIGH. Apart from this, the module has two LEDs. The Power LED will light up when the module is powered. The Status LED will light up when the digital output goes LOW.

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Description

Description

The Digital LDR Module is used to detect the presence of light / measuring the intensity of light. The output of the module goes high in the presence of light and it becomes low in the absence of light. The sensitivity of signal detection can be adjusted using the potentiometer.

Use it to detect the light brightness in your environment and decide to switch OFF or ON light? Or maybe to adjust the brightness of the LED of your house?
You can adjust the threshold (sensitivity) of the digital output by tuning the onboard variable resistor (potentiometer). Simple usage as it is the digital output, so you will know is the light present and decide what to do with it. It comes with an M3 mounting hole for ease of attaching it to an object. Onboard, it provides an LDR, high sensitivity and commonly being used for light detection. The module comes with a power LED and a status LED as an indicator.LDR Module Photosensitive resistor module most sensitive to environmental light intensity is generally used to detect the ambient brightness and light intensity.
How it works
  • Module light conditions or light intensity reach the set threshold, DO port output high when the external ambient light intensity exceeds a set threshold, the module D0 output low;
  • Digital output D0 is directly connected to the MCU, and detect high or low TTL, thereby detecting ambient light intensity changes;
  • The digital output module DO  can directly drive the relay module, which can be composed of a photoelectric switch.
Pin details
  • VCC ↔ 3.3V to 5V DC.
  • GND ↔ Ground.
  • DO ↔ Digital Output.
Features:ADIY LDR Module
  • LM393-based design.
  • It can detect ambient brightness and light intensity.
  • Adjustable sensitivity (via blue digital potentiometer adjustment).
  • Output Digital – 0V to 5V, Adjustable trigger level from preset.
  • LEDs indicating output and power.
  • Mounting hole
  • Power and Signal indicator LED
  • Analog and Digital Out
  • Adjustable threshold (via potentiometer)
  • Input Voltage (V): 3.3 to 5
Package Includes :
1 x LDR Module.

Resources

  1. Usage Guide (Check “The Module” section)
  2. LM393, Dual Comparators datasheet
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