Design with HW-486 LDR Photo Resistor in Cirkit DesignerThe HW-486 LDR Photo Resistor, manufactured by AZ-Delivery, is a light-dependent resistor that changes its resistance based on the intensity of light falling on it. This component is widely used in light sensing and control applications, such as automatic lighting systems, light meters, and electronic circuits requiring light detection.
This circuit is a light-sensitive relay switch that uses a photocell (LDR) to control a 12V relay via a BC547 transistor. The relay is powered by a 12V battery, and the transistor acts as a switch that is triggered by the resistance change in the LDR, which is influenced by the ambient light level.
Open Project in Cirkit Designer
This circuit uses an Arduino UNO to read light intensity from a photoresistor (LDR) and display the light level on a 16-pin LCD. The LCD is controlled via digital pins, and the LDR's analog signal is processed to determine the light level, which is then displayed as 'Light' or 'Dark' along with the lux value.
Open Project in Cirkit Designer
This circuit uses an Arduino UNO to read the light intensity from a KY-018 LDR Photo Resistor. The LDR is powered by the Arduino's 5V and GND pins, and its signal output is connected to the Arduino's analog input pin A0.
Open Project in Cirkit Designer
This circuit is designed to measure ambient light levels using a photocell (LDR) and adjust the brightness of an LED accordingly. The photocell and a 10kΩ resistor form a voltage divider connected to the Arduino's analog input A0, while the LED is driven by digital pin D11 through a 220Ω current-limiting resistor. The Arduino's firmware reads the light level, inverses the value to increase LED brightness as it gets darker, and outputs a corresponding PWM signal to control the LED intensity.
Open Project in Cirkit DesignerThe HW-486 LDR Photo Resistor is designed for reliable performance in light-sensing applications. Below are its key technical details:
| Parameter | Value |
|---|---|
| Manufacturer | AZ-Delivery |
| Part ID | HW-486 |
| Resistance (Dark) | 1 MΩ (typical) |
| Resistance (Light) | 10 kΩ to 20 kΩ (at 10 lux) |
| Maximum Voltage | 150 V |
| Power Dissipation | 100 mW |
| Spectral Peak | 540 nm |
| Response Time (Rise) | 20 ms |
| Response Time (Fall) | 30 ms |
| Operating Temperature | -30°C to +70°C |
The HW-486 LDR is a two-terminal device with no polarity. The terminals are interchangeable and can be connected in either orientation. Below is a description of the pins:
| Pin | Description |
|---|---|
| Pin 1 | Connects to one side of the circuit |
| Pin 2 | Connects to the other side of the circuit |
The HW-486 LDR Photo Resistor is simple to use in a variety of circuits. Below are the steps and considerations for integrating it into your project:
Below is an example of how to use the HW-486 LDR in a voltage divider circuit to measure light intensity with an Arduino UNO:
// Define the analog pin connected to the LDR
const int ldrPin = A0; // LDR connected to analog pin A0
void setup() {
Serial.begin(9600); // Initialize serial communication at 9600 baud
}
void loop() {
int ldrValue = analogRead(ldrPin); // Read the analog value from the LDR
Serial.print("LDR Value: ");
Serial.println(ldrValue); // Print the LDR value to the Serial Monitor
delay(500); // Wait for 500 ms before the next reading
}
Explanation of the Code:
analogRead() function reads the voltage at the pin, which corresponds to the light intensity.No Change in Output:
Incorrect Readings:
Component Overheating:
Slow Response:
Q1: Can the HW-486 LDR detect infrared light?
A1: The HW-486 LDR is most sensitive to visible light with a spectral peak at 540 nm. It has limited sensitivity to infrared light.
Q2: Can I use the HW-486 LDR in outdoor applications?
A2: Yes, but ensure the operating temperature is within the range of -30°C to +70°C. Protect the LDR from moisture and extreme weather conditions.
Q3: What is the lifespan of the HW-486 LDR?
A3: The HW-486 LDR has a long lifespan when operated within its specified ratings. However, prolonged exposure to high-intensity light or extreme conditions may degrade its performance over time.
Q4: Can I use the HW-486 LDR with a digital input pin?
A4: No, the LDR outputs an analog signal. Use an analog-to-digital converter (ADC) or connect it to an analog input pin of a microcontroller.
By following this documentation, you can effectively integrate the HW-486 LDR Photo Resistor into your projects and troubleshoot common issues with ease.