Witty Fox - OPT3001 Digital Ambient Light Sensor | Precise LUX meter sensor

Witty Fox - OPT3001 Digital Ambient Light Sensor | Precise LUX meter sensor

Overview

The Witty Fox OPT3001 Digital Ambient Light Sensor is a high-precision light sensor that measures ambient light levels in lux (lx). It is a versatile and accurate sensor suitable for various applications, including IoT, robotics, home automation, and more.

Technical Specifications

Supply Voltage: 1.8V to 3.6V
 Communication Interface: I2C
 Measurement Range: 0.01 lux to 83,000 lux
 Resolution: 16-bit
 Accuracy: 5% (typical)
 Response Time: < 100 ms
 Operating Temperature: -40C to 85C

Pinout

The sensor has a standard 6-pin I2C interface:

| Pin | Function |
| --- | --- |
| VCC | Power Supply (1.8V to 3.6V) |
| GND | Ground |
| SCL | I2C Clock |
| SDA | I2C Data |
| INT | Interrupt Output |
| ADDR | I2C Address (optional) |

Code Examples

### Example 1: Basic Light Level Measurement (Arduino)

```cpp
#include <Wire.h>

#define OPT3001_ADDRESS 0x23  // Default I2C address

void setup() {
  Serial.begin(9600);
  Wire.begin();
}

void loop() {
  uint16_t result = readLightLevel();
  Serial.print("Light level: ");
  Serial.print(result);
  Serial.println(" lux");
  delay(1000);
}

uint16_t readLightLevel() {
  uint16_t data = 0;
  Wire.beginTransmission(OPT3001_ADDRESS);
  Wire.write(0x01);  // Register address for light measurement
  Wire.endTransmission();
  Wire.requestFrom(OPT3001_ADDRESS, 2);
  data = Wire.read() << 8;
  data |= Wire.read();
  return data / 100.0;  // Convert to lux (divide by 100)
}
```

### Example 2: Automatic LED Brightness Adjustments (Raspberry Pi - Python)

```python
import smbus

bus = smbus.SMBus(1)  # I2C bus 1
opt3001_address = 0x23

while True:
    bus.write_byte(opt3001_address, 0x01)  # Register address for light measurement
    data = bus.read_word_data(opt3001_address, 0x01)
    light_level = data / 100.0

if light_level < 100:
        led_brightness = 255  # Maximum brightness
    elif light_level < 500:
        led_brightness = 128  # Medium brightness
    else:
        led_brightness = 0  # Minimum brightness

# Adjust LED brightness using PWM or other methods
    print("Light level: {:.2f} lux, LED brightness: {}".format(light_level, led_brightness))
    time.sleep(1)
```

### Example 3: Interrupt-based Light Threshold Detection (ESP32 - C/C++)

```cpp
#include <WiFi.h>
#include <Wire.h>

#define OPT3001_ADDRESS 0x23
#define INTERRUPT_PIN 2  // ESP32 GPIO 2 as interrupt pin

volatile bool lightThresholdReached = false;

void IRAM_ATTR isr() {
  lightThresholdReached = true;
}

void setup() {
  pinMode(INTERRUPT_PIN, INPUT_PULLUP);
  attachInterrupt(INTERRUPT_PIN, isr, FALLING);
  Wire.begin();
}

void loop() {
  if (lightThresholdReached) {
    lightThresholdReached = false;
    uint16_t lightLevel = readLightLevel();
    if (lightLevel < 100) {
      Serial.println("Low light level detected!");
      // Take action, e.g., turn on a LED
    }
  }
  delay(10);
}

uint16_t readLightLevel() {
  uint16_t data = 0;
  Wire.beginTransmission(OPT3001_ADDRESS);
  Wire.write(0x01);  // Register address for light measurement
  Wire.endTransmission();
  Wire.requestFrom(OPT3001_ADDRESS, 2);
  data = Wire.read() << 8;
  data |= Wire.read();
  return data / 100.0;  // Convert to lux (divide by 100)
}
```

These examples demonstrate how to interact with the Witty Fox OPT3001 Digital Ambient Light Sensor using different microcontrollers and programming languages. They cover basic light level measurements, automatic LED brightness adjustments, and interrupt-based light threshold detection.