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Ambient light sensor, VEML7700, I2C, 0-120 klx, 3-5V
Digital module for real-time measurement of ambient light, ideal for lighting automation, weather stations, greenhouses and IoT projects. Offers direct readings in lux via I2C, 16-bit conversion with fine resolution, wide range 0-120 klx extendable up to 167 klx and operates at 3.3-5V with low consumption.
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The VEML7700 digital ambient light sensor is a compact and precise module compatible with Arduino, STM32, ESP32, and other development boards with an I2C interface. It was designed for real-time light intensity measurement, providing values directly in lux through simple and reliable I2C communication.
The main features of this module include: 16-bit analog-to-digital conversion, a wide measurement range up to 120 klx with the possibility to extend up to 167 klx, very fine resolution of 0.0036 lx/ct, and accuracy of 0.005 lx/ct. The Filtron technology allows the sensor to approximate the spectral sensitivity of the human eye, and the O-Trim function ensures low tolerance between modules, guaranteeing consistent readings.
The module can be powered directly at 3.3V or 5V, making it easy to integrate into any project. The 3Vo pin provides a stabilized 3.3V output, usable for powering light peripherals. The extremely low power consumption — 45 µA in operation and 0.5 µA in shutdown — makes it suitable for battery-powered applications as well.
The module is ideal for lighting automation, weather stations, greenhouse light monitoring, and IoT projects that require stable and precise data about the ambient light intensity.
Specifications:
Sensor type: Digital, 16-bit
Supply voltage: 3.3 - 5 VDC
Operating current: 45 µA
Shutdown current: 0.5 µA
Measurement range: 0 - 120 klx (extendable up to 167 klx)
Resolution: 0.0036 lx/ct
Accuracy: 0.005 lx/ct
Output tolerance: < 10%
Interface: I2C
Operating temperature: -25 ~ 85°C
Dimensions: 16 x 17 mm
Layout and pinout:
| Pin Number | Pin Name | Pin Description |
|---|---|---|
| 1 (V) | VIN | Power supply 3.3–5 VDC |
| 2 (Vo) | 3Vo | 3.3V output, up to 100mA |
| 3 (G) | GND | Ground |
| 4 (SCL) | SCL | SCL, communication via I2C interface |
| 5 (SDA) | SDA | SDA, communication via I2C interface |
Usage:
After powering on, the sensor will continuously measure ambient light intensity. Readings are performed through the I2C interface, and values are provided in a 16-bit digital format.
| Condition | Light Intensity (lx) |
|---|---|
| Night | 0.001 – 0.02 lx |
| Night with moonlight | 0.02 – 0.3 lx |
| Cloudy indoors | 5 – 50 lx |
| Cloudy outdoors | 50 – 500 lx |
| Sunny indoors | 100 – 1000 lx |
| Sunlight at noon in summer | ~10⁶ lx |
| Reading light | 50 – 60 lx |
| Standard home video lighting | 1400 lx |
Arduino pinout:
| VEML7700 | Arduino |
|---|---|
| VIN | 5V or 3.3V |
| GND | GND |
| SCL | A5 SCL |
| SDA | A4 SDA |
| 3Vo | optional, do not connect to Arduino |
Use with the Adafruit_VEML7700.h library in the test code
Package contents:
1 x VEML7700 ambient light sensor
1 x Male header strip
Produs destinat utilizarii in proiecte electronice, automatizari, prototipare, educatie si cercetare.
Produsul trebuie utilizat numai conform specificatiilor tehnice mentionate in descriere si/sau in documentatia produsului.
Avertismente generale de siguranta:
Nu utilizati produsul la tensiuni, curenti sau temperaturi peste valorile specificate.
Montajul si conectarea trebuie realizate de persoane cu cunostinte tehnice minime in domeniul electric/electronic.
Evitati scurtcircuitele, inversarea polaritatii si conectarea gresita a alimentarii.
Nu lasati produsul alimentat nesupravegheat in timpul testelor.
Produsul nu este jucarie si nu este destinat copiilor.
Pentru modulele electronice, se recomanda utilizarea in carcase, panouri sau montaje protejate, dupa caz.
Identificare produs:
Denumirea produsului, codul/SKU-ul si caracteristicile tehnice sunt mentionate in pagina produsului si/sau pe eticheta ambalajului.
Producator / Importator / Distribuitor:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Website: www.sigmanortec.ro
Persoana responsabila in UE:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Documentatie si siguranta:
Pentru informatii suplimentare, fise tehnice, declaratii de conformitate sau instructiuni, ne puteti contacta la [email protected].
// VEML7700 Ambient Light Sensor - Basic Test
// Compatible with Arduino Uno, Nano, Mega and other I2C boards
// Library required: Adafruit_VEML7700 (install via Library Manager)
// Connections: VIN -> 5V, GND -> GND, SCL -> A5, SDA -> A4
#include <Wire.h>
#include "Adafruit_VEML7700.h"
Adafruit_VEML7700 veml = Adafruit_VEML7700();
void setup() {
Serial.begin(9600);
while (!Serial) delay(10);
Serial.println("VEML7700 Ambient Light Sensor Test");
if (!veml.begin()) {
Serial.println("ERROR: Sensor not found. Check wiring.");
while (1);
}
Serial.println("Sensor initialized successfully.");
veml.setGain(VEML7700_GAIN_1);
veml.setIntegrationTime(VEML7700_IT_100MS);
Serial.print("Gain: ");
switch (veml.getGain()) {
case VEML7700_GAIN_1: Serial.println("1"); break;
case VEML7700_GAIN_2: Serial.println("2"); break;
case VEML7700_GAIN_1_4: Serial.println("1/4"); break;
case VEML7700_GAIN_1_8: Serial.println("1/8"); break;
}
Serial.print("Integration time (ms): ");
switch (veml.getIntegrationTime()) {
case VEML7700_IT_25MS: Serial.println("25"); break;
case VEML7700_IT_50MS: Serial.println("50"); break;
case VEML7700_IT_100MS: Serial.println("100"); break;
case VEML7700_IT_200MS: Serial.println("200"); break;
case VEML7700_IT_400MS: Serial.println("400"); break;
case VEML7700_IT_800MS: Serial.println("800"); break;
}
}
void loop() {
float lux = veml.readLux();
Serial.print("Ambient light (lux): ");
Serial.println(lux, 4);
delay(500);
}
