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In Lesson 2, we learned how to use browser send control signal to a remote Arduino device and turn On/Off an LED. In this lesson, we’ll show how to read remote sensor data to your browser. We will use a photoresistor(light sensor) to read remote environment light value. This is very useful in farms, greenhouses to control the light of plants.

Arduino UNO board x 1

OSOYOO ESP8266 WIFI Shield x 1

Photoresistor sensor Module x 1

USB cable x 1

Jumper wires several ​

First, please insert the ESP8266 wifi Shield into your UNO board,

Make sure jumper cap connected E_TX to D4 and E_RX to D5.

Connect your Photoresistor with Uno as following diagram,

A couple of notes before you get started:

Arduino UNO Board Photoresistor sensor module
A0 S
5V +

Step A) Install latest Arduino IDE (If you have Arduino IDE version after 1.1.16, please skip this step).

Download Arduino IDE from, then install the software.

Step B) Connect the Arduino UNO board to computer via USB cable,

Step C) Open the Arduino IDE and choose corresponding board type and port type for you project.

Step D)Download the sketch file from :

Unzip the download file and enter the folder esp8266-lesson3

Step E) Arduino IDE: Click file -> click Open -> choose code “esp8266-lesson2”, load up the sketch onto your Arduino.

In the sketch, find following lines:

char ssid[] = "******"; // your network SSID (name)
char pass[] = "******"; // your network password
please replace the ****** with your correct wifi SSID and password, otherwise your project 
can not connect to Internet.

Step F) Upload the sketch to your Arduino.

Open your Serial Monitor, you can see your router will assign an IP address to your Arduino as following:

In above example, is the IP address of my Arduino.
Now use another computer or your cell phone’s browser to visit url :
In your photoresistor sensor is exposure under light. Your browser will show following result:

Real time Photoresistor value: 545,47% of maximum sensor value.

1% means the environment is very dark.

Learn More about parts

No. Picture Product Name Link
1 OSOYOO basic board
2 OSOYOO WIFI shield
3 Photoresistor Sensor Module
4 Water Level Detection Sensor
5 Sound Detection Sensor Module
6 Ultrasonic sensor
7 Servo motor
8 Active Buzzer Module
9 Temperature&Humidity Sensor
10 Relay Module
11 Gas Sensor Module
12 Digital Barometric Pressure Sensor Module
13 Infrared Sensor Module
14 LED(6 x White, 6 x Red, 6 x Yellow, 6x Green)