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• • Objective
  • Parts and Devices
  • How to make
  • How to code
  • How to play
  • Result

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:

• • • • The Photoresistor uses analog output, so you will need to use the analog pins on the Arduino.
      • In this example, we are using a 5v power supply from the Arduino, but we could use the 3.3v as well.
      • The provided diagram is just an example of how to connect the hardware. There are many ways to connect devices, so try what works best for you!

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

Download Arduino IDE from https://www.arduino.cc/en/Main/Software?setlang=en, 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.

• • • Board:”Arduino/Genuino UNO”
    • Port: Choose your own Serial Port for your UNO board .

Step D)Download the sketch file from : https://osoyoo.com/driver/wifi-iot/lesson3/esp8266-lesson3.zip

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, 192.168.50.9 is the IP address of my Arduino.
Now use another computer or your cell phone’s browser to visit url : http://192.168.50.9
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	https://osoyoo.store/products/osoyoo-uno-r3-for-arduino?variant=31955265290351
2		OSOYOO WIFI shield	https://osoyoo.store/products/esp8266-wifi-shiled-osoyoo-wifi-internet-of-things-learning-kit-for-arduino-uno?variant=31955252215919
3		Photoresistor Sensor Module	https://osoyoo.store/products/photoresistor-sensor-module-light-detection-digital-switch-mete-for-arduino?variant=31955271057519
4		Water Level Detection Sensor	https://osoyoo.store/products/rain-water-level-sensor-module-detection-liquid-surface-depth-height-for-arduino?variant=31955273810031
5		Sound Detection Sensor Module	https://osoyoo.store/products/high-sensitivity-sound-microphone-sensor-detection-module-for-arduino-avr-pic?variant=31955278921839
6		Ultrasonic sensor	https://osoyoo.store/products/hc-sr04-ultrasonic-sensor-module-for-arduino?variant=31957815558255
7		Servo motor	https://osoyoo.store/products/sg90-micro-servo-for-arduino-raspberry-pi-robot?variant=31957821096047
8		Active Buzzer Module	https://osoyoo.store/products/buzzer-sensor-module-for-esp8266-iot-kit?variant=31955947225199
9		Temperature&Humidity Sensor	https://osoyoo.store/products/dht11-temperature-humidity-sensor-module-for-arduino?variant=31955953221743
10		Relay Module	https://osoyoo.store/products/single-channel-relay-module-for-arduino-raspberry-pi?variant=31955954401391
11		Gas Sensor Module	https://osoyoo.store/products/mq-2-smoke-sensor-for-arduino?variant=31955955417199
12		Digital Barometric Pressure Sensor Module	https://osoyoo.store/products/bmp180-high-precision-pressure-sensor-for-arduino?variant=31957739339887
13		Infrared Sensor Module	https://osoyoo.store/products/hc-sr501-pir-motion-sensor-for-arduino?variant=31957812838511
14		LED(6 x White, 6 x Red, 6 x Yellow, 6x Green)	https://osoyoo.store/products/led-packs-for-arduino?variant=31957816442991