Internet Of Things : HTTP SERVER ON PI.

Accessing wifi in Arduino

open the serial monitor and enter the code given down below.

Code:

#include <ESP8266WiFi.h>
	const char ssid = "aneesh";*
	const char password = "raspberry";*
	const char host = "www.google.com";*
	void setup() {
	Serial.begin(115200);
	delay(100);
	// We start by connecting to a WiFi network
	Serial.println();
	Serial.println();
	Serial.print("Connecting to ");
	Serial.println(ssid);
	WiFi.begin(ssid, password);
	while (WiFi.status() != WL_CONNECTED) {
	delay(500);

	Serial.print(".");
	}
	Serial.println("");
	Serial.println("WiFi connected");
	Serial.println("IP address: ");
	Serial.println(WiFi.localIP());
	}
	int value = 0;
	void loop() {

	}

Arduino on PI

The first step is to load the Arduino environment to PI, by using the following commands

sudo apt–get update

sudo apt–get dist–upgrade

Next, Install Arduino IDE with,

sudo apt–get install Arduino (Click Y to add any dependencies)

To disable the serial login (for Raspberry- Pi 3),

sudo systemctl stop serial–getty@ttyS0.service

sudo systemctl disable serial–getty@ttyS0.service

The next step is to disable the boot info, for this we need to edit the /boot/cmdline.txt file by deleting the “console=serail0,115200″ as shown.

dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p6 rootfstype=ext4 elevator=deadline rootwait

To link the serial port to the Arduino IDE, we create a permanent link that maps AMA0 to S0.

Now create a file by “ sudo nano"

Enter the following code in the newly created file

KERNEL==“ttyAMA0”, SYMLINK+=“ttyS0”,GROUP=“dialout”,MODE:=0666
KERNEL==“ttyACM0”, SYMLINK+=“ttyS1”,GROUP=“dialout”,MODE:=0666

and save it to: /etc/udev/rules.d/

And then to link the new avrdude-autoreset to avrdude so that the new version runs instead.

sudo ln –s /usr/bin/avrdude–autoreset /usr/bin/avrdude

Adding the sleepy Pi to the Arduino environment, to run the Arduino environment we need to create the sketchbook folder and then “hardware” & “Sleepy_pi ” in sketchbook.

mkdir /home/pi/sketchbook
mkdir /home/pi/sketchbook/hardware
mkdir /home/pi/sketchbook/hardware/Sleepy_pi

Now create another file “boards.txt” in Sleepy_pi folder and the file contains the following code,

sleepypi.name=Sleepy Pi

sleepypi.upload.protocol=arduino

sleepypi.upload.maximum_size=30720

sleepypi.upload.speed=57600

sleepypi.bootloader.low_fuses=0xFF

sleepypi.bootloader.high_fuses=0xDA

sleepypi.bootloader.extended_fuses=0x05

sleepypi.bootloader.path=arduino:atmega

sleepypi.bootloader.file=ATmegaBOOT_168_atmega328_pro_8MHz.hex

sleepypi.bootloader.unlock_bits=0x3F

sleepypi.bootloader.lock_bits=0x0F

sleepypi.build.mcu=atmega328p

sleepypi.build.f_cpu=8000000L

sleepypi.build.core=arduino:arduino

sleepypi.build.variant=arduino:standard

8. As a final step, Reboot the Pi to complete and load all changes.

sudo reboot

HTTP Server on PI

HTTP Webserver on Pi to host a full website or to display some information to other machines on our network. There are various web server that are available with different advantages and usage. Among them, I choose Apache, which is a popular web server application and install it on Pi.

Install Apache2 package by ” sudo apt–get install apache2 –y”
To Test the webserver,
We have a test HTML file in Apache folder, so when we type our Pi’s IP address (like http://198.162.10.22) we will get a default web page as shown in the following figure.