Home automation, home control,smart or digital home are just diff erentnames for comfort, convenience, security andpower saving. Power saving systems are of increasingimportance nowadays. Even though such systems arevery expensive, rest assured that they can also be very cheap ifyou make them yourself. There are many ways to control a smart homesystem. One of them is over Ethernet.
All you need is a Atmega 32 microcontroller and an ENC28J60 serial Ethernet chip. This chip is a great solution for other microcontroller families as well such as PIC, dsPIC etc. The CviLux CJCBA8HF1Y0 RJ-45 connector is used for connection to the Ethernet network. An LED connected to the microcontroller PORTB. pin0 simulates a home appliance we want to control.
The mikroC PRO for AVR compiler contains the SPI_Ethernet library that will considerably simplify the process of writing a program for the microcontroller. By using a few routines from this library, it is possible to create the program that will enable electrical appliances in your home to be controlled via a web browser.
It is necessary to perform the following operations within the program:
Step 1. Create an html page to run the microcontroller through. Import it in the code as a string.
Step 2. Set IP, DNS, Gateway addresses and Subnet mask obtained from your internet provider.
For example, our local network parameters are as follows:
IP : 192.168.20.60 (Control System address)
DNS : 192.168.20.1 (Domain Name System address)
GATEWAY : 192.168.20.6 (Gateway address)
SUBNET : 255.255.255.0 (Subnet mask)
Step 3. Disable PORTA analogue inputs.The microcontroller pin should be cleared and confi gured as an output.
Step 4. Initialize the SPI module of the Atmega 32 microcontroller.
Step 5. Initialize the Serial Ethernet module chip ENC28J60.
Step 6. Write the code within the Spi_Ethernet_userTCP function that will, after receiving com mand via web browser, turn on/off the LED connected to the PORTA.0.
Step 7. Read received data in an endless loop.
The most important part of the program is the Spi_Ethernet_userTCP function, processing all received commands
After the web browser “GET” request is received, sent from your computer to the control system IP address, the microcontroller will respond with a web page stored in its memory. This page will then be automatically displayed on the computer screen by the browser.
When the ON command is received, the LED connected to the PORTA.0 will be turned on.
Likewise, when the OFF command is received the LED will be turned off . If you have a relay instead of LED, it is possible to control any appliance such as lighting, security system, heating system etc.
The control of any home appliance consists of entering control system IP address in the web browser and specifying the desired commands.
Of course, it is possible to control more than one microcontroller pin, which enables you to govern a large number of appliances or complete home automation system as well.
The screendump illustrates the web page displayed by the web browser after entering the control system IP address. In our example, ON and OFF button clicks cause the LED to be turned on and off, thus simulating the heating control system.
Below is a list of ready to use functions contained in the SPI Ethernet Library.This library is integrated in mikroC PRO for AVR compiler.
Program to demonstrate control over Ethernet:
// duplex confi g fl ags
#defi ne Spi_Ethernet_HALFDUPLEX 0x00 // half duplex
#defi ne Spi_Ethernet_FULLDUPLEX 0x01 // full duplex
// mE ehternet NIC pinout
sfr sbit SPI_Ethernet_Rst at PORTB.B0; // reset pin
sfr sbit SPI_Ethernet_CS at PORTB.B1; // chip select pin
sfr sbit SPI_Ethernet_Rst_Direction at DDRB.B0; // reset pin direction
sfr sbit SPI_Ethernet_CS_Direction at DDRB.B1; // chip select pin direction
// end ethernet NIC defi nitions
const char httpHeader[] = “HTTP/1.1 200 OK\nContent-type: “; // HTTP header
const char httpMimeTypeHTML[] = “text/html\n\n”; // HTML MIME type
const char httpMimeTypeScript[] = “text/plain\n\n”; // TEXT MIME type
// default html page
char indexPage[] =
“<html><head><title>mikroElektronika</title></head><body>\
<h3 align=center>MikroElektronika Home Automatization System</h3>\
<form name=\”input\” action=\”/\” method=\”get\”>\
<table align=center width=200 bgcolor=#4974E2 border=2><tr>\
<td align=center colspan=2><font size=4 color=white><b>Heat Control</b></font>\
</td></tr><tr><td align=center bgcolor=#4974E2><input name=\”tst1\” width=60 \
type=\”submit\” value=\”ON\”></td><td align=center bgcolor=#FFFF00>\
<input name=\”tst2\” type=\”submit\” value=\”OFF\”></td></tr></table>\
</form></body></html>”;
// network parameters
char myMacAddr[6] = {0x00, 0x14, 0xA5, 0x76, 0x19, 0x3f}; // my MAC address
char myIpAddr[4] = {192, 168, 20, 60}; // my IP address
char gwIpAddr[4] = {192, 168, 20, 6}; // gateway IP address
char dnsIpAddr[4] = {192, 168, 20, 1}; // dns IP address
char ipMask[4] = {255, 255, 255, 0}; // subnet mask
// end network parameters
unsigned char getRequest[20]; // HTTP request buff er
unsigned int SPI_Ethernet_UserTCP( char *remoteHost, unsigned int remotePort,
unsigned int localPort, unsigned int reqLength)
{
unsigned int len; // my reply length
if(localPort != 80) return(0); // I listen only to web request on port 80
// get 10 fi rst bytes only of the request, the rest does not matter here
for(len = 0 ; len < 15 ; len++) getRequest[len] = SPI_Ethernet_getByte();
getRequest[len] = 0;
if(memcmp(getRequest, “GET /”, 5)) return(0); // only GET method
if(!memcmp(getRequest+11, “ON”, 2)) // do we have ON command
PORTA.F0 = 1; // set PORTA bit0
else
if(!memcmp(getRequest+11, “OFF”, 3)) // do we have OFF command
PORTA.F0 = 0; // clear PORTA bit0
if (PORTA.F0)
{
memcpy(indexPage+340, “#FFFF00”, 6); // highlight (yellow) ON
memcpy(indexPage+431, “#4974E2”, 6); // clear OFF
}
else
{
memcpy(indexPage+340, “#4974E2”, 6); // clear ON
memcpy(indexPage+431, “#FFFF00”, 6); // highlight (yellow) OFF
}
len = SPI_Ethernet_putConstString(httpHeader); // HTTP header
len += SPI_Ethernet_putConstString(httpMimeTypeHTML); // with HTML MIME type
len += SPI_Ethernet_putString(indexPage); // HTML page fi rst part
return len; // return to the library with the number of bytes to transmit
}
unsigned int SPI_Ethernet_UserUDP( char *remoteHost, unsigned int remotePort,
unsigned int destPort, unsigned int reqLength)
{
return 0; // back to the library with the length of the UDP reply
}
void main()
{
// set PORTA as output
PORTA0_bit = 0; // clear PORTA.B0
DDRA.F0 = 1; // set PORTA.B0 as output (rele control pin)
// starts ENC28J60 with: reset bit on PORTB.F0, CS bit on PORTB.F1,
// my MAC & IP address, full duplex
SPI1_Init_Advanced(_SPI_MASTER, _SPI_FCY_DIV4, _SPI_CLK_LO_LEADING);
Spi_Rd_Ptr = SPI1_Read; // pass SPI Read function of used SPI module
// full duplex, CRC + MAC Unicast + MAC Broadcast fi ltering
SPI_Ethernet_Init(myMacAddr, myIpAddr, Spi_Ethernet_FULLDUPLEX);
// dhcp will not be used here, so use preconfi gured addresses
SPI_Ethernet_confNetwork(ipMask, gwIpAddr, dnsIpAddr);
while(1) { // do forever
SPI_Ethernet_doPacket(); // process incoming Ethernet packets
}
}
Source: http://www.mikroe.com
All you need is a Atmega 32 microcontroller and an ENC28J60 serial Ethernet chip. This chip is a great solution for other microcontroller families as well such as PIC, dsPIC etc. The CviLux CJCBA8HF1Y0 RJ-45 connector is used for connection to the Ethernet network. An LED connected to the microcontroller PORTB. pin0 simulates a home appliance we want to control.
The mikroC PRO for AVR compiler contains the SPI_Ethernet library that will considerably simplify the process of writing a program for the microcontroller. By using a few routines from this library, it is possible to create the program that will enable electrical appliances in your home to be controlled via a web browser.
It is necessary to perform the following operations within the program:
Step 1. Create an html page to run the microcontroller through. Import it in the code as a string.
Step 2. Set IP, DNS, Gateway addresses and Subnet mask obtained from your internet provider.
For example, our local network parameters are as follows:
IP : 192.168.20.60 (Control System address)
DNS : 192.168.20.1 (Domain Name System address)
GATEWAY : 192.168.20.6 (Gateway address)
SUBNET : 255.255.255.0 (Subnet mask)
Step 3. Disable PORTA analogue inputs.The microcontroller pin should be cleared and confi gured as an output.
Step 4. Initialize the SPI module of the Atmega 32 microcontroller.
Step 5. Initialize the Serial Ethernet module chip ENC28J60.
Step 6. Write the code within the Spi_Ethernet_userTCP function that will, after receiving com mand via web browser, turn on/off the LED connected to the PORTA.0.
Step 7. Read received data in an endless loop.
The most important part of the program is the Spi_Ethernet_userTCP function, processing all received commands
After the web browser “GET” request is received, sent from your computer to the control system IP address, the microcontroller will respond with a web page stored in its memory. This page will then be automatically displayed on the computer screen by the browser.
When the ON command is received, the LED connected to the PORTA.0 will be turned on.
Likewise, when the OFF command is received the LED will be turned off . If you have a relay instead of LED, it is possible to control any appliance such as lighting, security system, heating system etc.
The control of any home appliance consists of entering control system IP address in the web browser and specifying the desired commands.
Of course, it is possible to control more than one microcontroller pin, which enables you to govern a large number of appliances or complete home automation system as well.
The screendump illustrates the web page displayed by the web browser after entering the control system IP address. In our example, ON and OFF button clicks cause the LED to be turned on and off, thus simulating the heating control system.
Below is a list of ready to use functions contained in the SPI Ethernet Library.This library is integrated in mikroC PRO for AVR compiler.
Program to demonstrate control over Ethernet:
// duplex confi g fl ags
#defi ne Spi_Ethernet_HALFDUPLEX 0x00 // half duplex
#defi ne Spi_Ethernet_FULLDUPLEX 0x01 // full duplex
// mE ehternet NIC pinout
sfr sbit SPI_Ethernet_Rst at PORTB.B0; // reset pin
sfr sbit SPI_Ethernet_CS at PORTB.B1; // chip select pin
sfr sbit SPI_Ethernet_Rst_Direction at DDRB.B0; // reset pin direction
sfr sbit SPI_Ethernet_CS_Direction at DDRB.B1; // chip select pin direction
// end ethernet NIC defi nitions
const char httpHeader[] = “HTTP/1.1 200 OK\nContent-type: “; // HTTP header
const char httpMimeTypeHTML[] = “text/html\n\n”; // HTML MIME type
const char httpMimeTypeScript[] = “text/plain\n\n”; // TEXT MIME type
// default html page
char indexPage[] =
“<html><head><title>mikroElektronika</title></head><body>\
<h3 align=center>MikroElektronika Home Automatization System</h3>\
<form name=\”input\” action=\”/\” method=\”get\”>\
<table align=center width=200 bgcolor=#4974E2 border=2><tr>\
<td align=center colspan=2><font size=4 color=white><b>Heat Control</b></font>\
</td></tr><tr><td align=center bgcolor=#4974E2><input name=\”tst1\” width=60 \
type=\”submit\” value=\”ON\”></td><td align=center bgcolor=#FFFF00>\
<input name=\”tst2\” type=\”submit\” value=\”OFF\”></td></tr></table>\
</form></body></html>”;
// network parameters
char myMacAddr[6] = {0x00, 0x14, 0xA5, 0x76, 0x19, 0x3f}; // my MAC address
char myIpAddr[4] = {192, 168, 20, 60}; // my IP address
char gwIpAddr[4] = {192, 168, 20, 6}; // gateway IP address
char dnsIpAddr[4] = {192, 168, 20, 1}; // dns IP address
char ipMask[4] = {255, 255, 255, 0}; // subnet mask
// end network parameters
unsigned char getRequest[20]; // HTTP request buff er
unsigned int SPI_Ethernet_UserTCP( char *remoteHost, unsigned int remotePort,
unsigned int localPort, unsigned int reqLength)
{
unsigned int len; // my reply length
if(localPort != 80) return(0); // I listen only to web request on port 80
// get 10 fi rst bytes only of the request, the rest does not matter here
for(len = 0 ; len < 15 ; len++) getRequest[len] = SPI_Ethernet_getByte();
getRequest[len] = 0;
if(memcmp(getRequest, “GET /”, 5)) return(0); // only GET method
if(!memcmp(getRequest+11, “ON”, 2)) // do we have ON command
PORTA.F0 = 1; // set PORTA bit0
else
if(!memcmp(getRequest+11, “OFF”, 3)) // do we have OFF command
PORTA.F0 = 0; // clear PORTA bit0
if (PORTA.F0)
{
memcpy(indexPage+340, “#FFFF00”, 6); // highlight (yellow) ON
memcpy(indexPage+431, “#4974E2”, 6); // clear OFF
}
else
{
memcpy(indexPage+340, “#4974E2”, 6); // clear ON
memcpy(indexPage+431, “#FFFF00”, 6); // highlight (yellow) OFF
}
len = SPI_Ethernet_putConstString(httpHeader); // HTTP header
len += SPI_Ethernet_putConstString(httpMimeTypeHTML); // with HTML MIME type
len += SPI_Ethernet_putString(indexPage); // HTML page fi rst part
return len; // return to the library with the number of bytes to transmit
}
unsigned int SPI_Ethernet_UserUDP( char *remoteHost, unsigned int remotePort,
unsigned int destPort, unsigned int reqLength)
{
return 0; // back to the library with the length of the UDP reply
}
void main()
{
// set PORTA as output
PORTA0_bit = 0; // clear PORTA.B0
DDRA.F0 = 1; // set PORTA.B0 as output (rele control pin)
// starts ENC28J60 with: reset bit on PORTB.F0, CS bit on PORTB.F1,
// my MAC & IP address, full duplex
SPI1_Init_Advanced(_SPI_MASTER, _SPI_FCY_DIV4, _SPI_CLK_LO_LEADING);
Spi_Rd_Ptr = SPI1_Read; // pass SPI Read function of used SPI module
// full duplex, CRC + MAC Unicast + MAC Broadcast fi ltering
SPI_Ethernet_Init(myMacAddr, myIpAddr, Spi_Ethernet_FULLDUPLEX);
// dhcp will not be used here, so use preconfi gured addresses
SPI_Ethernet_confNetwork(ipMask, gwIpAddr, dnsIpAddr);
while(1) { // do forever
SPI_Ethernet_doPacket(); // process incoming Ethernet packets
}
}
Source: http://www.mikroe.com
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