This sketch is used to collect temperature data from a DS18S20 one-wire temperature sensor, an MQ5 hydrocarbon gas sensor and a humidity sensor. It queries these units whenever HCA tells it to and reports the data to HCA.<\/p>\n\n\n\n
#include <SPI.h>
#include <Ethernet.h>
#include <EthernetUdp.h>
#include <OneWire.h>
#include <stdlib.h><\/p>\n\n\n\n
\/\/ DS18S20 Temperature chip i\/o
OneWire ds(9); \/\/ on pin 9
String tempPacHead = “taddr:”;
String ds18addr = “”;
String tempPacket = “”;
String tempStr = “:”;
char fahr[10];<\/p>\n\n\n\n
\/\/ humidity variables
int humSensorPin = 0; \/\/ hum sensor goes to analog 0
int humSensorValue = 0;
char RH[10];
String humname = “ard70hum1”;
String humpacket = “”;<\/p>\n\n\n\n
\/\/ mq5 gas sensor vars
int mq5SensorPin = 1; \/\/ mq5 sensor goes to analog 1
int mq5SensorValue = 0;
String mq5name = “ard70mq51”;
String mq5packet = “”;<\/p>\n\n\n\n
\/\/ Enter a MAC address and IP address for your controller below.
\/\/ The IP address will be dependent on your local network:
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x70 };
IPAddress ip(192,168,0,70);
unsigned int Port_Remote = 5000; \/\/ remote port
IPAddress IP_Remote(192, 168, 0, 10); \/\/ IP address for smarthome
unsigned int localPort = 5001; \/\/ local port to listen on
char cmdGetData = ‘1’; \/\/ a “1” means read all the data
char cmdStatusCheck = ‘9’; \/\/ a “9” means smarthome is asking for status
char cmdIn = ‘0’; \/\/ used to obtain and compare buffer character
\/\/ can not use dig pins 2, 4, 10, 11, 12, 13
\/\/ An EthernetUDP instance to let us receive packets over UDP
EthernetUDP Udp;
char packetBuffer[UDP_TX_PACKET_MAX_SIZE]; \/\/buffer to hold incoming packet,<\/p>\n\n\n\n
void setup()
{
Serial.begin(9600);
delay(5000);
\/\/ start the Ethernet and UDP:
Ethernet.begin(mac,ip); \/\/ no need for gateway or mask
Udp.begin(localPort);
}<\/p>\n\n\n\n
void loop() {
\/\/ initialize variables
delay(10000);
byte i;
byte present = 0;
byte data[12];
byte addr[8];
float cent;
float tFahr;
float tRH;
String stringOne;<\/p>\n\n\n\n
\/\/ listen for incoming packets
int packetSize = Udp.parsePacket();
if(packetSize)
{
\/\/ Serial.print(“Received packet of size “);
\/\/ Serial.println(packetSize);
\/\/ Serial.print(“From “);
\/\/ IPAddress remote = Udp.remoteIP();
\/\/ for (int i =0; i < 4; i++)
\/\/ {
\/\/ Serial.print(remote[i], DEC);
\/\/ if (i < 3)
\/\/ {
\/\/ Serial.print(“.”);
\/\/ }
\/\/ }
\/\/
\/\/ Serial.print(“, port “);
\/\/ Serial.println(Udp.remotePort());<\/p>\n\n\n\n
\/\/ read the packet into packetBufffer
Udp.read(packetBuffer,1);
\/\/ Serial.print(“Contents:”);
\/\/ Serial.println(packetBuffer);
cmdIn = (packetBuffer[0]);
if (cmdIn == cmdGetData)
{
\/\/ gather data
\/\/ start of temp sensor code
while (ds.search(addr))
{
ds18addr = “”;
for( i = 0; i < 8; i++)
{
stringOne = String(addr[i], HEX);
if (stringOne.length() < 2){stringOne = “0” + stringOne; }
stringOne.toUpperCase();
ds18addr = ds18addr + stringOne;
}
if ( OneWire::crc8( addr, 7) == addr[7])
{
ds.reset();
ds.select(addr);
ds.write(0x44,1);
delay(1000);
present = ds.reset();
ds.select(addr);
ds.write(0xBE); \/\/ Read Scratchpad<\/p>\n\n\n\n
for ( i = 0; i < 9; i++) {data[i] = ds.read();}<\/p>\n\n\n\n
\/\/ calc temp value
cent = ( (data[1] << 8) + data[0] )*0.0625;
tFahr = (cent * 9 \/ 5) + 32;
dtostrf(tFahr,4,1,fahr);
tempPacket = tempPacHead + ds18addr + tempStr + fahr;
Udp.beginPacket(IP_Remote, Port_Remote);
Udp.print(tempPacket);
Udp.endPacket();
} \/\/ end of crc ok branch
} \/\/ end of while loop and temp sensor code<\/p>\n\n\n\n
\/\/ start of humidity sensor code
humSensorValue = analogRead(humSensorPin);
tRH = (humSensorValue – 225) \/ 6.38; \/\/ for HIH-4000
dtostrf(tRH,4,1,RH);
humpacket = humname + “=” + RH;
Udp.beginPacket(IP_Remote, Port_Remote);
Udp.print(humpacket);
Udp.endPacket();
\/\/ end of humidity sensor code<\/p>\n\n\n\n
\/\/ start of gas sensor code
mq5SensorValue = analogRead(mq5SensorPin);
mq5packet = mq5name + “=” + mq5SensorValue;
Udp.beginPacket(IP_Remote, Port_Remote);
Udp.print(mq5packet);
Udp.endPacket();
\/\/ end of gas sensor code<\/p>\n\n\n\n
} \/\/ end of cmdGetData = 0 section
\/\/ respond to status check
if (cmdIn == cmdStatusCheck)
\/\/ Serial.println(“matched9!”);
{
Udp.beginPacket(IP_Remote, Port_Remote);
Udp.write(“ard70ok=yes”); \/\/ send packet good status
Udp.endPacket();
} \/\/ end of status check
} \/\/ end of packet size section
}<\/p>\n","protected":false},"excerpt":{"rendered":"
This sketch is used to collect temperature data from a DS18S20 one-wire temperature sensor, an MQ5 hydrocarbon gas sensor and a humidity sensor. It queries these units whenever HCA tells it to and reports the data to HCA. #include <SPI.h>#include <Ethernet.h>#include <EthernetUdp.h>#include <OneWire.h>#include <stdlib.h> \/\/ DS18S20 Temperature chip i\/oOneWire ds(9); \/\/ on pin 9String tempPacHead … Continue reading Air Sensors Sketch<\/span>