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wireless soil humidity, temperature and light measurement with esp8266. more info at http://psychip.net/entry/indoor-gardening-ep2-monitoring-vitals-with-esp8266
#include <SoftwareSerial.h>
#include <OneWire.h>
const String uniqid = "180316-003";
const String serveraddr = "192.168.1.21";
const String serverport = "3535";
const String ssid = "your_ssid_here";
const String password = "your_ssid_pass";
int TMP = 13;
int LDR = A1;
int SOL = A0;
unsigned long lastreading = 0;
const int readinterval = 9000;
const int pumpinterval = 3000;
const int serdelay = 250;
OneWire ds(TMP);
SoftwareSerial esp(2,3); // RX, TX
int light,soil;
float tempraw;
unsigned long l1,latency;
void setup(void) {
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
esp.begin(9600);
while (!esp) {
; // wait for serial port to connect. Needed for native USB port only
}
delay(1000);
esp.print("AT+RST\r\n");
delay(6000);
esp.print("AT+CIPMUX=0\r\n");
delay(250);
esp.print("AT+CWJAP=\""+ssid+"\",\""+password+"\""+"\r\n");
delay(8000);
}
void pumpdata() {
if((millis()-lastreading)>readinterval) {
analogRead(LDR);
light = analogRead(LDR);
delay(100);
analogRead(SOL);
soil = analogRead(SOL);
lastreading=millis();
delay(100);
tempraw=getTemp();
lastreading=millis();
}
char buffer[10];
String tem = dtostrf(tempraw, 5, 2, buffer);
String temper = (tem);
float thrmraw;
thrmraw=readThrm();
char buffer2[10];
String thm = dtostrf(thrmraw, 5, 2, buffer2);
String thermal = (thm);
String querystr = "/c/pushdata/";
querystr += "id="+uniqid+"|";
querystr += "uptime="+String(millis(), DEC)+"|";
querystr += "light="+String(light, DEC)+"|";
querystr += "temp="+temper+"|";
querystr += "soil="+String((1023-soil), DEC)+"|";
querystr += "vcc="+String(readVcc(), DEC)+"|";
querystr += "thrm="+thermal+"|";
querystr += "latc="+String(latency, DEC);
httpGet(serveraddr,serverport,querystr);
}
void loop(void) {
l1=millis();
pumpdata();
latency=millis()-l1;
delay(pumpinterval);
}
void httpGet(String host,String port,String request) {
String hdata = "GET "+request;
hdata += " HTTP/1.1\r\n";
hdata += "Host: "+host+"\r\n";
hdata += "Connection: close\r\n";
hdata += "\r\n";
String cipSend = "AT+CIPSEND=";
cipSend +=hdata.length();
cipSend +="\r\n";
esp.print("AT+CIPSTART=\"TCP\",\""+host+"\","+port+"\r\n");
delay(serdelay);
esp.print(cipSend);
delay(serdelay);
esp.print(hdata);
delay(serdelay);
esp.print("AT+CIPCLOSE\r\n");
delay(serdelay);
}
double readThrm(void) {
unsigned int wADC;
double t;
ADMUX = (_BV(REFS1) | _BV(REFS0) | _BV(MUX3));
delay(8);
ADCSRA |= _BV(ADEN); // enable the ADC
ADCSRA |= _BV(ADSC); // Start the ADC
while (bit_is_set(ADCSRA,ADSC));
wADC = ADCW;
t = (wADC - 324.31 ) / 1.22;
return (t);
}
long readVcc() {
long result;
ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
delay(2);
ADCSRA |= _BV(ADSC);
while (bit_is_set(ADCSRA,ADSC));
result = ADCL;
result |= ADCH<<8;
result = 1126400L / result;
return result;
}
float getTemp(){
byte data[12];
byte addr[8];
if (!ds.search(addr)) {
ds.reset_search();
return -1000;
}
if ( OneWire::crc8( addr, 7) != addr[7]) {
// Serial.println("CRC is not valid!");
return -1000;
}
if ( addr[0] != 0x10 && addr[0] != 0x28) {
// Serial.print("Device is not recognized");
return -1000;
}
ds.reset();
ds.select(addr);
ds.write(0x44,1); // start conversion, with parasite power on at the end
byte present = ds.reset();
ds.select(addr);
ds.write(0xBE); // Read Scratchpad
for (int i = 0; i < 9; i++) { // we need 9 bytes
data[i] = ds.read();
}
ds.reset_search();
byte MSB = data[1];
byte LSB = data[0];
float tempRead = ((MSB << 8) | LSB); //using two's compliment
float TemperatureSum = tempRead / 16;
return TemperatureSum;
}
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