Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Arduino Uno with ESP8622 - light on/off monitor and notify remote API end-point
/*
Photoresistor Part (Connection)
http://nakkaya.com/images/post/photoresistor.png
Connect the photoresistor one leg to pin 0, and pin to +5V
Connect a resistor (around 10k is a good value, higher
values gives higher readings) from pin 0 to GND.
----------------------------------------------------
PhotoR 10K
+5 o---/\/\/--.--/\/\/---o GND
|
Pin 0 o-----------
----------------------------------------------------
WiFi Part (Connection)
http://www.whatimade.today/content/images/2015/01/ESP8266_arduino_bb.jpg
*/
// CONFIGURATION START
#include <SoftwareSerial.h>
#define SSID "wifi_id"
#define PASSWORD "secret"
#define DST_IP "domain.com"
SoftwareSerial esp8266(10, 11);
int roomNumber=1;
// CONFIGURATION END
int lightPin=0; //define a pin for Photo resistor
int ledPin=13; //define a pin for LED
int resetPin=12; // connect D12 pin with reset
int brightSignalLimit=350; // define when photoresistor should change state
boolean lastOptoState = false;
boolean debug = true;
String string = "";
char ch;
void setup()
{
digitalWrite(resetPin, HIGH);
pinMode(resetPin, OUTPUT);
Serial.begin(9600); //Begin serial communication
esp8266.begin(9600);
Serial.println("App start...");
delay(5000);
Serial.println("Start in 5...");
delay(1000);
Serial.println("4...");
delay(1000);
Serial.println("3...");
delay(1000);
Serial.println("2...");
delay(1000);
Serial.println("1...");
delay(1000);
setupWiFi();
lastOptoState = optoState();
updateRemoteOptoState(lastOptoState);
}
void loop()
{
boolean currentOptoState = optoState();
if ( lastOptoState != currentOptoState )
{
lastOptoState = currentOptoState;
updateRemoteOptoState(lastOptoState);
}
analogWrite(ledPin, currentOptoState ? 0 : 150);
delay(1000);
}
boolean optoState()
{
//send the value to the ledPin. Depending on value of resistor
//you have to divide the value. for example,
//with a 10k resistor divide the value by 2, for 100k resistor divide by 4.
int analogOptoState = (analogRead(lightPin)/2);
Serial.println("Opto state");
Serial.println(analogOptoState);
if ( analogOptoState < brightSignalLimit )
{
return false;
}
return true;
}
void setupWiFi()
{
restartWiFi();
boolean connected=false;
while (!connected)
{
if(connectWiFi())
{
connected = true;
break;
}
}
delay(2000);
printer("AT+CIPMUX=0");
}
void restartWiFi()
{
while(!Serial);
while(!esp8266);
while(esp8266.available()>0)
{
esp8266.read();
}
esp8266.println("AT");
boolean reset = true;
while ( reset )
{
esp8266.flush();
esp8266.println("AT+RST");
if(esp8266.find("Ready")||esp8266.find("ready"))
{
Serial.println("Module is ready");
reset = false;
}
else
{
Serial.println(esp8266.read());
Serial.println("Module have no response.");
}
}
delay(1000);
}
void updateRemoteOptoState(boolean state)
{
String valueToSend = state ? "true " : "false";
long length = state ? 65 : 66;
String cmd = "AT+CIPSTART=\"TCP\",\"";
cmd += DST_IP;
cmd += "\",80";
esp8266.println(cmd);
Serial.println(cmd);
if(esp8266.find("Error")) return;
cmd = apiRequest(valueToSend);
String cip_cmp="AT+CIPSEND=";
cip_cmp+= length;
printer(cip_cmp);
while(!esp8266.find(">"))
{
Serial.println("No response...");
reset();
}
printer(cmd);
printer("host:domain.com");
printer("");
printer("");
delay(1500);
while (esp8266.available())
{
char c = esp8266.read();
Serial.write(c);
if(c=='\r') Serial.print('\n');
}
Serial.println("====");
}
String apiRequest(String valueToSend)
{
String cmd="GET /toxic.php?room=";
cmd+= roomNumber;
cmd+="&status=";
cmd+= valueToSend;
cmd+=" HTTP/1.0";
return cmd;
}
boolean connectWiFi()
{
esp8266.println("AT+CWMODE=1");
String cmd="AT+CWJAP=\"";
cmd+=SSID;
cmd+="\",\"";
cmd+=PASSWORD;
cmd+="\"";
printer(cmd);
delay(3000);
if(esp8266.find("OK"))
{
Serial.println("OK, Connected to WiFi.");
return true;
}
else
{
Serial.println("Can not connect to the WiFi.");
return false;
}
}
void reset()
{
Serial.println("Reset");
digitalWrite(resetPin, LOW);
}
void printer(String cmd)
{
Serial.println(cmd);
esp8266.println(cmd);
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.