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@xxlukas42
Last active Sep 28, 2020
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#include <SPI.h>
#include <ESP8266WiFi.h>
#include <Wire.h>
#include <SFE_MicroOLED.h>
#define PIN_RESET 255 //
#define DC_JUMPER 0 // I2C Addres: 0 - 0x3C, 1 - 0x3D
MicroOLED oled(PIN_RESET, DC_JUMPER);
// Wifi and ThingSpeak settings
const char* ssid = "YourSSID";
char* password = "YourPassword";
const char* server = "api.thingspeak.com";
const char* api_key = "YourApiKey";
// Measurement interval (seconds)
const int sleepTimeS = 10; // 10 secs
#define LED D4
int moisture, light, i;
WiFiClient client;
void printFormattedFloat(float x, uint8_t precision) {
char buffer[10];
dtostrf(x, 7, precision, buffer);
Serial.print(buffer);
}
void postChirp(int moisture, int light){
if (client.connect(server,80)) {
Serial.println("Connect to ThingSpeak - OK");
String dataToThingSpeak = "";
dataToThingSpeak+="GET /update?api_key=";
dataToThingSpeak+=api_key;
dataToThingSpeak+="&field1=";
dataToThingSpeak+=String(moisture);
dataToThingSpeak+="&field2=";
dataToThingSpeak+=String(light);
dataToThingSpeak+=" HTTP/1.1\r\nHost: a.c.d\r\nConnection: close\r\n\r\n";
dataToThingSpeak+="";
client.print(dataToThingSpeak);
int timeout = millis() + 5000;
while (client.available() == 0) {
if (timeout - millis() < 0) {
Serial.println("Error: Client Timeout!");
client.stop();
return;
}
}
}
}
void writeI2CRegister8bit(int addr, int value) {
Wire.beginTransmission(addr);
Wire.write(value);
Wire.endTransmission();
}
unsigned int readI2CRegister16bit(int addr, int reg) {
Wire.beginTransmission(addr);
Wire.write(reg);
Wire.endTransmission();
delay(1100);
Wire.requestFrom(addr, 2);
unsigned int t = Wire.read() << 8;
t = t | Wire.read();
return t;
}
// Setup wire and serial
void setup(){
Wire.begin();
Serial.begin(9600);
pinMode(LED, OUTPUT);
delay(10);
oled.begin();
oled.clear(PAGE);
oled.clear(ALL);
oled.setCursor(0, 0);
oled.print("WLAN: ");
oled.display();
Serial.println("Connecting to wifi...");
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED){
// Blink LED when connecting to wifi
digitalWrite(LED, LOW);
oled.setCursor(30, 0);
oled.print("ASSOC");
oled.display();
delay(250);
digitalWrite(LED, HIGH);
oled.setCursor(30, 0);
oled.print(" ");
oled.display();
delay(250);
}
oled.setCursor(30, 0);
oled.print(" ");
oled.setCursor(30, 0);
oled.print("OK");
oled.display();
Serial.println("WiFi connected");
oled.display();
oled.setCursor(0, 10);
oled.print("SWITCH NOW");
oled.display();
while(i < 10){
writeI2CRegister8bit(0x20, 3);
light = readI2CRegister16bit(0x20, 4);
oled.setCursor(0, 20);
oled.print(light);
oled.display();
i++;
delay(100);
}
oled.clear(PAGE);
oled.clear(ALL);
}
// main loop
void loop(){
Serial.print("Moisture: ");
moisture = readI2CRegister16bit(0x20, 0);
Serial.println(moisture); //read capacitance register
writeI2CRegister8bit(0x20, 3); //request light measurement
delay(10000); //this can take a while
Serial.print("Light: ");
light = readI2CRegister16bit(0x20, 4);
Serial.println(light); //read light register
Serial.println("=============");
oled.clear(PAGE);
oled.clear(ALL);
oled.setCursor(0, 10);
oled.print("MOI: ");
oled.print(moisture);
oled.setCursor(0, 20);
oled.print("LUM: ");
oled.print(light);
oled.display();
delay(38900);
postChirp(moisture, light);
}
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