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Arduino sketch for ESP-01 + OLED + BME280
#include <stdio.h>
#include <Wire.h>
#include <ESP8266WiFi.h>
#include <BME280.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
// WiFi configuration
const char* ssid = "WIFI_SSID";
const char* password = "WIFIT_PASSWORD";
// IFTTT Maker channel setting
const char* host = "maker.ifttt.com";
const char* url = "/trigger/EVENT_NAME/with/key/REPLACE_THIS_WITH_KEY";
uint32_t timeoutCounterMsec = 0;
const uint32_t TIMEOUT_COUNTER_MSEC = 10e3;
const uint32_t TIMEOUT_DURATION_MSEC = 1000;
// Global variables
bool wifiConnected = false;
bool iftttTriggerSucceeded = false;
char strBuffer[128];
// Global instances
BME280 bme280;
Adafruit_SSD1306 display;
WiFiClient client;
struct BME280Data {
// Temperature degC
double t;
// Pressure hPa
double p;
// Humidity %
double h;
};
BME280Data bme280Data;
void setup() {
Serial.begin(115200);
delay(10);
initializeI2CDevices();
clearDisplay();
connectToWiFi();
readBME280Data();
if (wifiConnected) {
triggerIFTTT();
}
displayBME280Data();
}
void initializeI2CDevices() {
// Initialize I2C pins
// SDA = GPIO0
// SCL = GPIO2
Wire.begin(0, 2);
// Initialize BME280
bme280.setMode(BME280_MODE_NORMAL, BME280_TSB_1000MS, BME280_OSRS_x1, BME280_OSRS_x1, BME280_OSRS_x1, BME280_FILTER_OFF);
// Initialize OLED Display
display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
}
void clearDisplay() {
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(0, 0);
display.println("EPS01 + OLED + BME280");
display.println("");
display.display();
}
void readBME280Data() {
bme280.getData(
&bme280Data.t,
&bme280Data.h,
&bme280Data.p);
}
// Provide sufficiently large buffer
void doubleToStr(double value, char* buffer) {
sprintf(buffer, "%d.%1d", (uint32_t)value, (uint32_t)(value * 10) % 10);
}
void displayBME280Data() {
clearDisplay();
doubleToStr(bme280Data.t, strBuffer);
display.printf("WiFi : %s\n", (wifiConnected? "Connected":"Disconnected"));
display.printf("IFTTT: %s\n", (iftttTriggerSucceeded? "Triggered":"Not triggered"));
display.printf("T = %s degC\n", strBuffer);
doubleToStr(bme280Data.p, strBuffer);
display.printf("P = %s hPa\n", strBuffer);
doubleToStr(bme280Data.h, strBuffer);
display.printf("H = %s %%\n", strBuffer);
display.display();
}
void connectToWiFi() {
display.println("Connecting to WiFi");
display.print("SSID: ");
display.println(ssid);
display.display();
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(TIMEOUT_DURATION_MSEC);
display.print(".");
display.display();
if (timeoutCounterMsec >= TIMEOUT_COUNTER_MSEC) {
timeoutCounterMsec += TIMEOUT_DURATION_MSEC;
break;
}
}
display.println();
// If connected, execute HTTP POST
if (WiFi.status() == WL_CONNECTED) {
display.println("Connected");
display.print("IP: ");
display.println(WiFi.localIP());
display.display();
wifiConnected = true;
} else {
// WiFi connection timeout
display.println("Timed out");
display.display();
delay(2000);
}
}
void enterDeepSleep() {
// Sleep (10s)
Serial.println("Entering deep sleep :)");
ESP.deepSleep(0);
delay(500);
}
void triggerIFTTT() {
Serial.print("Connecting to ");
Serial.println(host);
// Use WiFiClient class to create TCP connections
const int httpPort = 80;
if (!client.connect(host, httpPort)) {
Serial.println("Connection failed");
return;
}
// We now create a URI for the request
Serial.print("Requesting URL: ");
Serial.println(url);
String json = "{";
doubleToStr(bme280Data.t, strBuffer);
json += "\"value1\":\"" + String(strBuffer) + "\",";
doubleToStr(bme280Data.p, strBuffer);
json += "\"value2\":\"" + String(strBuffer) + "\",";
doubleToStr(bme280Data.h, strBuffer);
json += "\"value3\":\"" + String(strBuffer) + "\"}";
// This will send the request to the server
clearDisplay();
display.println("Triggering IFTTT...");
display.display();
client.println(String("POST ") + url + " HTTP/1.1");
client.println(String("Host: ") + host);
client.println("Cache-Control: no-cache");
client.println("Content-Type: application/JSON");
client.print("Content-Length: ");
client.println(json.length());
client.println();
client.println(json);
delay(1000);
// Read all the lines of the reply from server and print them to Serial
while (client.available()) {
String line = client.readStringUntil('\r');
display.print(line);
display.display();
if(line.indexOf("OK")>=0 && line.indexOf("HTTP")>=0){
iftttTriggerSucceeded = true;
}
}
Serial.println();
Serial.println("Closing connection");
delay(1000);
clearDisplay();
}
void loop() {
display.display();
// Wait 10sec
delay(10000);
// Clear display
display.clearDisplay();
display.display();
display.ssd1306_command(SSD1306_DISPLAYOFF);
// Enter deep sleep
enterDeepSleep();
}
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