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--- en:iot-open:practical:hardware:rtu:esp32:scenarios:bmp280 [2025/07/31 17:18] – created kivilands6
+++ en:iot-open:practical:hardware:rtu:esp32:scenarios:bmp280 [2025/07/31 17:18] (current) – [ESP32 BMP280] kivilands6
@@ Line 1: / Line 1: @@
+====== ESP32 BMP280 =====
+This is an example of the BMP280 reading and displaying on screen.
+===== Prequisits ====
+There is no necessary prequisits, the wire library will be pulled in automatically.
+===== Example ====
+<code>
+#include <Arduino.h>
+#include <Wire.h>
+#include <Adafruit_LiquidCrystal.h>
+#include <Adafruit_BMP280.h>
+/* BMP280 */
+Adafruit_BMP280 bmp; // I2C
+#define SDA_PIN 17
+#define SCL_PIN 16
+#define LCD_RS 48
+#define LCD_ENABLE 47
+#define LCD_D4 34
+#define LCD_D5 33
+#define LCD_D6 26
+#define LCD_D7 21
+static Adafruit_LiquidCrystal lcd(LCD_RS, LCD_ENABLE, LCD_D4, LCD_D5, LCD_D6, LCD_D7);
+void setup() {
+  Serial.begin(152000);
+  // Initialize I2C on custom pins
+  Wire.begin(SDA_PIN, SCL_PIN);
+  // Initialize LCD
+  if (!lcd.begin(16, 2)) {
+    Serial.println("Could not init LCD");
+    while (1);
+  }
+  Serial.println("LCD ready.");
+  lcd.print("IOT-OPEN");
+  // Initialize BMP280 with custom I2C (Wire) instance
+  if (!bmp.begin(0x76)) {
+    Serial.println(F("Could not find a valid BMP280 sensor, check wiring or address!"));
+    while (1) delay(10);
+  }
+  bmp.setSampling(Adafruit_BMP280::MODE_FORCED,
+                  Adafruit_BMP280::SAMPLING_X2,
+                  Adafruit_BMP280::SAMPLING_X16,
+                  Adafruit_BMP280::FILTER_X16,
+                  Adafruit_BMP280::STANDBY_MS_500);
+}
+void loop() {
+  float h = bmp.readPressure();
+  float t = bmp.readTemperature();
+  if (bmp.takeForcedMeasurement()) {
+    Serial.print(F("Temperature = "));
+    Serial.print(bmp.readTemperature());
+    Serial.println(" *C");
+    Serial.print(F("Pressure = "));
+    Serial.print(bmp.readPressure());
+    Serial.println(" Pa");
+    Serial.print(F("Approx altitude = "));
+    Serial.print(bmp.readAltitude(1013.25)); // Adjust to local forecast
+    Serial.println(" m");
+  }
+  lcd.setCursor(0, 0);
+  lcd.print("P: ");
+  lcd.print(h / 100.0); // Convert Pa to hPa
+  lcd.print("hPa");
+  lcd.setCursor(0, 1);
+  lcd.print("T: ");
+  lcd.print(t);
+  lcd.print("C");
+  delay(1000);
+}
+}
+</code>