AHT20+BMP280 Digital Temperature, Humidity and Pressure Sensor Module
It's a module adopts the digital temperature and humidity sensor AHT20 and Bosch BPM280 composed of Aosong, I2C mainstream output,
Connection:
To install SSD1306 library on Arduino IDE, refer to the post "Seeeduino XIAO display on OLED screen (with ssd1306 using I2C interface)".
For AHT20+BMP280, AHTX0 and BMP280 libraries by Adafruit will be used, both them can be installed in Arduino IDE Library Manager.
AHT20 Testing:
#include "ssd1306.h"
#include <Adafruit_AHTX0.h>
Adafruit_AHTX0 aht;
void setup() {
Serial.begin(9600);
Serial.println("AHT20 test");
if (! aht.begin()) {
Serial.println("Could not find AHT? Check wiring");
while (1) delay(10);
}
Serial.println("AHT10 or AHT20 found");
ssd1306_setFixedFont(ssd1306xled_font6x8);
ssd1306_128x64_i2c_init();
ssd1306_clearScreen();
ssd1306_printFixed(0, 8, "arduino-er exercise", STYLE_NORMAL);
ssd1306_printFixed(0, 16, "XIAO/ssd1306", STYLE_BOLD);
ssd1306_printFixed(0, 24, "AHT20 test", STYLE_ITALIC);
ssd1306_positiveMode();
delay(2000);
ssd1306_clearScreen();
}
void loop() {
sensors_event_t humidity, temp;
aht.getEvent(&humidity, &temp);// populate temp and humidity objects with fresh data
Serial.print("Temperature: ");
Serial.print(temp.temperature);
Serial.println(" degrees C");
ssd1306_printFixed(0, 10, "- AHT20 -", STYLE_BOLD);
char charTemp[32];
dtostrf(temp.temperature, 8, 2, charTemp);
ssd1306_printFixed(0, 28, "Temperature (C):", STYLE_NORMAL);
ssd1306_printFixed(80, 36, charTemp, STYLE_NORMAL);
Serial.print("Humidity: ");
Serial.print(humidity.relative_humidity);
Serial.println("% rH");
char charHumi[32];
dtostrf(humidity.relative_humidity, 8, 2, charHumi);
ssd1306_printFixed(0, 44, "Humidity (% rH):", STYLE_NORMAL);
ssd1306_printFixed(80, 52, charHumi, STYLE_NORMAL);
delay(500);
}
BMP280 Testing:
#include "ssd1306.h"
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_BMP280.h>
#define BMP_SCK (13)
#define BMP_MISO (12)
#define BMP_MOSI (11)
#define BMP_CS (10)
Adafruit_BMP280 bmp; // I2C
//Adafruit_BMP280 bmp(BMP_CS); // hardware SPI
//Adafruit_BMP280 bmp(BMP_CS, BMP_MOSI, BMP_MISO, BMP_SCK);
void setup() {
if (!bmp.begin()) {
Serial.println(F("Could not find a valid BMP280 sensor, check wiring!"));
while (1);
}
Serial.println("BMP280 found");
/* Default settings from datasheet. */
bmp.setSampling(Adafruit_BMP280::MODE_NORMAL, /* Operating Mode. */
Adafruit_BMP280::SAMPLING_X2, /* Temp. oversampling */
Adafruit_BMP280::SAMPLING_X16, /* Pressure oversampling */
Adafruit_BMP280::FILTER_X16, /* Filtering. */
Adafruit_BMP280::STANDBY_MS_500); /* Standby time. */
ssd1306_setFixedFont(ssd1306xled_font6x8);
ssd1306_128x64_i2c_init();
ssd1306_clearScreen();
ssd1306_printFixed(0, 8, "arduino-er exercise", STYLE_NORMAL);
ssd1306_printFixed(0, 16, "XIAO/ssd1306", STYLE_BOLD);
ssd1306_printFixed(0, 24, "BMP280 test", STYLE_ITALIC);
ssd1306_positiveMode();
delay(2000);
ssd1306_clearScreen();
}
void loop() {
ssd1306_printFixed(0, 8, "- BMP280 -", STYLE_BOLD);
Serial.print(F("Temperature = "));
Serial.print(bmp.readTemperature());
Serial.println(" *C");
char charTemp[32];
dtostrf(bmp.readTemperature(), 8, 2, charTemp);
ssd1306_printFixed(0, 16, "Temperature (C):", STYLE_NORMAL);
ssd1306_printFixed(60, 24, charTemp, STYLE_NORMAL);
Serial.print(F("Pressure = "));
Serial.print(bmp.readPressure());
Serial.println(" Pa");
char charPres[32];
dtostrf(bmp.readPressure(), 8, 2, charPres);
ssd1306_printFixed(0, 32, "Pressure (Pa):", STYLE_NORMAL);
ssd1306_printFixed(60, 40, charPres, STYLE_NORMAL);
Serial.print(F("Approx altitude = "));
Serial.print(bmp.readAltitude(1013.25)); /* Adjusted to local forecast! */
Serial.println(" m");
char charAlti[32];
dtostrf(bmp.readAltitude(1013.25), 8, 2, charAlti);
ssd1306_printFixed(0, 48, "Approx altitude (m):", STYLE_NORMAL);
ssd1306_printFixed(60, 56, charAlti, STYLE_NORMAL);
Serial.println();
delay(2000);
}
Remark for connector:
My module come in Grove-like connector, but not in Grove standard pins order. So I have to re-order it by myself, to make it fit my Seeed Grove Breadboard.
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