Schematic
Wire up the hardware accordingly
Display humidity and temperature every second with DHT22 sensor
// Refer: https://github.com/adafruit/DHT-sensor-library/blob/master/examples/DHTtester/DHTtester.ino
#include "DHT.h"
#define DHTPIN 4 // D2 on WeMos is GPIO04
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(9600);
Serial.setTimeout(2000);
while(!Serial) { }
Serial.println("Device Started");
Serial.println("-------------------------------------");
Serial.println("Running DHT!");
Serial.println("-------------------------------------");
}
int timeSinceLastRead = 0;
void loop() {
if(timeSinceLastRead > 2000) {
float h = dht.readHumidity();
float t = dht.readTemperature();
float f = dht.readTemperature(true);
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println("Failed to read from DHT sensor!");
timeSinceLastRead = 0;
return;
}
float hif = dht.computeHeatIndex(f, h);
float hic = dht.computeHeatIndex(t, h, false);
Serial.print("Humidity: ");
Serial.print(h);
Serial.print(" %\t");
Serial.print("Temperature: ");
Serial.print(t);
Serial.print(" *C ");
Serial.print(f);
Serial.print(" *F\t");
Serial.print("Heat index: ");
Serial.print(hic);
Serial.print(" *C ");
Serial.print(hif);
Serial.println(" *F");
timeSinceLastRead = 0;
}
delay(100);
timeSinceLastRead += 100;
}BOARD?=esp8266com:esp8266:d1_mini
PORT?=/dev/cu.wchusbserial1410
BUILD=build
# Arduino CLI version 0.14.0 is used.
.PHONY: default lint all flash clean
default: lint all flash clean
lint:
cpplint --extensions=ino --filter=-legal/copyright *.ino
all:
arduino-cli compile --fqbn $(BOARD) --output-dir $(BUILD) ./
flash:
arduino-cli upload --fqbn $(BOARD) --port $(PORT) --input-dir $(BUILD)
clean:
rm -r buildWire up the hardware accordingly