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hc-12 basic example
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| #include <SoftwareSerial.h> | |
| SoftwareSerial HC12(10, 11); | |
| void setup() { | |
| Serial.begin(9600); | |
| HC12.begin(9600); | |
| pinMode(LED_BUILTIN, OUTPUT); | |
| } | |
| void loop() { | |
| if(HC12.available()){ | |
| String input = HC12.readString(); | |
| Serial.println(HC12.readString()); | |
| delay(1000); | |
| if (input == "Hello World") { | |
| digitalWrite(LED_BUILTIN, HIGH); | |
| delay(500); | |
| digitalWrite(LED_BUILTIN, LOW); | |
| } | |
| } | |
| } | |
| ################################## Other Device | |
| #include <SoftwareSerial.h> | |
| SoftwareSerial HC12(10, 11); | |
| void setup() { | |
| Serial.begin(9600); | |
| HC12.begin(9600); | |
| pinMode(LED_BUILTIN, OUTPUT); | |
| } | |
| void loop() { | |
| HC12.write("Hello World"); | |
| delay(2000); | |
| } | |
| ########## ESP8266 | |
| #include <SoftwareSerial.h> | |
| SoftwareSerial HC12(D7, D8); // HC-12 TX Pin, HC-12 RX Pin | |
| void setup() { | |
| Serial.begin(9600); | |
| HC12.begin(9600); | |
| pinMode(LED_BUILTIN, OUTPUT); | |
| } | |
| void loop() { | |
| if(HC12.available()){ | |
| String input = HC12.readString(); | |
| Serial.println(HC12.readString()); | |
| if (input == "Hello World") { | |
| digitalWrite(LED_BUILTIN, HIGH); | |
| delay(500); | |
| digitalWrite(LED_BUILTIN, LOW); | |
| } | |
| } | |
| } | |
| ############################### YL-39 + YL-69 humidity sensor | |
| // YL-39 + YL-69 humidity sensor | |
| byte humidity_sensor_pin = A1; | |
| byte humidity_sensor_vcc = 3; | |
| void setup() { | |
| // Init the humidity sensor board | |
| pinMode(humidity_sensor_vcc, OUTPUT); | |
| digitalWrite(humidity_sensor_vcc, HIGH); | |
| // Setup Serial | |
| while (!Serial); | |
| delay(1000); | |
| Serial.begin(9600); | |
| } | |
| int read_humidity_sensor() { | |
| digitalWrite(humidity_sensor_vcc, HIGH); | |
| delay(500); | |
| int value = analogRead(humidity_sensor_pin); | |
| digitalWrite(humidity_sensor_vcc, LOW); | |
| return 1023 - value; | |
| } | |
| void loop() { | |
| Serial.print("Humidity Level (0-1023): "); | |
| Serial.println(read_humidity_sensor()); | |
| delay(10000); | |
| } | |
| ########################### DHT11 | |
| // Example testing sketch for various DHT humidity/temperature sensors | |
| // Written by ladyada, public domain | |
| #include "DHT.h" | |
| #define DHTPIN 2 // what pin we're connected to | |
| // Uncomment whatever type you're using! | |
| #define DHTTYPE DHT11 // DHT 11 | |
| //#define DHTTYPE DHT22 // DHT 22 (AM2302) | |
| //#define DHTTYPE DHT21 // DHT 21 (AM2301) | |
| // Connect pin 1 (on the left) of the sensor to +5V | |
| // NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1 | |
| // to 3.3V instead of 5V! | |
| // Connect pin 2 of the sensor to whatever your DHTPIN is | |
| // Connect pin 4 (on the right) of the sensor to GROUND | |
| // Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor | |
| // Initialize DHT sensor for normal 16mhz Arduino | |
| //DHT dht(DHTPIN, DHTTYPE); | |
| // NOTE: For working with a faster chip, like an Arduino Due or Teensy, you | |
| // might need to increase the threshold for cycle counts considered a 1 or 0. | |
| // You can do this by passing a 3rd parameter for this threshold. It's a bit | |
| // of fiddling to find the right value, but in general the faster the CPU the | |
| // higher the value. The default for a 16mhz AVR is a value of 6. For an | |
| // Arduino Due that runs at 84mhz a value of 30 works. | |
| // Example to initialize DHT sensor for Arduino Due: | |
| DHT dht(DHTPIN, DHTTYPE, 6); | |
| void setup() { | |
| Serial.begin(9600); | |
| Serial.println("DHTxx test!"); | |
| dht.begin(); | |
| } | |
| void loop() { | |
| // Wait a few seconds between measurements. | |
| delay(2000); | |
| // Reading temperature or humidity takes about 250 milliseconds! | |
| // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor) | |
| float h = dht.readHumidity(); | |
| // Read temperature as Celsius | |
| float t = dht.readTemperature(); | |
| // Read temperature as Fahrenheit | |
| float f = dht.readTemperature(true); | |
| // Check if any reads failed and exit early (to try again). | |
| if (isnan(h) || isnan(t) || isnan(f)) { | |
| Serial.println("Failed to read from DHT sensor!"); | |
| return; | |
| } | |
| // Compute heat index | |
| // Must send in temp in Fahrenheit! | |
| float hi = dht.computeHeatIndex(f, h); | |
| 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(hi); | |
| Serial.println(" *F"); | |
| } |
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