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  • Log-Temperature-Sensor-and-send-data-to-Node-red.ino

Details

Log-Temperature-Sensor-and-send-data-to-Node-red.ino

Author

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	1	+XWiki.Kilight

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	1	+3.6 KB

Content

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	1	+#include <SoftwareSerial.h>
	2	+#include <Adafruit_Sensor.h>
	3	+#include <DHT.h>
	4	+#include <DHT_U.h>
	5	+/*
	6	+
	7	+*/
	8	+#define DHTPIN 8 // Digital pin connected to the DHT sensor
	9	+#define DHTTYPE DHT11 // DHT 11
	10	+DHT_Unified dht(DHTPIN, DHTTYPE);
	11	+
	12	+String inputString = ""; // a String to hold incoming data
	13	+bool stringComplete = false; // whether the string is complete
	14	+
	15	+long old_time=millis();
	16	+long new_time;
	17	+
	18	+long uplink_interval=30000; //ms
	19	+
	20	+float DHT11_temp;
	21	+float DHT11_hum;
	22	+
	23	+SoftwareSerial ss(10, 11); // Arduino RX, TX ,
	24	+
	25	+char rxbuff[128];
	26	+uint8_t rxbuff_index=0;
	27	+
	28	+void setup() {
	29	+ // initialize serial
	30	+ Serial.begin(9600);
	31	+
	32	+ ss.begin(9600);
	33	+ ss.listen();
	34	+
	35	+ // reserve 200 bytes for the inputString:
	36	+ inputString.reserve(200);
	37	+
	38	+ dht.begin();
	39	+ sensor_t sensor;
	40	+ dht.temperature().getSensor(&sensor);
	41	+ dht.humidity().getSensor(&sensor);
	42	+
	43	+ ss.println("ATZ");//reset LA66
	44	+}
	45	+
	46	+void loop() {
	47	+
	48	+ while ( ss.available()) {
	49	+ // get the new byte:
	50	+ char inChar = (char) ss.read();
	51	+ // add it to the inputString:
	52	+ inputString += inChar;
	53	+
	54	+ rxbuff[rxbuff_index++]=inChar;
	55	+
	56	+ if(rxbuff_index>128)
	57	+ {
	58	+ rxbuff[rxbuff_index]='\0';
	59	+ rxbuff_index=0;
	60	+ break;
	61	+ }
	62	+
	63	+ // if the incoming character is a newline, set a flag so the main loop can
	64	+ // do something about it:
	65	+ if (inChar == '\n' || inChar == '\r') {
	66	+ stringComplete = true;
	67	+ rxbuff[rxbuff_index]='\0';
	68	+ rxbuff_index=0;
	69	+ }
	70	+ }
	71	+
	72	+ while ( Serial.available()) {
	73	+ // get the new byte:
	74	+ char inChar = (char) Serial.read();
	75	+ // add it to the inputString:
	76	+ inputString += inChar;
	77	+ // if the incoming character is a newline, set a flag so the main loop can
	78	+ // do something about it:
	79	+ if (inChar == '\n' || inChar == '\r') {
	80	+ ss.print(inputString);
	81	+ inputString = "\0";
	82	+ }
	83	+ }
	84	+
	85	+ // print the string when a newline arrives:
	86	+ if (stringComplete) {
	87	+ Serial.print(inputString);
	88	+
	89	+ // clear the string:
	90	+ inputString = "\0";
	91	+ stringComplete = false;
	92	+ }
	93	+
	94	+ new_time = millis();
	95	+
	96	+ if(new_time-old_time>=uplink_interval){
	97	+ old_time = new_time;
	98	+
	99	+ Serial.print(F("\r\n"));
	100	+ // Get temperature event and print its value.
	101	+ sensors_event_t event;
	102	+ dht.temperature().getEvent(&event);
	103	+ if (isnan(event.temperature)) {
	104	+ Serial.println(F("Error reading temperature!"));
	105	+ DHT11_temp=327.67;
	106	+ }
	107	+ else {
	108	+ DHT11_temp=event.temperature;
	109	+
	110	+ if(DHT11_temp>60){
	111	+ DHT11_temp=60;
	112	+ }
	113	+ else if(DHT11_temp<-20){
	114	+ DHT11_temp=-20;
	115	+ }
	116	+ }
	117	+ // Get humidity event and print its value.
	118	+ dht.humidity().getEvent(&event);
	119	+ if (isnan(event.relative_humidity)) {
	120	+ DHT11_hum=327.67;
	121	+ Serial.println(F("Error reading humidity!"));
	122	+ }
	123	+ else {
	124	+ DHT11_hum=event.relative_humidity;
	125	+
	126	+ if(DHT11_hum>100){
	127	+ DHT11_hum=100;
	128	+ }
	129	+ else if(DHT11_hum<0){
	130	+ DHT11_hum=0;
	131	+ }
	132	+ }
	133	+
	134	+ Serial.print(F("Temperature: "));
	135	+ Serial.print(DHT11_temp);
	136	+ Serial.println(F("°C"));
	137	+ Serial.print(F("Humidity: "));
	138	+ Serial.print(DHT11_hum);
	139	+ Serial.println(F("%"));
	140	+ Serial.print(F("\r\n"));
	141	+
	142	+ char sensor_data_buff[128]="\0";
	143	+
	144	+ //confirm status,Fport,payload length,payload(HEX)
	145	+ snprintf(sensor_data_buff,128,"AT+SEND=0,%02X%02X%02X%02X,0,0",(short)(DHT11_temp*100)>>8 & 0xFF,(short)(DHT11_temp*100) & 0xFF,(short)(DHT11_hum*10)>>8 & 0xFF,(short)(DHT11_hum*10) & 0xFF);
	146	+ ss.print(sensor_data_buff);
	147	+ ss.print('\r');
	148	+ }
	149	+}
	150	+