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Thinkspeak과 아두이노 esp8266사용할 때 초음파센서값이 0이 나오는 이유가 궁금합니다.
yoon423 | 2019-03-29
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보드는 esp8266사용하고있고, 와이파이까지 연결은 다 되서 thinkspeak에 그래프는 성공적으로 그려졌는데 오렌지보드에서는 잘 되던 초음파센서가 자꾸 값이 0으로만 나옵니다. 코딩은 아래와 같이 작성했고, 5v어뎁터도 꽂았고, 빵판과 보드연결은 vcc-5v, gnd-gnd, trig-d5, echo-d4에 연결했습니다. 또 아두이노에서는 보드를 "Adafruit Feather HUZZAH ESP8266", upload Speed = 115200으로 설정했는데 센서값이 자꾸 0으로 나오는 이유는 뭘까요..? #include <ESP8266WiFi.h>
#include <OneWire.h>
#include <PubSubClient.h>
const char *ssid = "*****"; //Your Access Point or Personal Hotspot, cannot be longer than 32 characters!
const char *pass = "*************"; //Your Access Point or Personal Hotspot password
const char* serverTS = "api.thingspeak.com";
String apiKey = "B*************N"; //Insert your Channel API Key here
//const int pingPin = 2; //Ultrasonic connected to GPIO0
int TRIGGER = 5; //Pin D1 = TRIGGER
int ECHO = 4; //Pin D2 = ECHO
void setup()
{
pinMode(0,OUTPUT); //LED connected to GPIO2
Serial.begin(115200); //Recommended speed is 115200
pinMode(TRIGGER,OUTPUT);
pinMode(ECHO,INPUT);
connectWifi();
}
void loop()
{
// establish variables for duration of the ping,
// and the distance result in inches and centimeters:
long duration, inches, cm;
// The PING))) is triggered by a HIGH pulse of 2 or more microseconds.
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
digitalWrite(TRIGGER, LOW);
delayMicroseconds(2);
digitalWrite(TRIGGER, HIGH);
delayMicroseconds(10);
digitalWrite(TRIGGER, LOW);
// The same pin is used to read the signal from the PING))): a HIGH
// pulse whose duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
duration = pulseIn(ECHO, HIGH);
// convert the time into a distance
inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
Serial.print(inches);
Serial.print("in, ");
Serial.print(cm);
Serial.print("cm");
Serial.println();
delay(100);
digitalWrite(2, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(2, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
sendHeight(cm);
}
void connectWifi()
{
Serial.print("Connecting to "+*ssid);
WiFi.begin(ssid, pass);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.print(".");
}
Serial.println("");
Serial.println("Connected");
Serial.println("");
}
long microsecondsToInches(long microseconds)
{ // According to Parallax's datasheet for the PING))), there are
// 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
// second). This gives the distance travelled by the ping, outbound
// and return, so we divide by 2 to get the distance of the obstacle.
// See: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
return microseconds / 74 / 2;
}
long microsecondsToCentimeters(long microseconds) {
// The speed of sound is 340 m/s or 29 microseconds per centimeter.
// The ping travels out and back, so to find the distance of the
// object we take half of the distance travelled.
return microseconds / 29 / 2;
}
void sendHeight(float cm)
{
WiFiClient tclient;//not to be confused with "client" in PubSub{}, and wclient for mqtt
if (tclient.connect(serverTS, 80)) { // use ip 184.106.153.149 or api.thingspeak.com
//Serial.println("WiFi Client connected ");
String postStr = apiKey;
postStr += "&field1=";
postStr += String(cm);
postStr += "\r\n\r\n";
tclient.print("POST /update HTTP/1.1\n");
tclient.print("Host: api.thingspeak.com\n");
tclient.print("Connection: close\n");
tclient.print("X-THINGSPEAKAPIKEY: " + apiKey + "\n");
tclient.print("Content-Type: application/x-www-form-urlencoded\n");
tclient.print("Content-Length: ");
tclient.print(postStr.length());
tclient.print("\n\n");
tclient.print(postStr);
delay(1000);
}
tclient.stop();
}
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| 이전글 | Sharp / GP2Y1010AU0F 미세먼지 센서 data 값이 어떤 부분이랑 코드적으로... | 2019-03-29 |
| 다음글 | 컴파일은 되는데 소스가 충돌이 난것 같습니다...... | 2019-03-30 |
