ESP8266 Community Forum

- Sun Apr 03, 2016 11:31 am #44737 I have a strange effect with this sketch. It is basically a web server exposing data collected from a DHT22 and BMP180.
The serial console display weird symbols. But everything else seems working.

Someone could help, please? Thank you very much.

[ code]
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP085_U.h>
#include "DHT.h"
#include "BasicWeatherServerTypes.h"

//Attention: Connect a 10K resistor from DHT pin 2 (data) to pin 1 (power) of the sensor

// ESP8266 ro Arduino GPIO number
#define D0 16
//#define D1 5
//#define D2 4
//#define D3 0
#define D4 2
#define D5 14
//#define D6 12
//#define D7 13
//#define D8 15
//#define D9 3
#define D10 1
//#define D11 9
//#define D12 10

#define DHTPIN D10 // what digital pin we're connected to

#define OSS 1 -- oversampling setting (0-3)
#define SDA_PIN D4 // sda pin
#define SCL_PIN D5 // scl pin

Adafruit_BMP085_Unified bmp = Adafruit_BMP085_Unified(12345);

// Uncomment whatever type you're using!
//#define DHTTYPE DHT11 // DHT 11
#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
//#define DHTTYPE DHT21 // DHT 21 (AM2301)

//Logger logger("*WeatherStation:");

DHT dht(DHTPIN, DHTTYPE);

#define READ_TIMEOUT 5000

const char* server_version = "1.0.1";

const char* ssid = "IvanWireless";
const char* password = "unbreakable";

MDNSResponder mdns;

ESP8266WebServer server(80);

const int led = D0;

// Variables

float_value _pressure = {"Pressure:", "pressure", 0.0, "hPa"};
float_value _temperature_c = {"Temperature:", "temperature_c", 0.0, "*C"};
float_value _temperature_f = {"Temperature:", "temperature_f", 0.0, "*F"};
float_value _heat_index_c = {"Heat index:", "heat_index_c", 0.0, "*C"};
float_value _heat_index_f = {"Heat index:", "heat_index_f", 0.0, "*F"};
long_value _humidity = {"Humidity:", "humidity", 0, "%"};

sensor_data_type sensor_data = {_pressure, _temperature_c, _temperature_f, _heat_index_c, _heat_index_f, _humidity};

long lastReadingTime = 0;

// Utilities

void blinkLedOnce(int onTime, int offTime) {
digitalWrite(led, LOW); // turn the LED on (HIGH is the voltage level)
delay(onTime); // wait for a onTime ms
digitalWrite(led, HIGH); // turn the LED off by making the voltage LOW
delay(offTime); // wait for a offTime ms
}

void blinkLed(int times, int onTime, int offTime) {
for (int i = 1; i < times; i++) {
blinkLedOnce(onTime, offTime);
}
}

void serverSend(int status, String contentType, String msg) {
server.sendHeader("Connection", "close");
server.sendHeader("Access-Control-Allow-Origin", "*");
server.send(status, contentType, msg);
}

// Program
void versionHandler() {
digitalWrite(led, LOW);
String message = "ESP8266 Server \r\nversion:";
message += server_version;
serverSend(200, "text/plain", message);
digitalWrite(led, HIGH);
}

String textLine(float_value v1, float_value v2) {
String message = "";
message += v1.label;
message += " \t\t";
message += v1.value;
message += " ";
message += v1.UoM;
message += "\t\t";
message += v2.value;
message += " ";
message += v2.UoM;
message += "\r\n\r\n";

return message;
}

void textSensorsHandler() {
digitalWrite(led, LOW);

String message = "Weather Station report: \r\n\r\n\r\n";
message += sensor_data.humidity.label;
message += " \t\t";
message += sensor_data.humidity.value;
message += " ";
message += sensor_data.humidity.UoM;
message += "\r\n\r\n";

message += textLine(sensor_data.temperature_c, sensor_data.temperature_f);
message += textLine(sensor_data.heat_index_c, sensor_data.heat_index_f);

message += sensor_data.pressure.label;
message += " \t\t";
message += sensor_data.pressure.value;
message += " ";
message += sensor_data.pressure.UoM;

serverSend(200, "text/plain", message);
digitalWrite(led, HIGH);
}

String jsonLine(float_value v) {
String message = "";
message += "\"";
message += v.field;
message += "\":{\"value\":";
message += v.value;
message += ",\"UoM\":\"";
message += v.UoM;
message += "\"},";

return message;
}

void jsonSensorsHandler() {
digitalWrite(led, LOW);

String message = "{\"";
message += sensor_data.humidity.field;
message += "\":{\"value\":";
message += sensor_data.humidity.value;
message += ",\"UoM\":\"";
message += sensor_data.humidity.UoM;
message += "\"},";

message += jsonLine(sensor_data.temperature_c);
message += jsonLine(sensor_data.temperature_f);
message += jsonLine(sensor_data.heat_index_c);
message += jsonLine(sensor_data.heat_index_f);

message += "\"";
message += sensor_data.pressure.field;
message += "\":{\"value\":";
message += sensor_data.pressure.value;
message += ",\"UoM\":\"";
message += sensor_data.pressure.UoM;
message += "\"}}";
serverSend(200, "application/json", message);
digitalWrite(led, HIGH);
}

void textError404handler(){
String message = "File Not Found\n\n";
message += "URI: ";
message += server.uri();
message += "\nMethod: ";
message += (server.method() == HTTP_GET)?"GET":"POST";
message += "\nArguments: ";
message += server.args();
message += "\n";
for (uint8_t i=0; i<server.args(); i++){
message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
}
serverSend(404, "text/plain", message);
blinkLed(3, 200, 200);
}

void error404handler() {
textError404handler();
}


void getData() {
//Serial.begin();
Serial.print(F("Free heap:"));
Serial.print(ESP.getFreeHeap(), DEC);
//Serial.end();
/* Get a new sensor event */
sensors_event_t event;
bmp.getEvent(&event);

/* Display the results (barometric pressure is measure in hPa) */
if (event.pressure)
{
sensor_data.pressure.value = event.pressure;
}

// 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 (the default)
float t = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);

// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
blinkLed(3, 200, 200);
Serial.println("Failed to read from DHT sensor!");
return;
}

// Compute heat index in Fahrenheit (the default)
float hif = dht.computeHeatIndex(f, h);
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(t, h, false);

sensor_data.temperature_c.value = t;
sensor_data.temperature_f.value = f;
sensor_data.heat_index_c.value = hic;
sensor_data.heat_index_f.value = hif;
sensor_data.humidity.value = h;

blinkLed(3, 100, 100);
}

void setup(void){
//Serial.begin(115200);

Serial.begin(9600);
Serial.println("DHTxx test!");

dht.begin();

Wire.begin(SDA_PIN, SCL_PIN);

bmp.begin();

pinMode(led, OUTPUT);
digitalWrite(led, HIGH);

WiFi.begin(ssid, password);
Serial.println("");

// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());

if (mdns.begin("esp8266", WiFi.localIP())) {
Serial.println("MDNS responder started");
}

server.on("/", textSensorsHandler);

server.on("/sensors.txt", textSensorsHandler);
server.on("/sensors.json", jsonSensorsHandler);

server.on("/version", versionHandler);

/*
server.on("/inline", [](){
server.send(200, "text/plain", "this works as well");
});
*/

server.onNotFound(error404handler);

server.begin();
Serial.println("HTTP server started");
blinkLed(10, 50, 100);
}

void loop(void){
if (millis() - lastReadingTime > READ_TIMEOUT) {
// if there's a reading ready, read it:
// don't do anything until the data ready pin is high:
//if (digitalRead(dataReadyPin) == HIGH) {
getData();
// timestamp the last time you got a reading:
lastReadingTime = millis();
//}
}

server.handleClient();
} [/code]