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EspScopeA0-Bravo.ino
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EspScopeA0-Bravo.ino
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/*
This application is sampling analog input A0 of ESP8266
so it then can be displayed on-line in a web browser
Application consists of several files
Please check repository below for details
Repository: https://github.com/krzychb/EspScopeA0
Version: Bravo
File: EspScopeA0-Bravo.ino
Revision: 0.2.4
Date: 21-Sep-2016
Author: krzychb at gazeta.pl
Copyright (c) 2016 Krzysztof Budzynski. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <Arduino.h>
#include <ESP8266WiFi.h>
const char* ssid = "********";
const char* password = "********";
//
// Logging to ThingSpeak
//
#include <WiFiClient.h>
#define UPDATE_PERIOD 60000
#define TIMEOUT_PERIOD 1000
#define DATA_HOST "api.thingspeak.com"
#define API_KEY "your-api-key-here"
#ifdef ESP8266
extern "C" {
#include "user_interface.h"
}
#endif
// tracking of number of Wi-Fi reconnects
// and connection time
unsigned long numberOfReconnects;
unsigned long millisReconnected;
unsigned long timeConnected;
//
// Continuous sampling rate of A0 in this application is about 10 samples/ms
// Wi-Fi connection gets stuck if continuous A0 sampling is not paused
// Minimum pause duration depends on number of samples, for instance:
// 100 samples, pause 5ms
// 600 samples, pause 13ms
// Above values have been established experimentally using this application
// Check them out on your own - they may depend on version of SDK
//
// Ref: https://github.com/esp8266/Arduino/issues/1634
//
#define NUMBER_OF_SAMPLES 2000 // maximum number of samples taken
int samples[NUMBER_OF_SAMPLES];
int numberOfSamples = 20;
unsigned long samplingTime = 1; // time in us to collect all the numberOfSamples
int samplingPause = 1; // time in ms to pause between continuous sampling
unsigned long totalSamples;
unsigned long millisLastSample;
void analogSample(void)
{
// do not start sampling before pause time expires
if (millis() < millisLastSample + samplingPause)
{
return;
}
samplingTime = micros();
for (int i = 0; i < numberOfSamples; i++)
{
samples[i] = analogRead(A0);
totalSamples++;
}
samplingTime = micros() - samplingTime;
millisLastSample = millis();
}
unsigned long showStatisticsTimer;
void showStatistics(void)
{
// show statistics every 60s (60000ms)
if(millis() > showStatisticsTimer + 60000)
{
showStatisticsTimer = millis();
Serial.print(numberOfSamples);
Serial.print(" : ");
// average number of samples per second excluding pause time
Serial.print(numberOfSamples * 1000000 / samplingTime);
Serial.print(" 1/s : ");
Serial.print(samplingPause);
Serial.print("ms : ");
Serial.print(numberOfReconnects);
Serial.print(" : ");
timeConnected = (millis() - millisReconnected) / 1000;
Serial.print(timeConnected);
Serial.print("s : ");
// average number of samples per second including pause time
// since last connected / reconnected to Wi-Fi
Serial.print(totalSamples / timeConnected);
Serial.print(" 1/s");
Serial.println();
}
}
void logToThingSpeak(void)
{
WiFiClient client;
static long dataLogTimer;
static long transmissionAttempts;
static long replyTimeouts;
static long connectionFailures;
static long postingTime = 0;
Serial.printf("DATALOG > %s ", DATA_HOST);
// Wait if this is too soon to send data
while (millis() - dataLogTimer < UPDATE_PERIOD)
{
Serial.print(".");
delay(500);
}
Serial.print(" > ");
dataLogTimer = millis();
transmissionAttempts++;
// connect to the host
if (!client.connect(DATA_HOST, 80))
{
Serial.print("Connection failure!");
connectionFailures++;
return;
}
Serial.print("Sending > ");
// send the data to the host
client.print(
String("GET /update?key=") + API_KEY +
"&field1=" + String (dataLogTimer / 60000) +
"&field2=" + String (postingTime) +
"&field3=" + String (connectionFailures) +
"&field4=" + String (numberOfReconnects) +
"&field5=" + String (timeConnected) +
"&field6=" + String (totalSamples) +
"&field7=" + String (samplingPause) +
"&field8=" + String (numberOfSamples) +
" " +
"HTTP/1.1\r\n" +
"Host: " + DATA_HOST + "\r\n" +
"Connection: close\r\n\r\n");
// wait for reply from the host
while (!client.available())
{
if (millis() - dataLogTimer > TIMEOUT_PERIOD)
{
Serial.println("Reply timeout!");
replyTimeouts++;
postingTime = -(millis() - dataLogTimer);
client.stop();
return;
}
}
// show reply from the host
while (client.available())
{
Serial.write(client.read());
}
Serial.print(" > Done");
client.stop();
// show time to log the data
postingTime = millis() - dataLogTimer;
Serial.printf(" in %d ms\n", postingTime);
}
void nextSettings(void)
{
numberOfSamples = numberOfSamples * 1.66 + 0.5;
if (numberOfSamples > NUMBER_OF_SAMPLES)
{
numberOfSamples = 20;
samplingPause = samplingPause * 1.66 + 0.5;
if (samplingPause > 110)
{
samplingPause = 1;
}
}
}
//
// Monitor Wi-Fi connection if it is alive
// If not alive then wait until it reconnects
//
void isWiFiAlive(void)
{
timeConnected = (millis() - millisReconnected) / 1000;
if (WiFi.status() != WL_CONNECTED)
{
Serial.print("Not connected ");
while (WiFi.status() != WL_CONNECTED)
{
Serial.print(".");
delay(500);
}
Serial.println(" now connected");
logToThingSpeak();
nextSettings();
totalSamples = 0;
numberOfReconnects++;
millisReconnected = millis();
showStatisticsTimer = millisReconnected;
}
// log anyway if connected for a longer than 5 minutes
// 5 mintues = 300000 ms
if(millis() - millisReconnected > 300000)
{
logToThingSpeak();
nextSettings();
totalSamples = 0;
millisReconnected = millis();
showStatisticsTimer = millisReconnected;
}
}
void setup(void)
{
Serial.begin(115200);
Serial.println("\nEspScopeA0-Bravo 0.2.4");
WiFi.persistent(false);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
Serial.printf("Connecting to %s\n", ssid);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println();
Serial.print("Connected, IP address: ");
Serial.println(WiFi.localIP());
}
void loop(void)
{
isWiFiAlive();
analogSample();
showStatistics();
}