macrocell_office_iot/envisens/envisens_esp_fw/sensing.cpp

111 lines
3.3 KiB
C++

/* ESP8266 environmental sensor project
This file provides functions for all the sensor publication used in espsens and envisens.
(C) 2019 Macrocell - Environmental sensing solutions
proudly presented by Macrocell - FPGA Innovators
*/
#include <WString.h>
#include "Arduino.h"
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include "configuration.h"
#include "sensing.h"
void setup_wifi() {
delay(10);
// Connect to a WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(WIFI_SSID);
WiFi.begin(WIFI_SSID, WIFI_PW);
WiFi.mode(WIFI_STA);
// blink LED fast until WiFi is connected
while (WiFi.status() != WL_CONNECTED) {
delay(200);
digitalWrite(LED_BUILTIN, HIGH);
Serial.print(".");
delay(200);
digitalWrite(LED_BUILTIN, LOW);
}
// WiFi connected
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void reconnect(PubSubClient client) {
// Loop until reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (client.connect(MQTT_CLIENT, MQTT_USER, MQTT_PW)) {
Serial.println("connected");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
digitalWrite(LED_BUILTIN, HIGH);
// Wait 5 seconds before retrying
delay(4000);
digitalWrite(LED_BUILTIN, LOW);
delay(1000);
}
}
}
bool checkVariation(float newValue, float prevValue, float maxDiff) {
return !isnan(newValue) &&
(newValue < prevValue - maxDiff || newValue > prevValue + maxDiff);
}
bool checkPlausibility(float newValue, float prevValue, float maxDiff) {
return (newValue < prevValue + (maxDiff * 10) || newValue > prevValue - (maxDiff * 10));
}
void publishSensor (PubSubClient &client, Sensor &sensor){
bool force = false;
Serial.print("Sample " + sensor.desc + " : ");
Serial.print(String(sensor.value).c_str());
Serial.print(" last : ");
Serial.print(String(sensor.lastValue).c_str());
Serial.print(" samples since last update : ");
Serial.println(String(sensor.lastUpdate).c_str());
// check if first sample, set lastValue and return
if (sensor.lastUpdate == -1){
sensor.lastValue = sensor.value;
sensor.lastUpdate = 0;
return;
}
// force an update if the number of samples without update is exceeded
force = sensor.lastUpdate >= FORCE_PERIOD;
if (force) {
Serial.println(" * Forcing publication if sensor value is plausible");
}
// update the sample counter, will be reset if sample is published
sensor.lastUpdate += 1;
// check if there was sufficient variation on the signal and if the value is plausible
if (checkVariation(sensor.value, sensor.lastValue, sensor.diff) or force) {
Serial.println(" Sufficient variation on " + sensor.desc + ": " + String(sensor.value).c_str());
if (checkPlausibility(sensor.value, sensor.lastValue, sensor.diff)) {
Serial.println(" Value published");
client.publish(sensor.topic, String(sensor.value).c_str(), true);
sensor.lastUpdate = 0;
} else {
Serial.print(" ** ERROR: Value out of bounds, not published. Last value :");
Serial.println(String(sensor.lastValue).c_str());
}
sensor.lastValue = sensor.value;
}
}