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WLAN_Thermometer
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WLAN_Thermometer/WLAN_Thermometer.ino

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// Use from 0 to 4. Higher number, more debugging messages and memory usage.
#define _WIFIMGR_LOGLEVEL_ 1
#define DEBUG 1
#include <WiFi.h>
#include <WiFiManager.h>
#include "debug.h"
#include <Arduino.h>
#include <ESPmDNS.h>
#include <LiquidCrystal_I2C.h>
#include <looper.h>
#include <RunningMedian.h>
#include <ESPDateTime.h>
#include <Time.h>
#define MDNS_NAME "wlanthermometer"
#define AP_SSID_CONFIG_NAME "WLANTHERMOMETER-Config"
#define AP_CONFIG_PASSWORD "wlanthermometer"
#define AP_DATA_RESET_PIN 25
#define TEMP_SENS_PIN 34
#define LCD_I2C_ADDR 0x3f
#define LCD_COL 20
#define LCD_ROW 4
#define KRATE_TEMP 5000
#define KRATE_TIME 500
#define KRATE_RESET_AP_DATA 5000
#define MEDIAN_SAMPLES 60
#define ONBOARD_LED 2
#define NTP_TIMEOUT 15000
#define WIFI_CONNECT_TIMEOUT 30
#define CFG_PORTAL_TIMEOUT 90
LiquidCrystal_I2C lcd(LCD_I2C_ADDR, LCD_COL, LCD_ROW);
looper sched;
RunningMedian samples = RunningMedian(MEDIAN_SAMPLES);
float temp_min;
float temp_max;
float temp;
bool led_state;
String header;
WiFiServer server(80);
const uint8_t degree_sign[8] = { B00010, B00101, B00010, B00000, B00000, B00000, B00000, B00000 };
uint8_t add_summertime = 0;
bool last_config_check = false;
void setup()
{
pinMode(AP_DATA_RESET_PIN, INPUT_PULLDOWN);
pinMode(ONBOARD_LED, OUTPUT);
Serial.begin(115200);
Serial.println(F("WLANThermometer (c)2020 H. Wirtz <wirtz@parasitstudio.de>"));
lcd.init();
lcd.backlight();
lcd.clear();
lcd.noCursor();
lcd.setCursor(2, 0);
lcd.print(F("WLAN THERMOMETER"));
lcd.setCursor(2, 1);
lcd.print(F("(c)parasiTstudio"));
DEBUG_MSG("Mode Client\n");
WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP
WiFiManager wm;
lcd.setCursor(0, 2);
lcd.print(F("Connecting WiFi... "));
lcd.setCursor(0, 3);
lcd.print(F("CFG-AP: 192.168.4.1"));
wm.setConnectTimeout(WIFI_CONNECT_TIMEOUT);
wm.setConfigPortalTimeout(CFG_PORTAL_TIMEOUT);
wm.setBreakAfterConfig(true);
if (!wm.autoConnect(AP_SSID_CONFIG_NAME, AP_CONFIG_PASSWORD))
{
lcd.setCursor(0, 2);
lcd.print(F("Failed "));
DEBUG_MSG("Failed to connect\n");
delay(1000);
lcd.setCursor(8, 2);
lcd.print(F("- restart"));
delay(1000);
ESP.restart();
}
else
{
DEBUG_MSG("Connected\n");
if (!MDNS.begin(MDNS_NAME))
{
DEBUG_MSG("Error setting up MDNS responder!\n");
}
else
{
DEBUG_MSG("mDNS started.\n");
}
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(F("Mode WiFi client"));
lcd.setCursor(0, 1);
lcd.print(WiFi.localIP());
delay(500);
}
lcd.setCursor(0, 3);
lcd.print("Getting time...");
DateTime.setTimeZone(1);
DateTime.begin(NTP_TIMEOUT);
while (!DateTime.isTimeValid())
{
Serial.println("Failed to get time from server.");
DateTime.forceUpdate();
}
if (is_wintertime(DateTime.getTime()) == false)
add_summertime = 1;
else
add_summertime = 0;
// create a degree sign
lcd.createChar(0, (uint8_t*)degree_sign);
server.begin();
sched.addJob(show_temperature, KRATE_TEMP);
sched.addJob(show_time, KRATE_TIME);
sched.addJob(start_config_portal, KRATE_RESET_AP_DATA);
temp_min = get_temp_sensor_data();
temp_max = temp_min;
temp = temp_min;
lcd.clear();
show_time();
show_temperature();
}
void loop()
{
sched.scheduler();
WiFiClient client = server.available(); // Listen for incoming clients
if (client) { // If a new client connects,
Serial.println("New Client."); // print a message out in the serial port
String currentLine = ""; // make a String to hold incoming data from the client
while (client.connected())
{ // loop while the client's connected
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
Serial.write(c); // print it out the serial monitor
header += c;
if (c == '\n') { // if the byte is a newline character
// if the current line is blank, you got two newline characters in a row.
// that's the end of the client HTTP request, so send a response:
if (currentLine.length() == 0) {
// checking if header is valid
// YWRtaW46c3RhYWdhcg== (user:pass) admin:staagar
if (header.indexOf("YWRtaW46c3RhYWdhcg==") >= 0) {
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("Connection: close");
client.println();
client.println("<!DOCTYPE html>\n");
client.println("<html>\n");
client.println("<meta http-equiv=\"refresh\" content=\"5\">\n");
client.println("<body>\n");
client.println("<center>\n");
client.println("<h1 style=\"color:blue;\">Temperatur Kirche</h1>\n");
client.print("<h2 style=\"color:green;\">Aktuell: ");
client.print(temp);
client.println(" &deg;C</h2>\n");
client.print("<h2 style=\"color:green;\">Minimum: ");
client.print(temp_min);
client.println(" &deg;C</h2>\n");
client.print("<h2 style=\"color:green;\">Maximum: ");
client.print(temp_max);
client.println(" &deg;C</h2>\n");
client.println("</center>\n");
client.println("</body>\n");
client.println("</html>");
break;
}
// Wrong user or password, so HTTP request fails...
else {
client.println("HTTP/1.1 401 Unauthorized");
client.println("WWW-Authenticate: Basic realm=\"Secure\"");
client.println("Content-Type: text/html");
client.println();
client.println("<html>Authentication failed</html>");
break;
}
} else { // if you got a newline, then clear currentLine
currentLine = "";
}
} else if (c != '\r') { // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine
}
}
}
// Clear the header variable
header = "";
// Close the connection
client.stop();
Serial.println("Client disconnected.");
Serial.println("");
}
}
void start_config_portal(void)
{
if (digitalRead(AP_DATA_RESET_PIN) == HIGH && last_config_check == true)
{
DEBUG_MSG("Reset AP data\n");
WiFiManager wm;
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Resetting AP Data");
delay(2000);
wm.resetSettings();
lcd.setCursor(0, 1);
lcd.print("Done.");
delay(1000);
ESP.restart();
}
else if (digitalRead(AP_DATA_RESET_PIN) == HIGH)
{
if (digitalRead(AP_DATA_RESET_PIN) == HIGH)
DEBUG_MSG("Reset AP data pressed\n");
last_config_check = true;
}
else
last_config_check = false;
}
void show_time(void)
{
DateTimeParts p = DateTime.getParts();
char dt[21];
if (p.getHours() == 0 && p.getMinutes() == 0 && p.getSeconds() == 0)
DateTime.forceUpdate();
if ((p.getHours() == 2 || p.getHours() == 3) && p.getMinutes() == 0 && p.getSeconds() == 0)
{
if (is_wintertime(DateTime.getTime()) == false)
add_summertime = 1;
else
add_summertime = 0;
}
sprintf(dt, "%02d.%02d.%4d %02d:%02d:%02d", p.getMonthDay(), p.getMonth() + 1, p.getYear(), p.getHours() + add_summertime, p.getMinutes(), p.getSeconds());
Serial.print(dt);
if (add_summertime > 0)
Serial.println(" Summertime");
else
Serial.println(" Wintertime");
lcd.setCursor(0, 0);
lcd.print(dt);
digitalWrite(ONBOARD_LED, led_state);
led_state = !led_state;
}
void show_temperature(void)
{
float new_temp = get_temp_sensor_data();
DEBUG_MSG("Temperature: %02.2f\n", new_temp);
if (new_temp > temp)
{
if (new_temp - temp > 1.0)
temp = temp + 1.0;
else
temp = new_temp;
}
else if (new_temp < temp)
{
if (new_temp - temp < -1.0)
temp = temp - 1.0;
else
temp = new_temp;
}
samples.add(temp);
if (samples.getLowest() < temp_min)
temp_min = samples.getLowest();
if (samples.getHighest() > temp_max)
temp_max = samples.getHighest();
lcd.setCursor(0, 1);
lcd.print("Temperatur: ");
lcd.print(temp);
lcd.write(0);
lcd.print("C");
lcd.setCursor(0, 2);
lcd.print("Minimum: ");
lcd.print(temp_min);
lcd.write(0);
lcd.print("C");
lcd.setCursor(0, 3);
lcd.print("Maximum: ");
lcd.print(temp_max);
lcd.write(0);
lcd.print("C");
}
bool is_wintertime(time_t t)
{
// Sommerzeit/Winterzeit http://manfred.wilzeck.de/Datum_berechnen.html#Jahreszahl
// Tag = 31 – ( 4 + Jahr*5 / 4) MOD 7 ' Datum Tag für Beginn Sommerzeit (Jahr 4-stellig)
// Tag = 31 – ( 1 + Jahr*5 / 4) MOD 7 ' Datum Tag für Ende Sommerzeit (Jahr 4-stellig)
tmElements_t tm;
byte day_of_switch[2];
time_t switch_secs[2];
byte i;
day_of_switch[0] = 31 - (4 + year(t) * 5 / 4) % 7; // winter->summer
day_of_switch[1] = 31 - (1 + year(t) * 5 / 4) % 7; // summer->winter
for (i = 0; i < 2; i++)
{
tm.Second = 0;
if (i == 0)
tm.Hour = 2;
else
tm.Hour = 3;
tm.Minute = 0;
tm.Day = day_of_switch[i];
if (i == 0)
tm.Month = 3;
else
tm.Month = 10;
tm.Year = year(t) - 1970;
switch_secs[i] = makeTime(tm);
}
if (t >= switch_secs[0] && t < switch_secs[1])
return (false);
else
return (true);
}
float get_temp_sensor_data(void)
{
float t = constrain((analogRead(TEMP_SENS_PIN) / 2048.0) * 330.0, 0.0, 50.0);
return (t);
}