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WLAN_Thermometer
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WLAN_Thermometer/WLAN_Thermometer.ino

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// Compiling:
// ESP32 Wroover Module
//
// Use from 0 to 4. Higher number, more debugging messages and memory usage.
//#define _WIFIMGR_LOGLEVEL_ 4
//#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 <ESPDateTime.h>
#include <Time.h>
#include <DHT.h>
#include <esp_task_wdt.h>
#include <uptime.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 27
#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 KRATE_CHECK_DATETIME 250000
#define ONBOARD_LED 2
#define NTP_TIMEOUT 30000
#define NTP_SERVER "time.fu-berlin.de"
#define WIFI_CONNECT_TIMEOUT 30
#define CFG_PORTAL_TIMEOUT 90
#define DHTTYPE DHT22
#define FIRST_MIN_MAX 300000 // = 5 min
#define HTML_RELOAD_PAGE_SECS 30
#define WDT_TIMEOUT 300
#define RESET_AFTER_DAYS 7
LiquidCrystal_I2C lcd(LCD_I2C_ADDR, LCD_COL, LCD_ROW);
looper sched;
float temp[3] = { NAN, NAN, NAN };
float hum[3] = { NAN, NAN, NAN };
float heat[3] = { NAN, NAN, NAN };
bool led_state;
String header;
WiFiServer server(80);
DHT dht(TEMP_SENS_PIN, DHTTYPE);
const uint8_t degree_sign[8] = { B00010, B00101, B00010, B00000, B00000, B00000, B00000, B00000 };
uint8_t add_summertime = 0;
bool last_reset_ap_check = false;
//bool minmax_enabled = false;
char date_string_old[9];
char uptime_string[23];
enum {
ACT,
MIN,
MAX
};
void ConfigAPWeb(void);
void ConfigAPStarted(WiFiManager* wm);
void setup()
{
bool ap_reset_last_state;
esp_task_wdt_init(WDT_TIMEOUT, true);
watchdog_reset();
esp_task_wdt_add(NULL);
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>"));
delay(200);
ap_reset_last_state = digitalRead(AP_DATA_RESET_PIN);
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"));
if (digitalRead(AP_DATA_RESET_PIN) == HIGH && ap_reset_last_state == HIGH)
{
ap_data_reset();
}
WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP
WiFiManager wm;
lcd.setCursor(0, 2);
lcd.print(F("Connecting WiFi... "));
wm.setWebServerCallback(ConfigAPWeb);
wm.setAPCallback(ConfigAPStarted);
wm.setConnectTimeout(WIFI_CONNECT_TIMEOUT);
wm.setConfigPortalTimeout(CFG_PORTAL_TIMEOUT);
wm.setBreakAfterConfig(true);
wm.setRemoveDuplicateAPs(true);
wm.setWiFiAutoReconnect(false);
wm.setEnableConfigPortal(false);
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(7, 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.setCursor(0, 2);
lcd.print(F("Mode WiFi client"));
lcd.setCursor(0, 3);
lcd.print(WiFi.localIP());
delay(500);
}
lcd.setCursor(0, 3);
lcd.print("Getting time...");
DateTime.setTimeZone("UTC+1");
DateTime.setServer(NTP_SERVER);
DateTime.begin(NTP_TIMEOUT);
/* while (!DateTime.isTimeValid())
{
DEBUG_MSG("Failed to get time from server.\n");
DateTime.forceUpdate();
}*/
if (DateTime.isTimeValid())
{
if (is_wintertime(DateTime.getTime()) == false)
add_summertime = 1;
else
add_summertime = 0;
}
// create a degree sign
lcd.createChar(0, (uint8_t*)degree_sign);
dht.begin();
server.begin();
sched.addJob(show_temperature, KRATE_TEMP);
sched.addJob(show_time, KRATE_TIME);
sched.addJob(check_reset_ap_data, KRATE_RESET_AP_DATA);
sched.addJob(check_datetime, KRATE_CHECK_DATETIME);
sched.addJob(watchdog_reset, WDT_TIMEOUT / 10);
get_sensor_data();
temp[MIN] = temp[ACT];
temp[MAX] = temp[ACT];
hum[MIN] = hum[ACT];
hum[MAX] = hum[ACT];
heat[MIN] = heat[ACT];
heat[MAX] = heat[ACT];
strcpy(date_string_old, "--:--:----");
watchdog_reset();
setup_screen();
show_time();
show_temperature();
}
void loop()
{
static uint32_t next_time_check;
sched.scheduler();
if (!DateTime.isTimeValid() && millis() - 10000 > next_time_check)
{
next_time_check = millis();
DateTime.setTimeZone("UTC+1");
DateTime.forceUpdate();
if (is_wintertime(DateTime.getTime()) == false)
add_summertime = 1;
else
add_summertime = 0;
}
WiFiClient client = server.available(); // Listen for incoming clients
if (client) { // If a new client connects,
DEBUG_MSG("New Client.\n"); // 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>");
client.println("<html>");
client.println("<head>");
client.println("<title>Temperatur</title>");
client.print("<meta http-equiv=\"refresh\" content=\"");
client.print(HTML_RELOAD_PAGE_SECS, DEC);
client.println("\"/>");
client.println("<meta http-equiv=\"cache-control\" content=\"no-cache\"/>");
client.println("<meta name=\"robots\" content=\"noindex\"/>");
client.println("</head>");
client.println("<body>");
client.println("<center>");
client.println("<h1 style=\"color:green;\">Temperatur</h1>");
client.print("<h2 style=\"color:green;\">Aktuell: ");
if (!isnan(temp[ACT]))
client.print(temp[ACT]);
else
client.print("--.--");
client.println(" &deg;C</h2>");
if (millis() > FIRST_MIN_MAX)
{
client.print("<h2 style=\"color:green;\">Minimum: ");
if (!isnan(temp[MIN]))
client.print(temp[MIN]);
else
client.print("--.--");
client.print(" &deg;C");
client.print("</h2>\n");
client.print("<h2 style=\"color:green;\">Maximum: ");
if (!isnan(temp[MAX]))
client.print(temp[MAX]);
else
client.print("--.--");
client.print(" &deg;C");
client.println("</h2>");
}
client.println("<hr>");
client.println("<h1 style=\"color:red;\">Gef&uuml;hlte Temperatur</h1>");
client.print("<h2 style=\"color:red;\">Aktuell: ");
if (!isnan(heat[ACT]))
client.print(heat[ACT]);
else
client.print("--.--");
client.println(" &deg;C</h2>");
if (millis() > FIRST_MIN_MAX)
{
client.print("<h2 style=\"color:red;\">Minimum: ");
if (!isnan(heat[MIN]))
client.print(heat[MIN]);
else
client.print("--.--");
client.print(" &deg;C");
client.println("</h2>");
client.print("<h2 style=\"color:red;\">Maximum: ");
if (!isnan(heat[MAX]))
client.print(heat[MAX]);
else
client.print("--.--");
client.print(" &deg;C");
client.println("</h2>");
}
client.println("<hr>");
client.println("<h1 style=\"color:blue;\">Luftfeuchtigkeit</h1>");
client.print("<h2 style=\"color:blue;\">Aktuell: ");
if (!isnan(hum[ACT]))
client.print(hum[ACT]);
else
client.print("--.--");
client.println(" %</h2>");
if (millis() > FIRST_MIN_MAX)
{
client.print("<h2 style=\"color:blue;\">Minimum: ");
if (!isnan(hum[MIN]))
client.print(hum[MIN]);
else
client.print("--.--");
client.print(" %");
client.println("</h2>");
client.print("<h2 style=\"color:blue;\">Maximum: ");
if (!isnan(hum[MAX]))
client.print(hum[MAX]);
else
client.print("--.--");
client.print(" %");
client.println("</h2>");
}
if (DateTime.isTimeValid())
{
DateTimeParts p = DateTime.getParts();
char dt[21];
if (is_wintertime(DateTime.getTime()) == false)
add_summertime = 1;
else
add_summertime = 0;
client.println("<hr>");
client.print("<h4 style=\"color:black;\">");
sprintf(dt, "%02d.%02d.%4d %02d:%02d:%02d", p.getMonthDay(), p.getMonth() + 1, p.getYear(), p.getHours() + add_summertime, p.getMinutes(), p.getSeconds());
client.print(dt);
if (add_summertime > 0)
client.print(" Sommerzeit");
else
client.print(" Winterzeit");
client.println("</h4>");
}
client.print("<h5 style=\"color:black;\">");
client.print(uptime_string);
client.println("</h5>");
client.println("</center>");
client.println("</body>");
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>Authentification 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();
DEBUG_MSG("Client disconnected.\n\n");
}
}
void check_reset_ap_data(void)
{
if (digitalRead(AP_DATA_RESET_PIN) == HIGH && last_reset_ap_check == true)
{
ap_data_reset();
}
else if (digitalRead(AP_DATA_RESET_PIN) == HIGH)
{
if (digitalRead(AP_DATA_RESET_PIN) == HIGH)
DEBUG_MSG("Reset AP data pressed\n");
last_reset_ap_check = true;
}
else
last_reset_ap_check = false;
}
void show_time(void)
{
char date_string[11];
char time_string[9];
uptime::calculateUptime();
if (DateTime.isTimeValid())
{
DateTimeParts p = DateTime.getParts();
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(date_string, "%02d.%02d.%4d", p.getMonthDay(), p.getMonth() + 1, p.getYear());
sprintf(time_string, "%02d:%02d:%02d", p.getHours() + add_summertime, p.getMinutes(), p.getSeconds());
sprintf(uptime_string, "Uptime: %4dd %02d:%02d:%02d", uptime::getDays(), uptime::getHours(), uptime::getMinutes(), uptime::getSeconds());
DEBUG_MSG("%s %s", date_string, time_string);
if (add_summertime > 0)
DEBUG_MSG(" Summertime\n");
else
DEBUG_MSG(" Wintertime\n");
DEBUG_MSG("%s\n", uptime_string);
}
else
{
strcpy(date_string, "--:--:----");
strcpy(time_string, "--:--:--");
}
if (strcmp(date_string, date_string_old))
{
lcd.setCursor(0, 0);
lcd.print(date_string);
strcpy(date_string_old, date_string);
}
lcd.setCursor(12, 0);
lcd.print(time_string);
if (uptime::getDays() >= RESET_AFTER_DAYS)
{
lcd.clear();
lcd.print("Automatic restart");
DEBUG_MSG("Automatic restart\n");
delay(2000);
ESP.restart();
}
digitalWrite(ONBOARD_LED, led_state);
led_state = !led_state;
}
void show_temperature(void)
{
get_sensor_data();
DEBUG_MSG("Temperature: %02.2f\n", temp[ACT]);
lcd.setCursor(14, 1);
if (isnan(temp[ACT]))
lcd.print("--.-");
else
lcd.print(round_float(temp[ACT], 1), 1);
if (millis() > FIRST_MIN_MAX)
{
lcd.setCursor(5, 2);
if (isnan(temp[MIN]))
lcd.print("--.-");
else
lcd.print(round_float(temp[MIN], 1), 1);
lcd.setCursor(16, 2);
if (isnan(temp[MAX]))
lcd.print("--.-");
else
lcd.print(round_float(temp[MAX], 1), 1);
}
lcd.setCursor(5, 3);
if (isnan(hum[ACT]))
lcd.print("--.-");
else
lcd.print(round_float(hum[ACT], 1), 1);
lcd.setCursor(16, 3);
if (isnan(heat[ACT]))
lcd.print("--.-");
else
lcd.print(round_float(heat[ACT], 1), 1);
}
void setup_screen(void)
{
lcd.clear();
lcd.setCursor(0, 1);
lcd.print("Temperatur:");
lcd.setCursor(18, 1);
lcd.write(0);
lcd.print("C");
lcd.setCursor(0, 2);
lcd.print("Min: --.- Max: --.-");
lcd.setCursor(0, 3);
lcd.print("LF: % GT:");
}
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);
}
void get_sensor_data(void)
{
temp[ACT] = dht.readTemperature();
hum[ACT] = dht.readHumidity();
if (!isnan(temp[ACT]) && !isnan(hum[ACT]))
heat[ACT] = dht.computeHeatIndex(temp[ACT], hum[ACT], false);
else
heat[ACT] = NAN;
/*
if (minmax_enabled == false && millis() > FIRST_MIN_MAX)
minmax_enabled = true;
if (minmax_enabled == false)
{
if (!isnan(temp[ACT]))
{
temp[MIN] = temp[ACT];
temp[MAX] = temp[ACT];
}
if (!isnan(hum[ACT]))
{
hum[MIN] = hum[ACT];
hum[MAX] = hum[ACT];
}
if (!isnan(heat[ACT]))
{
heat[MIN] = heat[ACT];
heat[MIN] = heat[ACT];
}
}
else
{
*/
if (!isnan(temp[ACT]))
{
if (isnan(temp[MIN]))
temp[MIN] = temp[ACT];
if (isnan(temp[MAX]))
temp[MAX] = temp[ACT];
if (temp[ACT] < temp[MIN])
temp[MIN] = temp[ACT];
else if (temp[ACT] > temp[MAX])
temp[MAX] = temp[ACT];
}
if (!isnan(hum[ACT]))
{
if (isnan(hum[MIN]))
hum[MIN] = hum[ACT];
if (isnan(hum[MAX]))
hum[MAX] = hum[ACT];
if (hum[ACT] < hum[MIN])
hum[MIN] = hum[ACT];
else if (hum[ACT] > hum[MAX])
hum[MAX] = hum[ACT];
}
if (!isnan(heat[ACT]))
{
if (isnan(heat[MIN]))
heat[MIN] = heat[ACT];
if (isnan(heat[MAX]))
heat[MAX] = heat[ACT];
if (heat[ACT] < heat[MIN])
heat[MIN] = heat[ACT];
else if (heat[ACT] > heat[MAX])
heat[MAX] = heat[ACT];
}
//}
}
void ConfigAPWeb(void)
{
lcd.setCursor(0, 2);
lcd.print(F("Mode Config-AP "));
lcd.setCursor(0, 3);
lcd.print(F("192.168.4.1"));
}
void ConfigAPStarted(WiFiManager * wm)
{
DEBUG_MSG("Config-AP started\n");
}
float round_float(float num, uint8_t dec_place)
{
return ((round(num * powf(10, dec_place))) / powf(10, dec_place));
}
void ap_data_reset(void)
{
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();
}
void check_datetime(void)
{
if (!DateTime.isTimeValid())
{
lcd.setCursor(0, 0);
lcd.print(" Time update ");
DateTime.forceUpdate();
show_time();
}
}
void watchdog_reset(void)
{
esp_task_wdt_reset();
}