First commit
J. Fernando Sánchez
6 years ago
commit
1c35014641
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passwords.h
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.*
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ESP8266-based clock that uses NTP to stay in sync, and a DHT11/22 to also display the temperature and humidity.
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WORK IN PROGRESS.
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# Connections
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| ILI9341 SPI TFT | NodeMCU |
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|-----------------|---------|
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| VCC | 3.3V |
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| GND | GND |
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| CS | D2 |
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| REST | RST |
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| DC | D1 |
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| SDI/MOSI | D7 |
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| SCK | D5 |
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| LED | 3.3V |
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| SDO/MISO | D6 |
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| DHT11 | NodeMCU |
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|-------|---------|
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| VCC | 3.3V |
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| Data | D0 |
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| GND | GND |
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# Arduino ESP8266 support
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Boards manager link: http://arduino.esp8266.com/stable/package_esp8266com_index.json
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# Libraries
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Some of them are available via the Arduino library manager
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* https://github.com/PaulStoffregen/Time
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* https://github.com/JChristensen/Timezone
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* https://github.com/Bodmer/TFT_eSPI
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* https://github.com/beegee-tokyo/DHTesp
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/*
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ESP8266-based clock that uses NTP to stay in sync, and a DHT11/22
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to also display the temperature and humidity.
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| ILI9341 SPI TFT | NodeMCU |
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|-----------------|---------|
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| VCC | 3.3V |
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| GND | GND |
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| CS | D2 |
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| REST | RST |
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| DC | D1 |
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| SDI/MOSI | D7 |
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| SCK | D5 |
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| LED | 3.3V |
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| SDO/MISO | D6 |
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| DHT11 | NodeMCU |
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|-------|---------|
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| VCC | 3.3V |
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| Data | D0 |
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| GND | GND |
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Based on clock sketch by Gilchrist 6/2/2014 1.0
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A few colour codes:
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code color
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0x0000 Black
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0xFFFF White
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0xBDF7 Light Gray
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0x7BEF Dark Gray
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0xF800 Red
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0xFFE0 Yellow
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0xFBE0 Orange
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0x79E0 Brown
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0x7E0 Green
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0x7FF Cyan
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0x1F Blue
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0xF81F Pink
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*/
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#include <DHTesp.h>
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#include "passwords.h" // Define WIFI_PASS and WIFI_SSID here
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#define DHT11_PIN D0
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DHTesp dht;
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const int INTERVAL_DHT = 30;
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#include <TFT_eSPI.h> // Hardware-specific library https://github.com/Bodmer/TFT_eSPI
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#include <SPI.h>
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#include <ESP8266WiFi.h>
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#include <ESP8266WiFiMulti.h>
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#include <WiFiUdp.h>
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#include <Timezone.h> // https://github.com/JChristensen/Timezone
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// Time variables
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// Central European Time (Frankfurt, Paris)
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TimeChangeRule CEST = {"CEST", Last, Sun, Mar, 2, 120}; // Central European Summer Time
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TimeChangeRule CET = {"CET ", Last, Sun, Oct, 3, 60}; // Central European Standard Time
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Timezone CE(CEST, CET);
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TimeChangeRule *tcr;
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// Wifi variables
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bool connectionWasAlive = false;
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ESP8266WiFiMulti wifiMulti; // Create an instance of the ESP8266WiFiMulti class, called 'wifiMulti'
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WiFiUDP UDP; // Create an instance of the WiFiUDP class to send and receive
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IPAddress timeServerIP; // time.nist.gov NTP server address
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const char* NTPServerName = "hora.roa.es";
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const int NTP_PACKET_SIZE = 48; // NTP time stamp is in the first 48 bytes of the message
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byte NTPBuffer[NTP_PACKET_SIZE]; // buffer to hold incoming and outgoing packets
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unsigned long intervalNTP = 60000; // Request NTP time every minute
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unsigned long prevNTP = 0;
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unsigned long lastNTPResponse = millis();
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uint32_t timeUNIX = 0;
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// TFT variables
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#define TFT_GREY 0x5AEB
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#define TFT_DARK_GREY 0x7BEF
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TFT_eSPI tft = TFT_eSPI(); // Invoke custom library
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#define FONT_SIZE 7
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// Clock variables
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uint8_t hh = 0, mm = 0, ss = 0;
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byte omm = 99, oss = 99;
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byte xcolon = 0, xsecs = 0;
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unsigned int colour = 0;
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uint32_t targetTime = 0; // for next 1 second timeout
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// Other variables
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int counter = 0;
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void updateTime() {
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unsigned long currentMillis = millis();
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if (currentMillis - prevNTP > intervalNTP) { // If a minute has passed since last NTP request
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prevNTP = currentMillis;
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Serial.println("\r\nSending NTP request ...");
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sendNTPpacket(timeServerIP); // Send an NTP request
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}
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uint32_t time = getTime(); // Check if an NTP response has arrived and get the (UNIX) time
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if (time) { // If a new timestamp has been received
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timeUNIX = time;
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Serial.print("NTP response:\t");
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Serial.println(timeUNIX);
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lastNTPResponse = currentMillis;
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} else if ((currentMillis - lastNTPResponse) > 3600000) {
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Serial.println("More than 1 hour since last NTP response. Rebooting.");
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Serial.flush();
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ESP.reset();
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}
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time_t t = CE.toLocal(now(), &tcr);
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mm = minute(t);
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ss = second(t);
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hh = hour(t);
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if ( ss != oss ) { // If a second has passed since last print
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Serial.printf("\rLocal time:\t%d:%d:%d ", hh, omm, oss);
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}
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}
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void drawTime(){
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int xpos = 20;
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int ypos = 65; // Top left corner ot clock text, about half way down
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int ysecs = ypos + 24;
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if (omm != mm) { // Redraw hours and minutes time every minute
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omm = mm;
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// Draw hours and minutes
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if (hh < 10) xpos += tft.drawChar('0', xpos, ypos, FONT_SIZE); // Add hours leading zero for 24 hr clock
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xpos += tft.drawNumber(hh, xpos, ypos, FONT_SIZE); // Draw hours
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xcolon = xpos; // Save colon coord for later to flash on/off later
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xpos += tft.drawChar(':', xpos, ypos - 8, FONT_SIZE);
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if (mm < 10) xpos += tft.drawChar('0', xpos, ypos, FONT_SIZE); // Add minutes leading zero
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xpos += tft.drawNumber(mm, xpos, ypos, FONT_SIZE); // Draw minutes
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xsecs = xpos; // Sae seconds 'x' position for later display updates
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}
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if (oss != ss) { // Redraw seconds time every second
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oss = ss;
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xpos = xsecs;
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if (ss % 2) { // Flash the colons on/off
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tft.setTextColor(0x39C4, TFT_BLACK); // Set colour to grey to dim colon
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tft.drawChar(':', xcolon, ypos - 8, FONT_SIZE); // Hour:minute colon
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tft.setTextColor(TFT_YELLOW, TFT_BLACK); // Set colour back to yellow
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}
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else {
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tft.drawChar(':', xcolon, ypos - FONT_SIZE, FONT_SIZE); // Hour:minute colon
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}
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}
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}
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uint32_t getTime() {
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if (UDP.parsePacket() == 0) { // If there's no response (yet)
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return 0;
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}
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UDP.read(NTPBuffer, NTP_PACKET_SIZE); // read the packet into the buffer
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// Combine the 4 timestamp bytes into one 32-bit number
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uint32_t NTPTime = (NTPBuffer[40] << 24) | (NTPBuffer[41] << 16) | (NTPBuffer[42] << 8) | NTPBuffer[43];
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// Convert NTP time to a UNIX timestamp:
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// Unix time starts on Jan 1 1970. That's 2208988800 seconds in NTP time:
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const uint32_t seventyYears = 2208988800UL;
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// subtract seventy years:
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uint32_t UNIXTime = NTPTime - seventyYears;
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setTime(UNIXTime);
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return UNIXTime;
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}
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void sendNTPpacket(IPAddress& address) {
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memset(NTPBuffer, 0, NTP_PACKET_SIZE); // set all bytes in the buffer to 0
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// Initialize values needed to form NTP request
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NTPBuffer[0] = 0b11100011; // LI, Version, Mode
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// send a packet requesting a timestamp:
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UDP.beginPacket(address, 123); // NTP requests are to port 123
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UDP.write(NTPBuffer, NTP_PACKET_SIZE);
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UDP.endPacket();
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}
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inline int getSeconds(uint32_t UNIXTime) {
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return UNIXTime % 60;
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}
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inline int getMinutes(uint32_t UNIXTime) {
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return UNIXTime / 60 % 60;
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}
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inline int getHours(uint32_t UNIXTime) {
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return UNIXTime / 3600 % 24;
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}
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void monitorWiFi() {
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if (wifiMulti.run() != WL_CONNECTED)
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{
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if (connectionWasAlive)
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{
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connectionWasAlive = false;
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Serial.print("Looking for WiFi ");
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}
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Serial.print(".");
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}
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else if (connectionWasAlive == false)
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{
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connectionWasAlive = true;
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Serial.print("Connected to ");
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Serial.println(WiFi.SSID()); // Tell us what network we're connected to
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Serial.print("IP address:\t");
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Serial.print(WiFi.localIP()); // Send the IP address of the ESP8266 to the computer
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Serial.println("\r\n");
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}
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}
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void startWiFi() { // Try to connect to some given access points. Then wait for a connection
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wifiMulti.addAP(WIFI_SSID, WIFI_PASS); // add Wi-Fi networks you want to connect to
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while (wifiMulti.run() != WL_CONNECTED) { // Wait for the Wi-Fi to connect
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delay(250);
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monitorWiFi();
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}
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Serial.println("\r\n");
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}
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void startUDP() {
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Serial.println("Starting UDP");
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UDP.begin(123); // Start listening for UDP messages on port 123
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Serial.print("Local port:\t");
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Serial.println(UDP.localPort());
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Serial.println();
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}
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void printTemperature()
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{
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float humidity = dht.getHumidity();
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float temperature = dht.getTemperature();
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Serial.print(dht.getStatusString());
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Serial.print("\t");
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Serial.print(humidity, 1);
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Serial.print("\t\t");
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Serial.print(temperature, 1);
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Serial.print("\t\t");
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Serial.print(dht.computeHeatIndex(temperature, humidity, false), 1);
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Serial.print("\t\t");
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Serial.println(dht.computeHeatIndex(dht.toFahrenheit(temperature), humidity, true), 1);
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int space = 16;
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int pos = 24;
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int font = 4;
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int posy = 180;
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tft.setTextSize(1);
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tft.setTextColor(TFT_DARK_GREY, TFT_BLACK);
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pos += tft.drawString("T: ", pos, posy+20, font);
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pos += tft.drawNumber(temperature, pos+space, posy, 7) + 2*space;
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pos += tft.drawString("C", pos, posy, font) + space;
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pos += tft.drawString("H: ", pos, posy+20, font);
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pos += tft.drawNumber(humidity, pos + space, posy, 7);
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pos += tft.drawChar('%', pos + space, posy, font);
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tft.setTextColor(TFT_YELLOW, TFT_BLACK);
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tft.setTextSize(2);
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}
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void setup(void) {
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dht.setup(DHT11_PIN, DHTesp::DHT11); // Connect DHT sensor to GPIO 17
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tft.init();
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tft.setRotation(1);
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tft.fillScreen(TFT_BLACK);
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tft.setTextSize(2);
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tft.setTextColor(TFT_YELLOW, TFT_BLACK);
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targetTime = millis() + 1000;
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Serial.begin(115200); // Start the Serial communication to send messages to the computer
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delay(10);
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Serial.println("\r\n");
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startWiFi(); // Try to connect to some given access points. Then wait for a connection
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startUDP();
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if(!WiFi.hostByName(NTPServerName, timeServerIP)) { // Get the IP address of the NTP server
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Serial.println("DNS lookup failed. Rebooting.");
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Serial.flush();
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ESP.reset();
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}
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Serial.print("Time server IP:\t");
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Serial.println(timeServerIP);
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Serial.println("\r\nSending NTP request ...");
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sendNTPpacket(timeServerIP);
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}
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void loop() {
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if (targetTime < millis()) {
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targetTime = millis() + 1000;
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monitorWiFi();
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if ( (counter % INTERVAL_DHT) == 0){
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counter = 0;
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printTemperature();
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}
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counter = counter+1;
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updateTime();
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// Update digital time
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drawTime();
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}
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}
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