The 600W Wake-Up Light with Temperature Logger
The 600W Wake-Up Light with Temperature Logger

This here is a highly advanced 24h temperature logger which registers the temperature every 15 seconds and than averages it over 1min and 12mins. The 12min averaged value is plotted on the timeline on a 128x64 OLED screen. The 1min average is printed on the bottom right corner of the screen.

The device has a real time clock and shows the time on the bottom left corner of the screen. According the latitude and longitude, the device calculates sunset and plots it on bottom center of the screen.

The user can set a wake-up time at which the device starts to slowly turn on lightbulbs on it. This happens only if the real sunset is later than or less than 30 minutes earlier than the set wake-up time.

The Arduino Code for the device is given in Step 3. It provides a lot of options to tune the device for your needs.

The video is showing the device while booting up and testing the lights. In the morning, the total light-up sequence takes 30 minutes.


  • An Arduino board (I use a Nano)
  • 128x64 SSD1306 OLED display for Arduino
  • DS3231 real time clock for Arduino
  • An 8 output relay board for Arduino
  • DHT22 temperature sensor for Arduino
  • 9V 0.5A adapter for Arduino
  • Lm7805 regulator
  • An IKEA Pluggis box
  • 8 light bulbs and their sockets
  • Some jumper cables
  • Some power cables
  • A PC with USB
  • Basic knowledge and grit to program Arduino and tackle problems

    Step 1: Connect your interfaces to Arduino

    The 600W Wake-Up Light with Temperature Logger
    The 600W Wake-Up Light with Temperature Logger

    First connect your temperature sensor, real-time clock, OLED display and relay board to Arduino. Follow the schematics for this.

    Step 2: Prepare Arduino UNO Compiler

    Find the following libraries for your Arduino online:

  • Adafruit_SSD1306 - for OLED screen
  • Adafruit_GFX_Library_master - for OLED screen
  • U8glib - for graphics
  • DHTlib - for temp sensor
  • RTClib - for RTC

    Step 3: Program Your Arduino

    Program the Arduino with this beautiful code I have written for this project. I know it's a mess but it works great and I'm not a programmer.

    // Hardware Setup
    #include #include "U8glib.h" #include #include #include #include #include #include U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NO_ACK); // Display which does not send ACK dht DHT; RTC_DS3231 RTC; #define DHT22_PIN 11 #define SQW_FREQ DS3231_SQW_FREQ_1 // Output pins const int ledPin = 13; // pin that the LED is attached to const int L1 = 7; // pins for wakeup lights const int L2 = 9; const int L3 = 10; const int L4 = 6; const int L5 = 8; const int L6 = 3; const int L7 = 2; const int L8 = 4; // Arduino Master setup void setup(void) { pinMode(ledPin, OUTPUT); pinMode(L1, OUTPUT); pinMode(L2, OUTPUT); pinMode(L3, OUTPUT); pinMode(L4, OUTPUT); pinMode(L5, OUTPUT); pinMode(L6, OUTPUT); pinMode(L7, OUTPUT); pinMode(L8, OUTPUT); Wire.begin(); RTC.begin(); // set font for the console window u8g.setFont(u8g_font_7x14); // set upper left position for the string draw procedure u8g.setFontPosTop(); clear_screen(); // clear screen Serial.begin(9600); //------------------------------ // The main loop runs once every 15 seconds. To adjust the timing, there is a parameter called loopdelay. // This device is around 14.5 seconds and is finetuned everyday according to the real time clock. // (see timeatend parameter at the end of the code) if ( == 0) EEPROM.write(255,200); } int short loopdelay =; //------------------------------ DateTime now; // System Variables (Do Not Touch) short Cbuffer[4]; double Clastmin; short Cclose[12]; short Cinst; short Ccloseavg; short Vtemp[120]; boolean warmup = true; short ntime = 9999; short nstart; short timeatend; short nsunrise = 7*60*4; double sun; short nwakeup; double time_offset; double eps; double eqtime; double decl; double ha; short dotweek; // User Variables (OK to touch) double Longitude = 3; double Latitude = 51; double timezone = 1; //0 when DST in Belgium, 1 when normal short demopause = 200; short nwakeupstart = (6*60+45)*4; // XY Graph Position and Size const byte originX = 2; const byte originY = 45; const byte Hpoints = 124; const byte Vpoints = 45; //Graphics parameters uint8_t line_pos = 0; #define ROW_MAX 4 #define LINE_MAX 17 #define x_MAX 127 #define y_MAX 63 uint8_t screen[ROW_MAX][LINE_MAX]; uint8_t rows, cols; #define LINE_PIXEL_HEIGHT 14 #define pi 3.141592653589793 // Function Clear Screen void clear_screen(void) { uint8_t i, j; for( i = 0; i < ROW_MAX; i++ ) for( j = 0; j < LINE_MAX; j++ ) screen[i][j] = 0; } // Draw Routine for the LCD Screen void draw(void) { // Axii u8g.drawHLine(originX, originY, Hpoints+1); u8g.drawVLine(originX, originY-Vpoints-1, Vpoints+1); // Y arrow u8g.drawVLine(originX-1, originY-Vpoints+1, 2); u8g.drawVLine(originX+1, originY-Vpoints+1, 2); u8g.drawPixel(originX-2, originY-Vpoints+2); u8g.drawPixel(originX+2, originY-Vpoints+2); // X arrow u8g.drawHLine(originX+Hpoints-2, originY-1, 2); u8g.drawHLine(originX+Hpoints-2, originY+1, 2); u8g.drawPixel(originX+Hpoints-2,originY-2); u8g.drawPixel(originX+Hpoints-2,originY+2); // Vertical Grid Points for(int i = 20; i 60) sun = sun - 24*60; // Set the ntime parameter to correct time ntime=now.hour()*60*4+now.minute()*4+((now.second()+8) / 15); nstart=ntime; } // Device is already running: else nstart > 5710) warmup = false; //Device is already running or just powered on, doesn't matter: //Read temp probe uint32_t start = micros(); int chk = DHT.read22(DHT22_PIN); uint32_t stop = micros(); switch (chk) //Print inputs from Temp probe to serial port { case DHTLIB_OK: Serial.print("OK, "); break; case DHTLIB_ERROR_CHECKSUM: Serial.print("Checksum error, "); break; case DHTLIB_ERROR_TIMEOUT: Serial.print("Time out error, "); break; default: Serial.print("Unknown error, "); break; } //Print some extra debug data to serial port Serial.print(; Serial.print('-'); Serial.print(now.month()); Serial.print('-'); Serial.print(now.year()); Serial.print(" "); Serial.print(now.hour()); Serial.print(':'); Serial.print(now.minute()); Serial.print(" "); Serial.print(ntime); Serial.print('/'); Serial.print(loopdelay); Serial.print('/'); Serial.print(nsunrise/60/4); Serial.print(':'); Serial.print((nsunrise%(60*4))/4); Serial.print(" "); Cinst = DHT.temperature * 10 - 100; // Cinst = random(50,100); //for test Serial.print((Cinst+100)); Serial.print(" => "); Cbuffer[ntime % 4] = Cinst; Clastmin = (Cbuffer[0] + Cbuffer[1] + Cbuffer[2] + Cbuffer[3])/4; Serial.print((Clastmin+100)/10,1); if (ntime % 4 == 0) { Serial.print(",\t"); Cclose[(ntime % 48) / 4] = Clastmin; } if (ntime % 48 == 24) { Ccloseavg = (Cclose[0] + Cclose[1] + Cclose[2] + Cclose[3] + Cclose[4] + Cclose[5] + Cclose[6] + Cclose[7] + Cclose[8] + Cclose[9] + Cclose[10] + Cclose[11])/12; if (warmup == true) EEPROM.write(ntime/48,0); else EEPROM.write(ntime/48,Ccloseavg); Serial.print(",\t"); Serial.print((; } // Wakeuplight! nwakeup = (((ntime-nwakeupstart)) % (24*60*4))/4; //create the if functions that turn the light on consecutively, here if (nwakeup nwakeupstart - 30*4)) { if (nwakeup > 0) digitalWrite(L1,LOW); if (nwakeup > 5) digitalWrite(L2,LOW); if (nwakeup > 10 && dotweek != 6 && dotweek != 0) digitalWrite(L3,LOW); if (nwakeup > 14 && dotweek != 6 && dotweek != 0) digitalWrite(L4,LOW); if (nwakeup > 18 && dotweek != 6 && dotweek != 0) digitalWrite(L5,LOW); if (nwakeup > 22 && dotweek != 6 && dotweek != 0) digitalWrite(L6,LOW); if (nwakeup > 25 && dotweek != 6 && dotweek != 0) digitalWrite(L7,LOW); if (nwakeup > 28 && dotweek != 6 && dotweek != 0) digitalWrite(L8,LOW); } else { digitalWrite(L1,HIGH); digitalWrite(L2,HIGH); digitalWrite(L3,HIGH); digitalWrite(L4,HIGH); digitalWrite(L5,HIGH); digitalWrite(L6,HIGH); digitalWrite(L7,HIGH); digitalWrite(L8,HIGH); } // Picture loop - to draw the stuff on the screen (done once every loop) u8g.firstPage(); do { draw(); } while( u8g.nextPage() ); // End Picture Loop //Processing ended, shut down LED Serial.println(); digitalWrite(ledPin,LOW); //At the end of day, adjust the loopdelay parameter to make sure each loop takes 15 seconds ntime++; if (ntime == 5760) { timeatend=now.minute()*60+now.second(); //include DST effect if (timeatend > 60*60) { loopdelay = loopdelay - (60*60-timeatend)/5760*1000; } else { loopdelay = loopdelay + timeatend/5760*1000; } EEPROM.write(255,loopdelay-14600); ntime=0; } delay(loopdelay); }

    Step 4: Set the real time clock

    Find a script online to set the time on your real time clock.

    Step 5: Assemble the power modules and the box

    The 600W Wake-Up Light with Temperature Logger
    The 600W Wake-Up Light with Temperature Logger
    The 600W Wake-Up Light with Temperature Logger
    The 600W Wake-Up Light with Temperature Logger
    The 600W Wake-Up Light with Temperature Logger

    Dissassemble your 9V adapter and locate it somewhere in your box. As you see, I have put it in an electric wall box. Then connect your lights, power inputs and your temperature sensor. Remember to use an LM7805 to carry power to the relay board from the 9V adapter.

    Solder 1micF by-pass capacitors to the Arduino and OLED display power inputs. The relays can create surges in power and this can affect the electronics.

    All the connections to the lights and the relays are AC powered. BE CAREFUL!! USE SEPARATE WALL BOXES AND TIDY UP YOUR AC POWER CONNECTIONS!!

    Step 6: Attach the temperature sensor

    Attach the temperature sensor to the end of a 3 wire cable and connect it to the Arduino through a hole in your box. Make sure the sensor is placed somewhere at least 1m away from the box.

    Step 7: Set your Longitude, Latitude, Wake-Up time and Lighting Sequence

    The 600W Wake-Up Light with Temperature Logger

    Do some fine tuning. Play around a little.

    Step 8: Check for safety

    Check if your box is melting. The bulbs can create a lot of heat.

    Step 9: Plug it in and enjoy!

    The 600W Wake-Up Light with Temperature Logger

    Test it a few more days while you are around and then forget about it. It will just work fine... Enjoy!


    Tag cloud

    make build easy simple arduino making homemade solar laser printed portable cheap mini building custom cardboard wooden create super lego turn paracord chocolate your paper light intel