{"id":340,"date":"2013-03-31T18:49:10","date_gmt":"2013-03-31T16:49:10","guid":{"rendered":"http:\/\/eiseler.synology.me\/wordpress\/?p=340"},"modified":"2017-05-18T13:07:05","modified_gmt":"2017-05-18T11:07:05","slug":"easy-arduino-led-clock","status":"publish","type":"post","link":"http:\/\/eiseler.de\/wordpress\/?p=340","title":{"rendered":"Easy Arduino LED Clock"},"content":{"rendered":"
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Arduino Clock in Fischertechnik<\/p><\/div>\n

How to build an easy arduino clock. Why building a clock, since one can buy all kind of clocks? Two causes, first for the fun of it and second I can build the functions as I like and how they work. I also plan to add more functions from time to time.I wrote easy, that means not doing too much on the hardwork side. One can get an 8 7-segment LED (TM1638 LED Display Modules<\/a>) with electronics, so there are only 5 wires needed for the display (and there are added 8 buttons).  5 more wires for the real time<\/a> clock and off we go.<\/p>\n

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Another clock, with servo.<\/p><\/div>\n

Wiring is an easy job, it’s explained in the source code. I implemented only settings for hour and minute (changing minutes also resets seconds), as I think it’s easier to set the date once with the arduino IDE. But feel free to add the extra functions.<\/p>\n

I plan to add functions for servos and others for alarm and count down timer.<\/p>\n

Here are the links which will help you: TM1638<\/a>, Library DS1302<\/a><\/p>\n

And here is the code:<\/p>\n

\/*\r\n Clock Program 2014\r\n by Johannes Eiseler eiseler.synology.me\/wordpress\r\n given to public domain\r\n\r\nshows time and date on a TM1638\r\n\r\nuse buttons for brightness, and setting hour and minute\r\n\/\/ feel free for using it setting the date\r\n\/\/ use the leds too\r\n\r\n\r\nuses this libraries:\r\n#include <TM1638.h>\r\n#include <DS1302.h>\r\n \r\n#include "Timer.h" \/\/ Use a timer\r\n\r\n\r\n *\/\r\n \r\n \r\n#include <TM1638.h>\r\n#include <DS1302.h>\r\n\r\n#include "Timer.h" \/\/ To do it with a timer\r\n\r\n \r\n\/\/ define a module on data pin 8, clock pin 9 and strobe pin 7\r\n\/\/ am stecker: rot ist plus; dann in der reihenfolge: Vcc, Gnd, CLK, DIO, STB0\r\n\/\/TM1638 module(8, 9, 7); \/\/ data, clk, strobe\r\n\r\nTM1638 module(8, 7, 9); \/\/ data, clk, strobe -> this is easer for wiring\r\n \r\n\/\/ Init the DS1302\r\nDS1302 rtc(2, 3, 4);\r\n \r\n\/\/ DS1302: CE pin -> Arduino Digital 2 RST\r\n\/\/ I\/O pin -> Arduino Digital 3 DAT\r\n\/\/ SCLK pin -> Arduino Digital 4 CLK\r\n\/\/ VCC, GND, CLK, DAT, RST\r\n \r\nTime time;\r\nunsigned long timenumber;\r\nString mystring = String(8);\r\nint ss, ss1, dir;\r\nint hh, mm;\r\nbyte bright = 3;\r\n \r\nTimer timer;\r\nbyte mybyte;\r\n\/\/ Status 0=zeit anzeigen\r\n\/\/ --- erstmal nichteinstellen 1=Jahr, 2=Mon, 3=Tag, 4=DayOfWeek, 5=hh, 6=min, \r\n\/\/ einstellen 1=HH, 2=Min, 3=Sec \r\nint status = 0;\r\n \r\n\/\/Servos\r\n \r\nvoid setup() {\r\n\r\n\/\/ Serial.begin(9600);\r\n \r\n \/\/ Set the clock to run-mode, and disable the write protection\r\n rtc.halt(false);\r\n rtc.writeProtect(false);\r\n\r\n\r\n \/\/#################################\r\n\r\n \/\/ The following lines can be commented out to use the values already stored in the DS1302\r\n \/\/ but comment in the first run\r\n \/*\r\n rtc.setDOW(THURSDAY); \/\/ Set Day-of-Week to ....\r\n rtc.setTime(14, 40, 0); \/\/ Set the time to 12:00:00 (24hr format)\r\n rtc.setDate(25, 8, 2016); \/\/ Set the date to August 8th, 2016\r\n*\/\r\n\r\n \/\/#################################\r\n\r\n \r\n \/\/ display a hexadecimal number and set the left 4 dots\r\n module.setDisplayToHexNumber(0x1234ABCD, 0xF0); \/\/Test\r\n module.setupDisplay(true, 1);\r\n \r\n \/\/Serial.begin(9600);\r\n \r\n timenumber = 123456;\r\n \/\/Serial.begin(9600); \/\/ zum debuggen\r\n mybyte = 1;\r\n \/\/ Uhrzeit im RTC-Chip setzen nur einmal\r\n \/\/RTC.setTime(&time);\r\n \r\n ss= 0;\r\n ss1=0;\r\n dir = 0; \/\/ Lauflicht Richtung\r\n \r\n \r\n timer.every(125, doTick);\r\n \r\n}\r\n \r\nvoid loop() {\r\n \r\n timer.update();\r\n \r\n byte keys = module.getButtons();\r\n \r\n switch(keys){\r\n case 0b0000001: \/\/leftmost button\r\n bright++; \r\n if (bright >8) bright = 0;\r\n module.setupDisplay(true, bright);\r\n \/\/module.setLEDs(0b10101010 & 0x00FF);\r\n module.setLEDs(bright & 0x00FF);\r\n delay(500);\r\n \r\n break;\r\n case 0b0000010: \/\/leftmost + 1button Start setting\r\n status ++;\r\n if (status == 3) status = 0;\r\n delay(500);\r\n break;\r\n case 0b0000100: \/\/leftmost + 2button plus hh oder min\r\n if (status == 1) {\r\n hh++;\r\n if (hh >= 24) hh = 0;\r\n rtc.setTime(hh, mm, 0);\r\n }\r\n if (status == 2) {\r\n mm++;\r\n if (mm >= 60) mm = 0;\r\n rtc.setTime(hh, mm, 0);\r\n }\r\n delay(250);\r\n break;\r\n case 0b0001000: \/\/leftmost + 3button minus hh oder min\r\n if (status == 1) {\r\n hh--;\r\n if (hh < 0) hh = 23;\r\n rtc.setTime(hh, mm, 0);\r\n }\r\n if (status == 2) {\r\n mm--;\r\n if (mm < 0) mm = 59;\r\n rtc.setTime(hh, mm, 0);\r\n }\r\n delay(250);\r\n break;\r\n }\r\n \r\n delay(10);\r\n \r\n}\r\n \r\nvoid doTick(){\r\n \r\n \/\/ light the first 4 red LEDs and the last 4 green LEDs as the buttons are pressed\r\n \/\/ module.setLEDs(((keys & 0xF0) << 8) | (keys & 0xF));\r\n \/\/ hin und her lauflicht\r\n if (status < 1) {\r\n if (dir == 0) mybyte = mybyte << 1;\r\n else mybyte = mybyte >> 1;\r\n module.setLEDs(mybyte & 0x00FF);\r\n if (mybyte == 1) dir =0;\r\n if (mybyte ==128) dir = 1;\r\n } \r\n else {\r\n \/\/module.setLEDs(0b11111111 & 0xFF00); \r\n module.setLEDs(0xFF00); \/\/alle rot\r\n \/\/module.setLEDs(0x00FF); \/\/alle gr\u00fcn \r\n }\r\n \/\/ ende lauflicht\r\n \r\n \/\/RTC.getTime(&time);\r\n time = rtc.getTime();\r\n \r\n \/\/Serial.println(time.sec);\r\n\r\n\r\n\/\/ my rtc seems to be buggy, so next lines to clean\r\n if (time.sec == 0 && time.min == 0 && time.hour == 0) { delay(10); time = rtc.getTime(); };\r\n if (time.sec == 0 && time.min == 0 && time.hour == 0) { delay(10); time = rtc.getTime(); };\r\n if (time.sec == 0 && time.min == 0 && time.hour == 0) { delay(10); time = rtc.getTime(); };\r\nif (time.sec == 0 && time.min == 0 && time.hour == 0) return;\r\n\r\n \r\n \/\/ss1 = time.getSecond();\r\n ss1 = time.sec;\r\n \r\n if (status < 1) {\r\n if (ss1 != ss){ \/\/do nothing if the seconds didn't change since last display \r\n word decpoints = 0b00000000;\r\n \r\n if ((ss1 >= 20 && ss1 < 24) || (ss1 >= 40 && ss1 < 44)){\r\n mystring ="";\r\n int dd = time.date;\r\n if (dd < 10) mystring = mystring +" ";\r\n mystring = mystring + String(dd);\r\n int mo = time.mon;\r\n if (mo < 10) mystring = mystring +"0";\r\n mystring = mystring + String(mo);\r\n int yy = time.year;\r\n mystring = mystring + String(yy);\r\n decpoints = 0b01010000;\r\n \/\/if (ss1 < 26) servo1.write(45);\r\n \/\/if (ss1 > 39) servo1.write(135);\r\n \r\n }\r\n else {\r\n \r\n ss = ss1;\r\n \/\/timenumber = time.getHour() * 1000;\r\n timenumber = time.hour * 1000;\r\n mystring = "";\r\n hh = time.hour;\r\n if (hh < 10) mystring = mystring +" ";\r\n mystring = mystring + String(hh);\r\n mystring = mystring +" ";\r\n mm = time.min;\r\n if (mm < 10) mystring = mystring +"0";\r\n mystring = mystring + String(mm);\r\n mystring = mystring +" ";\r\n \/\/ss = time.getSecond();\r\n if (ss < 10) mystring = mystring +"0";\r\n mystring = mystring + String(ss);\r\n }\r\n \r\n module.setDisplayToString(mystring,decpoints);\r\n }\r\n }\r\n else \/\/button to set the time\r\n {\r\n hh = time.hour;\r\n mm = time.min;\r\n \r\n switch(status) {\r\n case 1: \r\n mystring = "Hour" + String(hh) + " ";\r\n module.setDisplayToString(mystring,0);\r\n break;\r\n case 2: \r\n mystring = "Min " + String(mm) + " ";\r\n module.setDisplayToString(mystring,0);\r\n break;\r\n }\r\n }\r\n \r\n}\r\n\r\n<\/pre>\n
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