![]() If(now hour=off hour&now minute=off minute&now second=off second) If(now hour=on hour &now minute=on minute & now second=on second) One of the challenges here is to compare the "on time" and "off time" with the current time at every moment. The RTC and LCD libraries used in this tutorial: You can check your values with the eeprom_read code. Upload the code and wait for the pin 13 led to turn on. The eeprom library is already included on your arduino IDE. EEPROM clear Commonly ,eeprom values are 255 x address and we need to set these values to 0. If you don't know, the lcd and the rtc can be connected at the same time to the I2C bus (analog 4 SDA, analog 5 SCL). Then open up the Serial monitor window to show that the time has been set. Warning !:If you compile and then upload later, the clock will be off by that amount of time. Then you must press the Upload button to compile and then immediately upload. If your computer time is not set right you should fix that first. This sketch take the Date and Time according the computer you're using (right when you compile the code) and uses that to program the RTC. Add the RTClib-master to your Arduino library. RTC We'll use the RTC 3231, but the rigth time must be programmed. Replace the address if it's not the same (0x3F) in the codes of the next steps. Upload the code and open the serial monitor, the address will be displayed. If you don't know your address, use the utility "I2C scanner". LiquidCrystal_I2C lcd(0x3F,16,2) //0x3F is my lcd address, maybe not yours! LCD The lcd must have an address, declared at the beginning of the code: We'll start from the basic timer to the more complete one.With this timer you can even turn on something for a second!įirst of all, we need to set up the LCD,RTC and clear the arduinos eeprom. The code was made to activate the relay at any moment. These timers can recover the data and work even in case of power failure. ![]() Useful if you want to save money or don't need to chage the settings periodically. Save data on the eeprom.Īll timers has a "simple" version, that means, without lcd interface. If you want to learn how this interface was made, please visit:Īll timers are hours,minutes and seconds (on/off) programmables. I tried to make this project compact, easy to use and set up, with 3 buttons and a 16x2 lcd.The interface is based on my previous instructable "Turn single screen into multiple screens". ![]() so i decided to bring an old code, made with PIC, to arduino, easier to share and make. Hi! "Arduino Timer with on/off setpoint" is my most viewed instructable by far, so i got a lot of questions in the comments, inbox and youtube, about how to add minutes,seconds, days and save settings on the eeprom. ![]()
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