Pure C Arduino

I would like to share my project with you. It's an RTC clock with thermometer powered by atmega328p. Clock, displaying current time, date & day of week. It took me a while to finish this project since I wanted to polish the software. I wanted to implement a couple of features which will make my clock more interesting than any other similar device like that build before. I'll try to go through all the details now so, if you find this project interesting you can build it yourself (everything. including the software, is available for free). Hardware  The hardware itself is pretty simple. I used a ds18b20 digital One-Wire temperature sensor as a thermometer, a DS1307 RTC module which comes with a battery and a classic hd44780 LCD 16x2 display. Everything is pretty generic in that matter. There's a diode as well used to indicate that the clock is running and a couple of buttons. Besides that I use a couple of transistors in order to be able to control the LCD'...

Clock - I think that it's the most popular idea for a project with the MCU . It's not that hard from both software and hardware side to realize but not that trivial as well, not mentioning the fact that once realized it sits somewhere in the house, constantly reminding about itself and brings a kind of satisfaction :). There are a lot of options really to implement, a buzzer alarm, perhaps a thermometer, display and buttons servicing, perhaps maybe even serial port usage for NTP synchronization. But ... The most challenging thing - like in every clock is the time reference source. There are a couple of options: well calibrated frequency source acting as an interrupt source Real Time Clock module with external crystal ( < 20 ppm ) internal clock These days RTC chips are so cheap and widely available that they are really the only reasonable choice, but if we're only planning to play around a bit with the software without paying much attention to accura...