MyRedBoard_S7S_DS1307_2MINTIMER by DrJeff

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Picture of Kids 2 min timer for brushing teeth](http://cdn.instructables.com/F6Y/LV3A/I6OXL9NF/F6YLV3AI6OXL9NF.LARGE.jpg "enter image title here") My kids always brush too fast. So I make them a clock with a button on the top which when pushed will start counting from 1s to 120s. They are now using that as their 2 minute timer. It is a pretty simple project, if you have an RTC clock and an Arduino compatible board you can get it done.  Step 1: Material Picture of Material 00097-03-L.png 11575-04.png raspberry_pi_rtc.png 1 Sparkfun Redboard (or any Arduino compatible) 1 Seven Segment Display kit 1 RTC DS1307 Clock kit (see Adafruit Tutorial on how to get or build one your self) 1 push button Some Plexiglass for overall case. I just make a box from it and glue them together. Nothing fancy. The RTC Clock is put inside an empty dental floss container so I don't have to cover or worry about short circuiting the board inside the case. Step 2: Setup your connections Picture of Setup your connections Time to get your breadboard out. I used Sparkfun tutorial here to connect the 7 segment https://learn.sparkfun.com/tutorials/using-the-ser... I am opting for the Serial UART connection. Similarly I use this Adafruit tutorial for my RTC clock connection with i2C connection https://learn.adafruit.com/ds1307-real-time-clock-... Step 3: Program MyRedBoard_S7S_DS1307_2MINTIMER.ino MyRedBoard_S7S_DS1307_2MINTIMER.ino