This is a great battery-backed real time clock (RTC) that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. Perfect for datalogging, clock-building, time stamping, timers and alarms, etc. The DS1307 is the most popular RTC - but it requires 5V power to work (although we've used it with 5V power and 3.3V logic successfully) Works great with an or with a • PCB & header are included • Plugs into any breadboard, or you can use wires • Two mounting holes • Will keep time for 5 years or more Note: This product does not come with a CR1220 coin cell battery. The DS1307 is simple and inexpensive but not a high precision device. It may lose or gain up to 2 seconds a day. For a high-precision, temperature compensated alternative,.

If you do not need a DS1307, or you need a 3.3V-power/logic capable RTC please check out our affordable • Technical Details. Ordering full reels vs. Cut reels Adafruit NeoPixel Digital RGB LED strips come to us in 4 or 5 meter reels with a 2 or 3-pin JST SM connector on each end and separated power/ground wires as shown in the pic below. If you order a full 4 or 5 meters, you get the full reel with both connectors installed (like the pic below). If you buy less than a full reel, you'll get a single strip, but it will be a cut piece from a reel which may or may not have a connector on it.

Add a DS1307 RTC clock to your AVR microcontroller Bruce E. Hall, W8BH Having a real-time clock (RTC) on your microcontroller can be very handy, especially for data. DS1307 RTC at bildr Blog An I2C Bus Example Using the DS1307 Real-Time Clock DS1307. Digital Clock with Alarm Using DS1307. My background is just messing about with discrete components and circuits and decided to take a dive into programming with Arduino because of my interest in sensors. Click to expand. It doesn't work now because you are not reading the clock often enough to catch it at the alarm time (in addition to the other points already mentioned).

If the piece comes from the end of the reel, the connector may be on the output end of the strip!