![]() ![]() ![]() Where the single digit had a single +5V pin plus seven segment pins, this needs +5V on one pin and FOURTEEN pins to control each segment.įourteen pins is a lot. I’ve also chosen a common-anode version for this test, but common-cathode units are available as well. It operates just like two separate single-digit, except it’s physically a single unit. The LDD-A514RI unit features two 7-segment LED digits put together. Resistor Networks & Arrays 16pin 1Kohms Isolated Low Profile I/O Expanders, Repeaters & Hubs 16B I/O Expander I2C interface So, if your computer picks up its time from the Internet, that will be pretty accurate.Now that we can drive a single 7-segment LED, let’s try a double! It will set the RTC to the time at which the sketch was compiled and uploaded. Paste the following sketch into a new Arduino window and upload it to your board. It is a simple process, connect the part as shown in the image, the red wire connected with 5V, black wire with GND, orange to A4 (SDA – data), yellow to A5 (SCL – clock).īoth RTC and 7-segment modules have an Arduino library, as normal with libraries, unzip the folders into your Arduino ‘libraries’ directory and then restart the Arduino IDE for it to pick them up. ![]() DS1307 breakout board also comes as a kit of parts to be soldered. This module uses I2C interface, which means it needs just two data pins to control the 4 digits instead of 14 pin, freeing up Arduino pins for other usages.ĭS1307 is a battery-backed real time clock (RTC) that allows a microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. The PCB contains a driver chip with a built in clock that multiplexes the display and constant-current drivers for ultra-bright consistent color. ![]() The 7-Segment Backpack is a combination of the LED display, header pins, and a PCB which need to be soldered together. Using Adafruit’s 0.56″ 7-segment LED backpack and display and the DS1307 RTC (Real Time Clock) board, this tutorial will guide you to make a simple 4-digit clock that uses only 2 Arduino pins. ![]()
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