RGB 7 Segment display using Neo pixel led

Details

Hi guys, today we are going to discuss, interfacing of neo pixel led through Nodemcu (ESP8266-12E). Neo pixel is addressable led; we can program to display any number/name in any color using microcontroller. Neo pixel came in different smd packages, here we are using Ws2812b-5050 mini RGB.

This mini led has voltage ratings: 3.0v to 5.5volts @16mA (for each Led). Our Nodemcu has 3.3-volt regulator, to drive all the Led’s properly.

Making 7 segment display using neo pixel led:

Step 1:

Here, I do all the power connections in parallel and all the Data connection in series. Using the 7-segment display method, and connect all the Led’s in proper format (As in diagram).

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More Projects:

1) 8X8 RGB Neo pixel Matrix using ws2812 led

2) 100W audio amplifier using Tda7294

3) Make your own Arduino Nano compatible board

Think you enjoy my work, stay tuned. Follow us on Instagram (sagar_saini_7294) and hackaday.

Step 2:

Each of the segment has 2 Led’s and One whole panel has 14 Led’s in total. We need 4 panels to display time (2 for Hours, 2 for minutes) for the future Clock project. Two more panels can be connected, to display seconds/any other values like Temperature.

Always connect Dout of first panel to Din of second.

Step 3:

Now, Turn Your schematics into PCB and arrange the Led’s in the format of general 7 segment display. Here you can get an example of this.

Step 4:

Making a beautiful looking PCB is equally important. So, I designed the PCB, started with a rectangular board outline then adding different type of board cut-out to PCB. Finally, this image may show my work to you.

Step 5:

Make connection of all the nets and tracks, build the copper area using GND connections for top and bottom layer. Connections can be done using Auto route/ EasyEDA is the best software for this type of work. And JLCPCB is the best PCB manufacturer for low cost and quality.

Circuit Diagram:

Connection with Nodemcu:

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PCB and Circuit Download:

Download all the important files from here.

Testing with different examples:

1) Counter:

Up-down counter is there in the code, We can change the counting 0 to 999 and delay between each count.
/disp_CountUP(500, 450); // Count numbers in Ascending order (NUMBER, DelayTime) // disp_CountDOWN(500, 250); // Count numbers in Descending order (NUMBER, DelayTime)

2) To display Numbers:

Numbers displayed on each segment are of same color at a time. In the code color can be changed using the function.

RGB:

Red(brightness,0,0)...
Read more »

Files