CH30-C - 7 Segment Blink

We'll connect the 7 Segment Display with a Crazy Circuits Ribbon Cable using all four wires.

Start by plugging the connector with the three wires in it (Black, Red, Yellow) into the Pin 1 row of the Bit Board. (Make sure the Black wire is in - and the Yellow wire labeled S1 is closest to the number 1 on the Bit Board.)

We can then plug the Orange wire labeled S2 into Pin 0 on the Bit Board.

Now we'll connect the other end of the Ribbon Cable to the 7 Segment Display.

The pin labels are on the back of the 7 Segment Display PCB. From top to bottom it's CLK, DIO, VCC, GND.

CLK stands for Clock and DIO stands for Data Input/Output. VCC is the Positive (+) and GND is the Ground (-) or Negative.

S2 (Orange) goes to CLK, S1 (Yellow) goes to DIO, and then + (Positive) goes to VCC and - (Ground or Negative) goes to GND.

Make sure every wire is connected in the correct place, or our display will not work!

We used a 3D printed holder we designed to hold the 7 Segment Display in place on the LEGO baseplate.

You can find the guide for the holder here: 7 Segment Display Holder

Alternately you can use some LEGO bricks and a rubber band or tape to hold the display in place.

If you've never used a micro:bit before you'll want to check out this guide: Bit Board V2 Setup and Use

We're going to load the following code for our 7 Segment Blink program: https://makecode.microbit.org/_EF2gPq514...

In the on start block we'll set up our display using the pins we've connected. CLK to Pin 0 and DIO to Pin 1.

In our forever loop we will use show number with the variable theCount, which is set to 123.

We then do a repeat loop 4 times where we turn off and then turn on the 7 Segment Display, with a short pause between each one. This will give the appearance of blinking a number.

We'll then clear the display and repeat the process.

Note that clear removes or "blanks out" whatever is being displayed while turn off maintains the number that is being displayed, but turns off the illumination while the number is still there.

Once the code is loaded it should start running immediately.

You can power the micro:bit via the USB cable you used to load the code or you can use a battery pack plugged into the Bit Board.

The display will show 0123 and then blink it on and off four times.

Follow along with our recorded Live Stream!

(We'll add the video to this step after we do the stream!)