News:
25/11/2022  

We did!. The time display microbit ignores all radio messages that are not 4-character strings. 

You currently have to reset it to get the next message, but this could be fixed. 

We plan to fit in a small box so that it can easily be carried about. 

24/11/2022
We could connect the Sevensegment microbit to the Finish timing gate,
which could send the time (4-digits) to be displayed (with a decimal point!)
See Here for BBC Microbit Radio (examples at the bottom)
Also use the right group number:
   import radio
   radio.config(group=17)

17/11/2022:
A student has completed a microbit program to count down from 9999 on a 4-digit display.
See Here for the program



This shows the pins that we are using, and the pins that we can't use: P5,P11,P12.




The LED display is called "LD3361BS" Here is the PDF document that gives its data (on page 38).

 

This digram shows how the negative terminal (Cathode) of the same segment in each of the 4 digits are connected together .
The one(s) that light up is dependent as to whether the positive terminal (Anode) of the segment is powered up.or not.
The negative terminal of each diode to be lit must be given a zero voltage.

Note that the LEDs that light the segments only light when the electricity is flowing in the right direction!
The "D" in LED stands for Diode which is the old name for a valve with only 2 terminals (Positive and negative)

A program Here shows a 4 digit number that counts.
It uses an array to hold the segment settings for each digit, and holds these 10 arrays in another array.
This simplifies the program, but makes the data more complicated!