Search found 27 matches

by BruinBear
Wed Feb 01, 2017 10:11 pm
Forum: micro:bit boards
Topic: Adafruit 8x8 LED matrix. More compact code?
Replies: 11
Views: 4193

Adafruit 8x8 LED matrix. More compact code?

Hello I am using deshipu's driver for the HT16K33 on the Adafruit backpack for their 8x8 LED matrix. To make a smiley face, I am using the following code but I was getting a memory error when compiling. I chopped out the unused bits from deshipu's driver (which is why I added an x to the name) and t...
by BruinBear
Tue Jan 17, 2017 9:21 am
Forum: micro:bit boards
Topic: Send binary data by SPI
Replies: 9
Views: 4774

Re: Send binary data by SPI

The LEDs don't draw any current from the micro:bit. The micro:bit just sends the serial data to the two CAT4016 shift registers on the DSP-7S04 display module using SPI protocol. Each CAT4016 shift register is fitted with a current-limiting resistor.
by BruinBear
Mon Jan 16, 2017 9:24 pm
Forum: micro:bit boards
Topic: Send binary data by SPI
Replies: 9
Views: 4774

Re: Send binary data by SPI

Thanks to help from deshipu, I have got the display working fully now with the BBC micro:bit. The code below just counts up to 9999 to show the operation (including adding leading zeros for numbers with fewer than 4 digits). It's not very useful as it is, but could easily be adapted to display senso...
by BruinBear
Mon Jan 16, 2017 9:18 am
Forum: micro:bit boards
Topic: Send binary data by SPI
Replies: 9
Views: 4774

Re: Send binary data by SPI

That's great @deshipu! Thanks again. I'm learning some useful Python :)
by BruinBear
Sun Jan 15, 2017 11:23 pm
Forum: micro:bit boards
Topic: Send binary data by SPI
Replies: 9
Views: 4774

Re: Send binary data by SPI

More help needed, please! The code below sets up a bytearray containing the bit patterns for each number 0-9 (plus decimal point) to be displayed on the 4x7-seg display (LSB is sent first). I can select a contiguous range of four numbers to be displayed e.g. in the example below spi.write(buf[0:4]) ...
by BruinBear
Sat Jan 14, 2017 10:57 pm
Forum: micro:bit boards
Topic: Send binary data by SPI
Replies: 9
Views: 4774

Re: Send binary data by SPI

Thank you so much! Both methods work well on my 7-digit display. I was getting close, but couldn't quite get the syntax right.
by BruinBear
Sat Jan 14, 2017 12:09 pm
Forum: micro:bit boards
Topic: Send binary data by SPI
Replies: 9
Views: 4774

Send binary data by SPI

I am trying to use an SPI 4 x 7-seg display to a BBC micro:bit. Everything is working fine except that, as a Python newbie, I don't know how to send 32 bits of binary data. The following code passes syntax: [code] # P.0 = BLK - turn display on/off (active low) # P.1=LAT from microbit import * from m...