MicroPython Forum (Archive)

I tried doubling the SPI frequency but it didn't seem to make any noticeable difference.

I also tried the same code with the SRF005 ultrasonic sensor and it was slightly more accurate, especially at distances up to 10cm where it was only around 3% short. At 30cm, accuracy went down to about 90%.

Yes, dual power supply 5v->sensor 3.3v->micro:bit

Actually, I just tried the same setup with pxt.microbit.org and the readings obtained using the Sonar package are underestimated by about 50%!

fizban I tried it with an HC-SR04 and it works but I'd say it was undermeasuring by around 10%. Using the same module with a Picaxe microprocessor, the results (between 1cm and 1.5m) were accurate to around 1% I'd say. PS There are typos in your example scripts on GitHub. In the library you have: de...

Thank you deshipu. I have updated the blog post to incorporate your helpful suggestion.

Good point. I've updated post #1 with the URL of the article.

In case anybody finds it useful, I have written a guide to using APA102 devices (including DotStar, Blinkt etc.) with MicroPython on the micro:bit on http://www.smythe-consulting.com/2017/0 ... -with.html.

Yes, good suggestion. Instead of this: for y, line in enumerate(image): for x in range(8): if line & (1 << x): display.pixel(x, y, 1) display.show() I did this for y, line in enumerate(image): for x in range(8): if line & (1 << x): display.pixel(y, x, 1) display.show() and it is now the same orienta...

deshipu Your driver works great but, compared with other drivers/code examples, the rows and columns are transposed. Most other examples are oriented with the Adafruit logo at the bottom and the pins at the top. My smiley face example has the Adafruit logo on the right and the pins on the left. Here...

Thanks again deshipu. I'm gradually getting the hang of Python "arrays". Sorry I was slow to say "thank you" - I didn't notice that you had replied.