When I original wrote the clock’s firmware, it took about 7 seconds to generate a QR code. Of course, this was without refreshing the display. The display needs to be refreshed at least two dozen times a second, and these interruptions extended the QR generation time to around 40 seconds.
This was far too long to generate a QR code every second, but it could definitely update once a minute which is all that was absolutely necessary for a clock. I’ve never done something so computationally intensive on an AVR before, so I just assumed that 45 seconds was a reasonable amount of time. While it would have been nice to update every second, I was amazed I got it to work at all.
Regardless of the fact that my clock doesn’t meet the guidelines for border thickness, he linked to a library that was supposedly able to generate a QR code in less than a second. This got me thinking that it might be worth trying to optimize my code before resigning to a once a minute update.
With my shipment date just around the corner, I thought it’d be fun to discuss what I discovered.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.
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