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John Rampelt

@mavica_again @shac @cabel

I've been playing with little LCD panels like this a lot lately. 🤣

The SPI bus is also slow(ish). Using a Raspberry Pi Pico 2 (released last year) it takes about 46ms to update this 240x240 pixel display using a 16-bit (RGB565) colour space.

Using an Arduino Nano ESP32 (released less than 2 years ago) it takes about 24ms to do the same. A 60Hz display update rate means the LCD controller will interrupt the external microcontroller every 16.67ms, so each of the microcontrollers I'm using won't be able to transfer the entire image without 2-3 interruptions!!

And the ice cream machine's microcontroller is probably older and slower... 🍦

A 1/54" 240x240 pixel LED display being driver by a Raspberry Pi Pico 2 microcontroller on a BEAPER Pico circuit. The display shows a colour bar and timing test, indicating the number of microseconds to perform specific software and hardware graphics operations.
Mar 09, 2025, 02:16 AM·Public·Web
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