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ADAFRUIT.md add note about SPI baudrate.

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Peter Hinch 2021-01-28 07:07:27 +00:00
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@ -80,6 +80,9 @@ work. Note that the Pyboard hardware SPI supports only 10.5MHz and 21MHz.
In practice the 41ms update time is visually fast for most purposes except some In practice the 41ms update time is visually fast for most purposes except some
games. games.
Update: even with a PCB and an ESP32 (which supports exactly 20MHz) it did not
work at that rate.
## Power consumption ## Power consumption
The power consumption of OLED displays is roughly proportional to the number The power consumption of OLED displays is roughly proportional to the number