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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@user81779
That's a great solution! I still need the expander for incorporating an 8x8 key matrix, but then with the nRF24 and MAX7219 sharing the SPI pins I can do hardware SPI for them. Then I'll still have additional GPIO on the expander for simpler input/output.
Question, can I share I2C pin (ex. CLK) with SPI usage, esp. when the I2C pins have external pullup resistors?