12/8/2023 0 Comments Esp8266 arduino buttonThat's why it is recommended to use an i2c display (2 pins) or a neopixel/ws2812 (1 pin).Īlso don't forget that you only need 3 buttons, every other button is optional. Now you don't have to be a genius to figure out that if you want to use all 6 buttons (6 pins), a SPI display (4 pins) and a RGB LED (3 pins), 11 pins are not enough. That leaves us with 7 safe to use pins and 4 more which we have to be a bit careful with. You can use them safely as long as you don't select QIO in the upload/compile settings. SD2 and SD3 are used for the on-board SPI flash.if you run into problems when uploading, keep in mind that the pin is used to get the device into flash mode. D3 or GPIO 0 is used for the flash button. Don't use these pins unless you know what you're doing!
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