Another limitation if you are not careful. Also, remember that certain GPIO (0, 2 15) must be in specific states during boot and flash.Some experimenters say that they have used GPIO9 and GPIO10 for input and output, respectively.For example if you are using SPI with two peripherals, you tie up 8 pins: D5.D8 for the bus, two more pins for select, and two more pins for control. If you are using hardware Serial Peripheral Interface Bus (SPI) to communicate with peripherals, pins D5.D8 become unavailable, as they are used for hardware SPI.But, I have not been able to get this to work reliably. I have read that if your program does not use serial communications, you can also use D9 and D10 as digital I/O. D9 and D10, also labeled RX and TX on some boards, are also used for serial communications, including loading programs onto the device.becomes the starting point for pulses in PPM signal. These also support Arduino style pin interrupts, except for D0, which cannot support PWM either. Download and share free MATLAB code, including functions, models, apps, support packages and toolboxes. The basic pins for digital input and output are D0.D8. NodeMCU ESP8266-12E Limitations Mostly Effect GPIOÄ«ased on my reading and experimentation, here is what I have learned about NodeMCU ESP8266-12E limitations with GPIO pins. gpio 2 = d4 this pin must be disconected during bootup but if you plug it in affet it will boot
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