Need Help for Robotic Arm Semester Project

[PeteKnight]

This line of code tells the Blynk library to output some connection data to the serial monitor…

@Harra_N

#define BLYNK_PRINT Serial

My guess is that your connection to D3 (GPIO0) is pulling that pin LOW all the time, and causing the NodeMCU to boot into Flash mode rather than Run mode.

Try disconnecting the wires from that pin and trying again.

If that solves the problem then read this:

ESP8266 GPIO pins info, restrictions and features

hi blynkers! the esp8266 mcu is widely used in iot projects. however, most gpio pins on this mcu have special / multiple functionality and are not safe to use in all circumstances. these “features” are still not well documented and not explained in a friendly manner for newbies. i see lots of cases when the “issues” are simply caused by not knowing which pins to use in which case. [esp8266 pin features] here is a basic table for startup. i’ve collected the info from various sources on the i…

alongside this:

Pete.