Whenever I boot up the esp8266 or flash code via usb ,I have to remove vin pin otherwise it does not boot up.
If I remove vin pin then flash and boot up happens and then i am able connect vin with 5 V relay.(using VIN to power up relay) .
I dont understand what it has to do with VIN pin.please suggest.
I am using below pins for eight devices
//relay pin setup for funct
int relayOne = 5;
int relayTwo = 4;
int relayThree = 0;
int relayFour = 2;
int relayFive = 14;
int relaySix = 12;
int relaySeven = 13;
int relayEight = 15;