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;