[SOLVED] NodeMCU ESP-12E Arduino & Blynk program

Hello all, and thanks for your assistance in any way

Project parts list
NodeMCU ESP-12E , jumpers , srd-03vdc-sl-c relay , breadboard and USB cable

project software
Arduino 1.6.9 , codes downloaded from Blynk and Blynk app on my Android

what im trying to accomplish is use the Blynk app to control a relay through the NodeMCU ESP-12E with the following code , issue im having is, it is not tripping the relay to change position of NO/NC

#define BLYNK_PRINT Serial   
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "******************";

void setup()
  Blynk.begin(auth, "******", "***********");

void loop()


I tried pins D1/D2/D7 to GND the pins are selected in the app
if using a LED and a 200o res the LED blinks

Ok used a transition to control GND and solved this issue.