The nodemcu I found on internet has no 5V pin...
..and if the device is 3.3v, it should not be fed with 6 AA batteries. 3 or 4 should be sufficient... al the other energy will be converted to heat in the regulator.
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It is a VU pin near ground and A0 pin, i thought this was a 5v pin. But even if i am connecting it to 3.3v its not working
Hi,
Do you have LEDs connected as in your code?
pinMode(LED1, OUTPUT);
pinMode(LED2, OUTPUT);
pinMode(LED3, OUTPUT);
pinMode(LED4, OUTPUT);
pinMode(LED5, OUTPUT);
pinMode(LED6, OUTPUT);
Is this your controller;
Vin is probably the regulator input.
Material: Experimental Board + Mixed Alloy
Color: Black
Chip Module: CP2102
Working Temperature: -40 ℃ ~ +125 ℃
Power Input: 4.5V ~ 9V (10VMAX), USB-powered
Drive Type: Dual high-power H-bridge driver
Current: continuous transmission ≈70mA (200mA MAX)
Standby: <200uA
Size: (L)X(W)4.8X2.5cm/1.89''X0.98''(appr.)
What voltage are you applying to Vin?
Do you have a DMM?
Thanks.. Tom.. 
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