digitalWrite HIGH & LOW inverted (SOLVED)

[Mutabor]

Hello!

I bought the following board:
http://www.aliexpress.com/item/Free-shipping-NodeMCU-development-board-for-ESP-12E-from-ESP8266-esp-12E-Lua-IoT-programable-wifi/32583355412.html




I use the Arduino IDE, and everything works pretty much fine. I only have one problem:
If i test it for the blink sketch it reads HIGH as LOW and LOW as HIGH.

Example:

Code: [Select]


void setup() {
// initialize digital pin 16 as an output.
pinMode(16, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
digitalWrite(16, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(16, LOW); // turn the LED off by making the voltage LOW
delay(100); // wait for 1/10 second
}


This should do (as far as i know) that the LED is on for 1 second and then have a short pause of 1/10 second.
But what the board is really making is the opposite. The LED is off for 1 second following a short blink 1/10 second and so on...
Am I insane or is this plain inverted?

I'm on a mac with Arduino IDE 1.6.8
I use the following bridge drivers:
https://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspx

Thank you for answers!

[graynomad]

Do you have a schematic? Maybe the LED is connected to VCC and not GND.

[Riva]

If the NodeMCU is using the same schematic as the below then yes the LED is inverted and will be on when pin is low and off when pin is high.

[Mutabor]

Thank you so much! It works!

I was so excited over the new board I only tested the onboard LED.
The fact that it worked exactly inverted confused me a lot, I thought it is a hardware problem.

I really appreciate your help!

[GiovanniBernal]

I got the same problem, so just to know, In ES8266 when you rite LOW(at least in the built in led) it goes on Right?