The best input and output pins on the NodeMCU ESP32 and ESP8266

Wow. I never imagined Terry Silver from Karate Kid 3 would teach me so much about GPIO in ESP boards, but here we are. Thanks, Terry! This was super useful! 🙂

How to use gpio15 for relay in esp8266

Thanks!

on the esp8266.. pins 0-14.. when you say pins high on boot... what is the pinMode of the pins at boot.. is this input high through the internal pullup resistor or output high.. because if they are digital outputs at boot and I connect a module or what not set as output also to those pins.. that would short the pins to ground/vcc vice versa when pins source or sink currents. which might burn the pins..

Wow Rob, I cannot believe this was 4 years ago! Still useful as a reference.

very helpful thank you sir

Hi, Great video, Is it possible to add a normal on off switch to the board to turn the output on/off? Many Thanks

Hello , Could some one please clarify what is the output voltage of ESP32 NodeMCU GPIO4,GPIO16 and GPIO36 ? is it 5v or 3.3 V? When doing LEDs projects , some people suggest we us logic level shifter to control 5V led ( 300 of them using WLED ) , Please help as I tested those pins and they are close to 5V

Hello you cane make a video for analog sensor to start some output in diferent value ????

Hi Rob, I'm looking to use the ESP8266 with WLED in my permanent LED light setup and i wanted to know if there is a limit on how many IC(Integrated Circuit) Chips each Node MCU can handle? Thanks as always for all the great information!

Awesome info!

esp 32 and esp 32 nodemcu are different right?

collection of useful information. Thank you.

one can easily convert a pwm output to an analog output by adding a capacitor. In order to know what value the cap should be one will have to apply some knowledge of electronics or experimentation. What happens is that the square pulse will charge the cap to a level equivalent to the amount of current flowing out of the cap due to the amount of load. The greater the duty cycle (percent on time), the higher the voltage level that is provided. Think if it like filling a bucket with water with short pulses of water.. full on, full off.. The level of the water in the bucket (voltage) will depend on the size of the hole in the bottom of the bucket (load) as well as the amount of time the water bursts refilling the bucket are 'on'.. (greater duty cycle = higher voltage)

What are usual resistor values for pull-up or pull-down resistors?

nice presentation

You are absolutely a hero - Thanks for figuring this out!

fantastic

Can the vibration motor be connected to the NODEMCU ESP32?

Since this video was released, there have been far more libraries released for the ESP32. I have not wanted to do something and found that there isn't a library for it in the past year. I even found a nice ESPencoder library that uses... something inside that the other processors don't have (can you tell I've forgotten what!).

The video shows a Pull up resistor Green, Blue, Orange = 56K. Is this the correct value to use? How many mA goes into a GPIO input on an ESP32. Thanks for a great video.

Just checked the digital pins on my NodeMCU and I'm getting 3.3V from most of the digital pins even when my code (digitalWrite) is set to low for that pin. Any reason I should be getting voltage from these pins whenever I power up the board?

Best device comparison for the ‘32 and ‘8266 devices. Thx for sharing!

Wonderful video, thank you very much for the information. Exactly what I was looking for.

esp32 adc is very noisy when on battery and almost useless.

Great video man. Keep on.

Do you knkow if analogwrite has been implimented into the arduino IDE yet?

Thanks for the great video. I found it very informative. You explained it very well.

The best explanation, thank you

Very very handy. First time I came across your channel. Now subscribed. Won't be long before I'm switching my boiler on (or off) from my phone in bed on unexpected cold nights. 😉👍

Thank you for this video you got a new follower

you're the best! great video my friend!! thanks (y)

Excellent and trully educational video! Would it be possible to combine esp8266 with I/O and analog expansion boards such as MCP23017, pf8574 and ADS1115 and copare it with esp32 native pins. Reliability, simplicity and power consumption would be an interesting comparison.....

Oh. Values are incorrect.
10 bits are 0 - 1023 (You said 1024) and the 12 bit from the ESP32 is 0-4095 not 4096.
Just saying. Nice video still :)

Thank you from Croatia.

hi sir, How can i put a constant Hz for the PWM, i need 60Hz , what is the code ill put to make a constant PWM?

Thanks by the way for the explanation

Hi man please can we tasmotise the esp32 chip

Thanks

Again, the most useful video for esp I have seen. Thanks for this quality content.

Useful cheat sheet, thanks!

Big help

Most useful video I'v seen today

This video explains why I failed in many of my projects, Thanks from Colombia.

Awesome explanations. Because of that, I have just subscribed your channel. Thank you.

so i need to use a NodeMCU ESP32 with an IC2 display for local reading and remote reading via web for a analog ph sensor and a DS18B20 Temperature Sensor and cannot for the life of me get it to work can you help?

I use esp32 and can't pull down pin no 5.

Perfect! i wish this video was uploaded half year before..it would save me tons of time..
I think a very good add on to this, would be a video about available I2C and SPI channels to esp8266, esp32 and esp32-cam (which expose less pins)

Fantastic video!