ESP32 ADC - Read Analog Values with Arduino IDE

For complete project details (schematics + source code), visit ► RandomNerdTutorials.com/esp32...
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This video shows how to read analog inputs with the ESP32 using Arduino IDE. Analog reading is useful to read values from variable resistors like potentiometers, or analog sensors.
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[@RuiSantosdotme]

You can find the complete project details (schematics + source code) on my blog ► RandomNerdTutorials.com/esp32-adc-analog-read-arduino-ide/
Enroll in "Learn ESP32 with Arduino IDE" Course ► RandomNerdTutorials.com/learn-esp32-with-arduino-ide/

[@samarthagarwal6929]

Thanks Man. Life would have been so difficult without you !!

[@ebcradioshow]

Rui Great Work this really help me out. :)

[@abumoslemtamer7331]

شكرا جزيلا !

[@quaternion-pi]

Great explanation. Using an interrupt instead of delay(1000) would be nice for integration with other functionality. Have you done a video on interrupts with the esp32? Thanks for sharing your expertise.

[@Marcink126]

There is probably no video about that as there are not interrupts supported by the ESP32 HAL for Arduino.

[@dpintassilgo]

Boas! Muita bom Rui! Olha... onde é que compras os teus ESP32 ?

[@marks47]

So with both power and ground connected, is it doing pull-up and pull-down on this simultaneously, or is that only for digital switches?

[@ghanemturki]

Thanks

[@slaviormanliev4494]

Great tutorial. Can help me with some project? I use ESP32 Devkit V1 and i connected digital led WS2812B, 4 channels relay module , DS18B20 sensor, and capacitive soil moisture sensor.I supplied all of them with Vin. The capacitive soil moisture sensor shows different value when i turn on digtal led or relay module, what's maybe i wrong with connection or i need to write code for adc. Capacitive soil moisture sensor connect on GPIO34 , digital led is in GPIO23, DS18B20 sensor in GPIO4 and for relay module i use GPIO 2, 26, 27, 33.

[@hayalci_33]

esp32 & st7781 tft lcd display pin connection help
What is LCD_RST, LCD_CS, LCD_RS, LCD_WR, LCD_RD esp32 pin equivalent

[@qzorn4440]

now for a scaled 0 to 10 vdc input signal with zero and span adjustments then oled display output value with tenths resolution 00.0... thanks a lot...:)

[@sreeram607]

Can I use 5v pin

[@sivakumarc3853]

hiii .....i can't found port option in Arduino ide.......since it is grey colored.....what have to do to enable the port option for selecting the corresponding port.

[@happysingh-gk2dj]

Hello sir , I am also using potentiometer but adc value fluctuate a lot also noise glitches visible .. plz guide me what I can use it will be really helpful thankyou

[@MrBMWerner]

How much ohm should the potentiometer can have?
Sorry for bad english

[@rizvian24]

How many analog inputs can ESP32 handle?

[@maysaraabdula]

Thank you for the fast tutorial, please help me in getting the real linear value on any of ESP32 ADC channels ,
lets say we want to make a simple voltMeter using ESP32:
Actually when volt is 0 ADC value is 0 ,
when volts 3.3 ADC value it 4096
but any values in between is NOT related to to the linear equation:
3.3v ----> 4096
???v ----> ADC value
so: voltage =ADC*3.3/4096 , is a wrong way to measure voltage using ESP32
from my side i tried but i got wrong results.
could you make a video that explains this issue ? then provide a solution if possible !

[@nguyenvansi9764]

esp32 adc non linear

[@leemarc7069]

does not work for esp32 s3R8 lilygo t-display

[@0124akash]

But this is not accurately reading.
How to resolve this ?

[@jorgeneiva6671]

have try the code, the value readed is not the value it should be. when convert 4095 to voltage should be 3.3V but says its 3V

[@oswaldolopez4446]

ADC is not linear!

[@jorgeneiva6671]

What can do to fix it?

[@oswaldolopez4446]

Check his blog, there he has a link to a discussion about this non linear ADC. In addition, check your data type, if you have an integer, it is not going to show decimal values, you may want to use a float type.

[@hansdegroot652]

My analogread only returns 0

[@rawyin]

My kingdom for a video discussing measuring frequencies off an analog input. Ugh. The search continues.

[@andrewdollins2321]

J. Bly look up FFT that is the best way to get the frequency content from an analog signal.

[@rawyin]

@@andrewdollins2321 FFT FTW? On it, thanks for the pointer.

[@DeepBlueMbedded]

@@rawyin Maybe "zero-crossing detection" is much, computationally, easier for you to do. That depends on your particular application. Hint: the Zero-Crossing point can be adjusted to meet your needs, so it doesn't have to be "real zero" volt point.

[@OkOtChA]

Boas rui estou a tentar fazer este projecto ua-cam.com/video/G0F31zrWHU8/v-deo.html No entanto a minha dificuldade está que PINS usar no ESP32.