[Solved]How to use the angle sensor?

  • I'm trying to use the angle sensor but the output always show 0.
    Can anyone give me some tips?
    Thank you!!

  • What does your code look like?

  • hello
    try to connect sensor to 36, the PORTB, test

  • @heybin 0_1538443658559_3594191f-351e-48e2-bb0a-3f26f0ca7af1-image.png
    Here is some different on the monitor. However the output still not controlled by the sensor.Will you have another idea? Thank you.
    I had tried digitalread() for both 22 and 36. Only 22 return 0 or 1 and 36 only return 0

  • What device are you using and have you tuned the sensor?

  • @ajb2k3
    ESP32 M5 core

  • As far as I am aware, the core doesn't have one!
    The silver, M5go and fire have them.

  • @ajb2k3
    Okay... Thanks a lot!

  • @ken57093How to use the angle sensor? 中说:

    Okay... Thanks a lot!

    your talking about the white thing?
    Sorry i was confused as i dont have the white thing

    Digitalread returns 1?

    Looks connected, try analogread() on 22 (not spelt correctly)

  • @ajb2k3
    Yes, the white thing is the angle sensor and i connect it to the M5 Core. The Digitalread returns is 1.

    I had tried analogread() on 22 but cannot get the angle change on the serial monitor (Its always 0).

    Do you have any ideas?

  • @ken57093
    Sorry posting while half asleep.
    According to the datasheet GPIO22 in on pin 39 however, grove specs should have it as not connected in analogue read mode.
    Just checking the various documents and according to them you may want GPIO 21 which is on pin 42 (again sorry, i'm half asleep and rushing to work.)

    Have you downloaded the esp32 data sheets and they are very usefull to read through?

  • @ajb2k3
    Thank you.
    Do you mean changing "#define ROTARY_ANGLE_SENSOR 22" to "#define ROTARY_ANGLE_SENSOR 21"?

    I changed 22 to 21 but there is no difference except digitalread() of 21 is always 1.

  • @ken57093 gpio22 in NOT on pin 22 gpio is on pin 49 according to the datasheet

    Opps there are only 48 pins. the define should be 39!

    #define ROTARY_ANGLE_SENSOR 39

  • @ajb2k3
    Thank you.

    I had tried. There is no change when i steer the sensor, but the value will sometime auto change itself.


  • @ken57093 , sorry, will try setting up a test rig and test.
    Haybin said to try 36!

  • @ajb2k3

    I had tried before. The output of 36 is similar to 39.

  • @ken57093How to use the angle sensor? 中说:

    Ok, set up my test rig and getting the same results.
    This is my code and I think something is missing.

    #include <M5Stack.h>
    /macro definitions of Rotary angle sensor and LED pin/
    #define ROTARY_ANGLE_SENSOR 36
    #define LED 3 //the Grove - LED is connected to PWM pin D3 of Arduino
    #define ADC_REF 3.3 //reference voltage of ADC is 5v.If the Vcc switch on the seeeduino
    //board switches to 3V3, the ADC_REF should be 3.3
    #define GROVE_VCC 3.3 //VCC of the grove interface is normally 5v
    #define FULL_ANGLE 180 //full value of the rotary angle is 300 degrees
    void setup()
    void loop()
    float voltage;
    int sensor_value = analogRead(ROTARY_ANGLE_SENSOR);
    voltage = (float)sensor_valueADC_REF/1023;
    float degrees = (voltage
    Serial.println("The angle between the mark and the starting position:");

  • OK analogue read does not work, the command is something like ADC1 get raw (or some such)

  • M5Stack

    I can get a readout from the angle sensor on both the serial console and lcd with this sketch. Try it out and see if it works for you. I'm using the m5go but the pinout should be the same. Make sure you connect the black wire to gnd, the red wire to 5v and the white wire to 36


    #include <M5Stack.h>

    void setup()


    void loop()
    M5.Lcd.setCursor(160, 120);
    int adc = analogRead(36);

  • @lukasmaximus

    Thank you. But i just have this wire and I use your code still unsuccess.

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