Thank you. I will try it again after buying the wire

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

<code>

#include <M5Stack.h>

void setup()
{
M5.begin();
M5.Lcd.setBrightness(30);
M5.Lcd.clear();

}

void loop()
{
M5.Lcd.setCursor(160, 120);
int adc = analogRead(36);
M5.Lcd.println(adc);
Serial.println(adc);
delay(2);
}
</code>

My self and Ken are using the grove port which is pin 22&23 and so can't move it over to a different port.
@ken57093 - I haven't forgotten about you my friend, I just been busy trying to finish some of my backlog of projects which the M5Stack is proving to be very usefull for.

Thank you. But i just have this wire and I use your code still unsuccess.
http://forum.m5stack.com/assets/uploads/files/1538465243067-20181002_152122-resized.jpg

<code>

#include <M5Stack.h>

void setup()
{
M5.begin();
M5.Lcd.setBrightness(30);
M5.Lcd.clear();

}

void loop()
{
M5.Lcd.setCursor(160, 120);
int adc = analogRead(36);
M5.Lcd.println(adc);
Serial.println(adc);
delay(2);
}
</code>

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()
{
M5.begin();
Serial.begin(9600);
pinMode(ROTARY_ANGLE_SENSOR, INPUT);
pinMode(LED,OUTPUT);
}
void loop()
{
float voltage;
int sensor_value = analogRead(ROTARY_ANGLE_SENSOR);
voltage = (float)sensor_valueADC_REF/1023;
float degrees = (voltageFULL_ANGLE)/GROVE_VCC;
Serial.println("The angle between the mark and the starting position:");
Serial.println(degrees);
}

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

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

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

#define ROTARY_ANGLE_SENSOR 39

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

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

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

Do you have any ideas?

@ajb2k3
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)