Dfrobot Dissolved Oxygen meter reading 0 voltage

Projects General Guidance
1

For context I did exactly as this tutorial said: https://www.youtube.com/watch?v=BHmkOjJRYwE&t=676s and I use an Arduino uno board

Serial monitor shows 0 voltage. Could it be that my board is broken? It overheated after I did a project just before I tested the meter so I thought maybe the voltage regulator is broken.

Screenshot 2023-08-28 143935
Screenshot 2023-08-28 1439351366×768 81 KB

Additional info: code

#include <Arduino.h>
 
#define VREF    5000//VREF(mv)
#define ADC_RES 1024//ADC Resolution
 
uint32_t raw;
 
void setup()
{
    Serial.begin(9600);
}
 
void loop()
{
    raw=analogRead(A1);
    Serial.println("raw:\t"+String(raw)+"\tVoltage(mv)"+String(raw*VREF/ADC_RES));
    delay(1000);
}
2

how did you connect and power the board? a drawing of your circuit and link to the exact pH sensor model you have would help too

PS:
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3

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Here's the link.

4

did you do this ?

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5

Yes, I did everything in the instructions

6

can you post a (in focus) close up of your wiring (the real device / connexion to the arduino) ?

can you make sure you connected to A1 and not A0 ?
did you plug the 5V and GND wires ?

7

Could be.
Can you download and run the blink example?