Actions
Forum Thread Details
  • State Suggested Answer
  • Replies 17 replies
  • Answers 1 answer
  • Subscribers 385 subscribers
  • Views 2172 views
  • Users 0 members are here
Related

X9C503 works with ESP32?

Ricodora

I can't get X9C503 to work with ESP32 but it can with Arduino Mega.

What do I need --> To be able to operate the X9C503 to lower the volume of an audio line input. I don't want to use common manual potentiometers.

X9C503 Scheme:

INC__| o o | VCC
U/D__| o o | CS
RH___| o o | RL
GND__| o o | Rwiper

In my case:
INC------| o o | VCC (5v)
U/D------| o o | GND
Audio in | o o | GND
GND------| o o | Salida

On Arduino Mega I connect everything directly to the board and the operation is correct.

In ESP32 if I connect it to the board it doesn't work, so I have used the 2N3904 diode for the 'INC', 'U/D' pins (I have also tried with 'CS' but Arduino Mega does it well being grounded), and It works but it doesn't do it well, I describe the problem:

You have to enter values between 0 and 99, and in general it does it well, for low values the volume goes down and for high values the volume goes up. I detected the problem by always entering the same value.

In this case it was '91', if I enter it several times in a row I get different results, normally the volume remains constant but sometimes it goes up, other times it goes down and even total silence occurs

With Arduino Mega I enter the '91' 500 times and the
The volume never changes, it is constant and its operation is always correct.

What could be the problem?
What other component can I use?

As an alternative, I have tried the FM62429, with ESP32 it works correctly, but it has the amplification function that does not suit me. For the line input I already use 22kΩ resistors, then the potentiometer and finally the MSGEQ7, it doesn't make much sense to change a potentiometer to lower the voltage and replace it with a component that can amplify. I can limit the FM62429 by code, for example, to 60% and only use it to lower the volume, although I don't think it is a very elegant solution.

Audio Line In -> 22kΩ resistors -> X9C503 -> MSGEQ7
Audio Line In -> 22kΩ resistors -> FM62429 -> MSGEQ7

Any ideas or suggestions?

[code]#include "X9C10X.h"
#define CSPIN 33
#define INCPIN 14
#define UDPIN 27
X9C503 pot;

void setup() {
Serial.begin(9600);
pot.begin(INCPIN, UDPIN, CSPIN); // pulse, direction, select
Serial.println("Introduce un valor entre 1 y 99");
}
void loop() {
if(Serial.available() != 0){
int value = Serial.parseInt();
if (value != 0) {
pot.setPosition(value, true);
delay(30);
Serial.print("Valor introducido: ");
Serial.println(value);
}
}
delay(100);
}[/code]
  • 0 in reply to Ricodora

    I think the mistake you are making is not measuring what is happening. You can't do electronics work without measuring things..

    I think you are saying that your ciruit does not work with the 4k7 resistors in either place or not there at all ?

    SO we need to measure the voltages on the pins of the X chip.

    For that you need a meter (but you had better tell what kind of meter you have because it can affect the results.)

    Ideally you would use an oscilloscope but you may not have access to one.

    MK

  • 0 in reply to michaelkellett

    I said the 4k7 resistor didn't work when I first assembled it wrong. Now that you've pointed out my mistake......IT HAS WORKED!!! What a great relief! ClapClapClapClapClapClap

    mk you got it right, now if I enter the same value I ALWAYS get the same output

    So... Whenever I use a transistor to drive an IC at 5V, should I use the 4k7 resistor to ground so that it can take the LOW value?

    Interestingly I am using the 74HC4051N also with transistors and it works correctly without "the path to ground". Even though in this particular case it is working, should I use "the ground path"?

    Seems like a basic concept for IC usage, I'm happy

    I have a multimeter and I take the measurements, which with the little knowledge I have, I consider interesting. I have not shared it due to lack of experience in forums, in solving this type of problem, it has not occurred to me. There were certainly measurements that I did not understand but that an experienced person can interpret perfectly. Next time I'll do it from the beginning

    Image of the setup that worked:

    ESP32 driving an X9C503

    CODE

    [code]
    #include "X9C10X.h"
    #define CSPIN 33
    #define INCPIN 14
    #define UDPIN 27
    X9C503 pot;
    void setup() {
    Serial.begin(9600);
    pot.begin(INCPIN, UDPIN, CSPIN); // pulse, direction, select
    Serial.println("Introduce un valor entre 1 y 99");
    }
    void loop() {
    if(Serial.available() != 0){
    int value = Serial.parseInt();
    if (value != 0) {
    pot.setPosition(value, true);
    delay(30);
    Serial.print("Value: ");
    Serial.println(value);
    }
    }
    delay(100);
    }
    [/code]
  • 0 in reply to Ricodora

    The 74HC4051 is an 8 channel multiplexer - not sure how you could use it in this application - did you mis type the part number ?

    You might have meant the 74HC4050 which is a hex level shifter but for high voltage in, low voltage out - so OK for 5V parts to drive 3V parts but not good for 3V parts to drive 5V parts.

    MK

  • 0 in reply to Ricodora

    Glad it's working, this demonstrated that the product you have isn't an original/genuine part, because if it were, then it would have worked with 3.3V logic levels. You were forced to use the transistors as a result. The circuit would not have needed the transistors if the part was genuine.

    Regarding purchasing from AliExpress, you're OK with parts like capacitors, resistors, potentiometers etc. They may not be the best quality but should function electrically. With transistors and diodes, you will might obtain completely different parts, but often a jellybean part is OK. If you're doing something critical, if the part is used in a more sophisticated or high-performance way, then it wouldn't be worth trusting the AliExpress purchase. For ICs, I think it's more likely than not to obtain a fake/clone, so ICs are best avoided from AliExpress, unless you really know what you're doing.

    If it were me, I would definitely not buy 100 x 74HC4051N from there. You might get lucky, but each time a circuit doesn't work, you'll be unsure if a few or many of those ICs are faulty. 

  • 0 in reply to michaelkellett

    I use the 74HC4051N as a switch to change between the audio line input and the microphone input. The project I'm doing has more parts. I also use it to set the decibels on the MAX9814 microphone

    The circuit pictured is to show my testing and to run the X9C503 in isolation (a simple case to learn and test)

    I do projects with microcontrollers and LEDs. This was the last step to be able to configure the microphone and input line without using physical components such as switches or potentiometers. I have already integrated the X9C503 into my project, it works correctly and I can now manage the configurations from my mobile (android in my case)

    Thanks for your time

  • 0 in reply to Ricodora

    Sorry, I misunderstood your reference to the 4051.

    Happy to hear your system is working now.

    MK

  • 0 in reply to shabaz

    I love AliExpress, I enjoy buying hundreds of cheap components, it gives me the opportunity to try many components that I would not buy originals...

    But I can't ignore the quality, the comfort and the good way. I don't want the quality of my work to be bad to save a little money. I will use only original ICs.

    I guess I had to have this problem with the X9C503 and this conversation with you to get on the right path.

    Great! Thank you