Arduino•5mo ago

I need help with my Arduino project for school

Hello thanks for reading this😁, I'm currently making a robot for school that should move his servo motors and must play saved wav files from the SD card, when a letter (for example h) gets sent trough Bluetooth (with HC-05) to the Arduino. My only issue is that for some reason I can't use the HC-05 and the SD Card Memory Modul at the same time. I can use the HC-05 while SD Card Memory Modul is unplugged and the letters arrive at the Arduino and the servo motors will move without any issue. And I also can send letters trough a USB cable connected to my pc, while the HC-05 is unplugged, and those letters arrive to the Arduino, the SD card will play the wav file and will move its servo motors without any problems. But every time I use both at the same time (HC-05 and SD Card Memory Modul, that's my goal) it seems like the letter gets sent to the HC-05 but will never arrive at the Arduino itself. I think the problem could be that the SPI of the HC-05 and the SPI of the SD Card Memory Modul are interrupting each other somehow, but I almost don't know anything about SPI lol😅. I used Chat-GPT and watched tutorials online but nothing worked for me, I don't know how to fix this issue . I hope someone in this Discord server can help me with my issue . I would really appreciate it. The Arduino code is attached down here (it might be a bit messy)⬇ Thanks for helping.😁

49 Replies

noobhoch12OP•5mo ago

AICPUyD.txt

AnonEngineering•5mo ago

right away this is an issue:

c++
SoftwareSerial BT(5, 6); // RX, TX

// define sonar sensor's pins
int trig = 5;
int echo = 6;

c++
SoftwareSerial BT(5, 6); // RX, TX

// define sonar sensor's pins
int trig = 5;
int echo = 6;

you can't use pins 5 & 6 for multiple things

noobhoch12OP•5mo ago

these r not in use right now so its not important I used before that pin 0 and 1 (rx and tx) on arduino uno for the bluetooth module and there is the same issue ofc

AnonEngineering•5mo ago

not sure I understand, but you shouldn't use pins 0 & 1 on an Uno for BT

noobhoch12OP•5mo ago

okey

AnonEngineering•5mo ago

0 & 1 are used by hardware serial

noobhoch12OP•5mo ago

I removed trig end echo and bt is on 5 and 6 and I still cant use them both at the same time could the power supply be to low? I'm using a powerbank to power the arduino with 5V output and 3,1A. @AnonEngineering so do you got any idea how to make it work?

AnonEngineering•5mo ago

without the code and wiring you are using? no

noobhoch12OP•5mo ago

The script is that 😁: https://discord.com/channels/420594746990526466/1370715689928622140/1370715719687213087 And I'm providing my wiring as soon as I'm back at home.

noobhoch12OP•5mo ago

OR YOU CAN JUST USE THIS

main.ino

AnonEngineering•5mo ago

the barrel jack requires 7v - 12v in, if that is connected to a 5v power bank that is a problem, it looks like you are trying to power several servos from the Uno 5v pin, you can't do that.

noobhoch12OP•5mo ago

@AnonEngineering , Thanks that was the problem. I gave the barrel jack 9V and it works. Last issue is that I'm only able to run the .wav file from letter h and the function hi will never start, and the other letters only work if you don't run h before running them (so theyre functions r working). So the issue must me the SD card. If you can help me with this last issue I should not have any issues anymore. The script is this attached file. Thanks for helping😊

main.ino

AnonEngineering•5mo ago

what calls the hi function?

noobhoch12OP•5mo ago

that hi function never starts because somehow the wav file stops everything else you can send h again in serial the sound gets player but function hi never starts. The same thing with the other if loops

AnonEngineering•5mo ago

after cool.play("abcd.wav"); runs then it'll go to the hi function is it playing abcd.wav?

noobhoch12OP•5mo ago

Yes But the hi function never starts because my servo doesnt move at all

AnonEngineering•5mo ago

put a print in the hi function, maybe it runs but the servo has a problem

noobhoch12OP•5mo ago

Yep you are god damn right again its appearing in the hi function and in every other function too.... it should be the servos. Does that mean the Arduino needs more voltage or something else. Thanks for helping. You are helping me so much.

AnonEngineering•5mo ago

you cannot power servos from the Arduino 5v pin (that pin can deliver at most 0.5 amps, your servos can easily draw 1 amp each)

noobhoch12OP•5mo ago

from where do I have to power them? From 3,3V?

AnonEngineering•5mo ago

that's even worse 😉 use a 4xAA battery pack for servo power (look up "Arduino external power")

noobhoch12OP•5mo ago

so something like that?

noobhoch12OP•5mo ago

or just a basic 4xAA battery slot

AnonEngineering•5mo ago

the breadboard PSU only does 500mA too, use the battery pack (it'll do a few amps peak) the positive lead goes to servo + leads (only), the ground gets tied to Arduino ground that way servos draw power from battery, arduino only supplies a low current control signal

noobhoch12OP•3mo ago

Hey, Thanks for responding. I'll try that as soon as I can. I'll let you know then (sadly I can test that in a week or so). Does the ground really just get tied to the arduino? And the arduino ground to the servos?

AnonEngineering•3mo ago

all things in the project get tied to a common reference point (ground)

noobhoch12OP•3mo ago

Yeah but the servos dont need the battery ground? Just the arduino's?

AnonEngineering•3mo ago

yes they do, servo ground = arduino ground

noobhoch12OP•3mo ago

So the ground from the battery is only connected to the arduino to complete the curcuit? So it has no other practical use

AnonEngineering•3mo ago

you connect the battery pack ground to both the arduino ground and the servo grounds battery + goes only to the servo + leads

noobhoch12OP•3mo ago

To both, that was the missing information thx But maybe we need help later on...

AnonEngineering•3mo ago

that way the battery supplies the high current to power the servos, the arduino only supplies low current control to the servos

noobhoch12OP•3mo ago

Through the normal pins like 11, 12...

AnonEngineering•3mo ago

through whatever GPIO pins you chose

noobhoch12OP•3mo ago

Ok thx

AnonEngineering•3mo ago

here the battery is shown as "Vcc" and "GND"

noobhoch12OP•3mo ago

Yeah than i got it right Thank u very much again

noobhoch12OP•3mo ago

Hey @AnonEngineering, We have connected the batteries like u told us to ,and the servo motors are moving at the beginning. But unfortunately our SD Card Module is no longer working (and we migh have other issues aswell). I haven't added all the parts, we have on our circuit on the cuircuit designer, because we still have some unused wires and parts on our circuit board. I will send our circuit and our updated script in here. I hope you can find some errors we're unable to find. We're almost out of time for the project ,so we really appreciate your help. Thanks https://app.cirkitdesigner.com/project/02e643e5-e284-43d1-9caa-d76e4469e8d0

Cirkit Designer IDE

Cirkit Designer IDE is an all-in-one circuit design tool that helps you create and share electronic circuits with ease.

message.txt

noobhoch12OP•3mo ago

AnonEngineering•3mo ago

You can't feed the servos 9v for one thing And I'm on my phone, can't really check code

noobhoch12OP•3mo ago

Thanks for the information. We’re facing another issue and its more frustrating. Its the SD card module. We suspect it may have been damaged during development, as we’re unable to run even a basic test script—neither on an Arduino nor on a Funduino. We consistently receive the error part of the script in the Serial Monitor, even though the SD card is currently empty and formatted in FAT32. Here’s the test code:

#include <SPI.h>
#include <SD.h>

const int chipSelect = 10;

void setup() {
  Serial.begin(9600);
  while (!Serial);

  Serial.print("Initializing SD card...");

  if (!SD.begin(chipSelect)) {
    Serial.println("Failed. SD module might be defective?");
    return;
  }
  Serial.println("SD card successfully detected!");
}

void loop() {
}

#include <SPI.h>
#include <SD.h>

const int chipSelect = 10;

void setup() {
  Serial.begin(9600);
  while (!Serial);

  Serial.print("Initializing SD card...");

  if (!SD.begin(chipSelect)) {
    Serial.println("Failed. SD module might be defective?");
    return;
  }
  Serial.println("SD card successfully detected!");
}

void loop() {
}

pseud0•3mo ago

If the wiring is exactly as depicted it's correct. Try a different SD card.

AnonEngineering•3mo ago

as Max said, it should be working. your code runs fine in the Wokwi simulator

noobhoch12OP•3mo ago

Hi thanks for responding @max and @AnonEngineering . Yes the SD Card Module was the problem it somehow broke and with the new one I have no longer that issue. But now to the more important part: I think I know what the issue is with the servo motors. As I said they work before I run the

lautsprecher.play

lautsprecher.play

command (so before I run the speaker). But after that I've realised it never stops trying to play something (it keeps making a small noice the speaker). So it seems like it's not a voltage problem. More like a SPI or a code problem. But I don't know alot about that stuff. I hope that helps you guys to understand my problem. Thanks:a_heart:

pseud0•3mo ago

https://github.com/TMRh20/TMRpcm/blob/v1.3.6/pcmConfig.h#L37-L39 TMRpcm library by default takes control of both pin 9 and 10 and a hardware timer, so it does affect those pins plus PWM output on possibly other pins you need to chose the pins and configuration very carefully

noobhoch12OP•3mo ago

Oh okay I got it I checked that all out and I've found a solution. We use for the servos timer 2 instead of timer 1 (I've found a libary that does that). Well unfortunately we only have one timer 2 pin that is usable (because we already use pin 11) would ya guys recommend using an Arduino Mega, instead of the Uno even though we had issues with it. Or is there any other solution?

noobhoch12OP•3mo ago

@AnonEngineering @max Hey thanks for helping with all those issues. We are now on the last step on adding all the arduino stuff into the body of the robot. We haven't reduced the 9V from the batteries that are only get feeded to the three servos, because we had no issue for now. And we were somehow able to power 2 servos, even though we only had only one usable timer 2 pin, that is currently not in use. Thans for helping

AnonEngineering•3mo ago

expect the lifespan of the servos to be reduced at 9v however, if you measure the voltage I bet it's closer to 7v, 9v batteries can't supply much current so the load will drag down the voltage.

noobhoch12OP•2mo ago

Hey, I forgot to mention. Our robot works perfectly now. Thanks for helping😁

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I need help with my Arduino project for school

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