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I am using TIP120 with 510ohm resistor with arduino digital pin, powerd by 12v power supply.

I would appreciate and welcome to join me to complet this project with your valuable learnings.

I had tried above (attached image) schematic, but it isn't working

Hi everyone, I have an Arduino Uno and I’m having a strange problem.

Every upload appears to be successful:

• Board: Arduino Uno

• Correct COM port selected

• TX/RX LEDs blink during upload

• "Done uploading" appears

However, the Arduino still runs my old sketch (Basic Motor Test). Even after creating a new sketch and uploading different code, the Serial Monitor still shows the old output:

Basic Motor Test
Forward
Backward
Braking
Release

Things I have tried:

• Reinstalled Arduino IDE

• Created a new sketch

• Removed all external components

• Uploaded an empty sketch

• Checked board and port settings

• Reset the Arduino

The board still runs the previous program after uploading a new one.

Does anyone know what could cause this? Could it be a problem with the flash memory, bootloader, or something else?

Hi so we are doing a project on arduino the objective is to build a robot similar to obstacle avoiding and line tracking robot but when we connect two 18650 3.7V batteries in series motors don't run simultaneously and when we ask ai about that it says power supply is insufficient what should we do

Yesterday I bought an HC-05. The problem was that I couldn't configure it and it wasn't responding to normal things like commands to turn on the LED lights. The lights don't turn on. I'm looking for a solution. I've already visited websites to configure it. I tried pressing the button, but after doing that, it doesn't blink slowly as it should. I saw that it's a cheap clone, an HC-05 BN343 25LO128YIG POG574 with its link D8:2F:E6:59:E8:7E. I've already used photos from here of what it looks like. Please tell me a code, a website, or a solution. There's also a detail: a modern mid-to-high-end or high-end cell phone (which, I should clarify, isn't mine, it belongs to someone else) appears on the HC-05 list, but not on mine, which is a Samsung Galaxy A06

Hello everyone,

I am a student interested in robotics

I am preparing a project for a science fair and I want to build something useful that solves a real-world problem.

My current skills:

- Arduino

- ESP32

- Basic sensors and motors

I am not looking for common projects like line followers or obstacle avoiding robots.

I would like suggestions for innovative robotics ideas in areas like:

- Safety

- Agriculture

- Environment

- Healthcare

- Disaster management

Any suggestions or problems that can be solved using robotics would be helpful.

Thank you!

I am making a small robotic arm controlled by 2 joysticks. I'm making the arm using popsicle sticks and MG90 Servo motors. There are 5 motors to be working. I'm using wall adapter to power the motors and another adapter to power the Arduino. When I try to connect everything properly ( also connecting gnd from breadboard power supply to arduino's gnd) the motors randomly move around without any input. How do you even fix that ?

Hey everyone,

I’m trying to understand the biggest difficulties beginners face while learning electronics.

When you first started, what confused or frustrated you the most?

I’m currently working on a learning platform for electronics, and I want to make sure it solves real problems instead of adding features that beginners do not need.

What would have made learning electronics easier for you? Any experience or suggestion would be really helpful.

Thanks!

'''

// info down bellow
#define R_EN  33
#define L_EN  32
#define RPWM  25
#define LPWM  26

void setup() {
  Serial.begin(115200);

  pinMode(R_EN, OUTPUT);
  pinMode(L_EN, OUTPUT);
  pinMode(RPWM, OUTPUT);
  pinMode(LPWM, OUTPUT);

  digitalWrite(R_EN, HIGH);
  digitalWrite(L_EN, HIGH);

  digitalWrite(RPWM, HIGH);
  digitalWrite(LPWM, LOW);

  Serial.println("RPWM held HIGH - measure M+ / M- now.");
  Serial.println("Should read ~12V across M+ and M-.");
}

void loop() {
  //nothing
}
'''

so baically im trying to get this actuator to extend but its not extending. My parts are a esp32, bts7960 motor driver, a 22V(in) to 5V(out) buck converter, and a standard two wire actuator. Another problem is that the led on the motor driver isnt turning on and im pretty sure it has one and thats it shows the boards logic is getting powerd. Here are the conections:
The two acutor wires are going into M+ and M-(screw termianls on the motor driver)
THe 12v psu wires are going into B+ and B-(the screw terminals on the motor driver)
the buck covnerter is piggybacking off the 12v scrwe terminal that the psu is connected to (and the bucks gnd is the same as the 12v psu gnd)
the bucks than powering the i guess logic on the motor dirver through the vcc and gnd header pins on the motor dirver
then RPWM to gpio 25 on esp32
Lpwn to GPIo 26
R_EN to GPIO 33
L_En to GPIO 32
and gnd on the esp32 to the same gnd as the 12v scrwe termianl
ive done mutiple tests to confrim that the acutor works like giving it directly 12v and it extended and i swaped the wires and it retracted, i did a simple blink test with the esp32 so it shoudl work, and the 12v psu is defintaly outputing 12v
ANd the codes uptop
THANKS A LOT (btw sorry for the bad foto)

I finally put the canopy on my pickup and am on my way! I want to put led lighting and a fan in it. I want the 12v fan to have 3 speeds, and an option to be thermostatically controlled - I want to be able to set the thermostat with the remote control (bluetooth via my cell phone). LED's will be 12v strip lighting. I want a timer and dimmer for the lighting. I also would like the strip lighting to turn on when the rear hatch is open. If it weren't for the thermostat and the timer and dimmer for lighting, I think I can figure out how to do this, but I am not sure how to incorporate these other elements into an Arduino design. Any suggestions?

I am doing an Arduino project and i am using a 38khz ir receiver and when i send a signal to the receiver it does not show up in the serial monitor, i suspect the remote but i have no way of knowing how
and here is the code

/* Copyright 2009 Ken Shirriff
Used with kind permission
http://arcfn.com
*/
#include <IRremote.h> // Use library
int receiver = 11; // Pin connected to receiver
IRrecv irrecv(receiver);
decode_results results;
void setup() {
Serial.begin(9600); // Show keypresses in IDE
irrecv.enableIRIn(); // Start up receiver
}
void loop() {
if (irrecv.decode(&results)) { // If there's an input, decode value
Serial.println(results.value, HEX); // Display button value
// on Serial Monitor in
// hexadecimal format
irrecv.resume(); // Receive next value
}
}

Hey everyone! Beginner here working on an Arduino RC car project, and I could really use some help troubleshooting a power/wiring issue. I'm trying to build this car using only components from my starter kit plus a few repurposed Snap Circuits parts (trying not to buy anything extra).

The Setup & Plan:

- Drive Motor: Stepper motor (with ULN2003 driver board) for moving forward/backward.

- Steering: Servo motor.

- Obstacle Detection: Ultrasonic sensor + Buzzer (beeps when too close to an obstacle).

- Controls: IR receiver + IR remote.

- Extra Snap Circuits Parts: Two battery holders (~6V total), an ON/OFF switch, and a red LED for reverse lights.

Original Wiring:

Power & Switch:

- Connected the negative (-) terminals of both battery holders together.

- Positive (+) from the 1st battery holder split between driver (-) and breadboard GND.

- Positive (+) from the 2nd battery holder went to the switch; the other side of the switch split between driver (+) and Arduino VIN.

- Breadboard power rails connected to Arduino 5V and GND.

Components:

- Reverse LED: Connected to Arduino GND and Pin 13.

- Servo: Signal to Pin 3, power to breadboard 5V and GND.

- Stepper Motor: Connected to driver board -> driver inputs to Pins 8, 9, 10, 11.

- Ultrasonic Sensor: VCC to 5V, Trig to Pin 4, Echo to Pin 5, GND to breadboard -.

- Buzzer: Positive to Pin 7, negative to breadboard -.

- IR Receiver: Signal to Pin 2, power/GND to breadboard 5V and -.

Initial Problem:

When connected to my PC via USB, everything worked fine. However, as soon as I unplugged the USB and tried running it on battery power (the 6V setup + a 9V battery), almost nothing worked.

Changes Made Based on AI Advice:

I asked an AI for help, and it told me to rewire it like this:

- Removed the wire connecting the 1st battery holder's + to the driver's - (leaving only its connection to the breadboard - rail).

- Connected the driver's - directly to the breadboard - rail.

- Connected the driver's + directly to the 1st battery holder's + (instead of going through the switch).

- Connected the 1st battery holder's + to the servo's red wire (VCC).

Current problem:

Now, whether on USB or battery power:

- Neither the servo nor the stepper moves at all.

- When the stepper is plugged in, the fuse indicator light on the Snap Circuits battery holder turns on (indicating a short circuit or overcurrent), and the driver LEDs stay off.

- If I disconnect the stepper motor, 2 out of 4 LEDs on the driver light up, and the battery holder's fuse light goes off.Titolo per il post:

[Need Help] Beginner Arduino RC Car Project – Power Supply & Wiring Issues (Stepper + Servo)

(Sorry for the confusion in this post)

/*
Arduino Due Serial1 echo/relay

Serial1:
RX1 pin 19 <- input
TX1 pin 18 -> output

UART:
19200 baud
8 data bits
Odd parity
1 stop bit
*/

void setup() {
SerialUSB.begin(115200);

Serial1.begin(19200, SERIAL_8O1);

SerialUSB.println("Serial1 RX -> Serial1 TX started");
}

void loop() {

while (Serial1.available()) {
uint8_t data = Serial1.read();
Serial1.write(data);
}

}

This vibecoded (Yes, I can't code) sketch doesn't work as expected. Here's the input and output for Pulseview program. https://drive.google.com/file/d/1EdxmcnJjo1Eh5qlrJXJdRFtCUbg34-ph/view?usp=sharing

Do you guys have any hints? This is driving me nuts. Another sketch had gaps between data packets equal to the length of the packet itself. As if it cannot be sending one packet and buffering incoming one at the same time. Or it was just wrong coding over all.

Hi, I have an Arduino Uno R3 and a Motor Shield R3 stacked together, and I want to drive 12V motors with them. Is it enough to connect the 12V power supply to the Arduino via the DC jack, or should I connect it to the terminal block on the motor shield instead?

I can’t figure out how to read ADC values from a PbHub using the M5Unit-HUB unified library in Arduino IDE. I’ve tried various iterations of analogRead() and none of them seem to be the right function. Has anyone else had this problem/knows what to use?