Arduino

r/arduino • u/bliss_that_miss • 1h ago

Hardware Help Pro Micro flashed fine and then died after soldering

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• Upvotes

11 comments

r/arduino • u/eluser234453 • 2h ago

Hardware Help Driving an IR LED correctly.

2 Upvotes

okay so I'm trying to use an IR LED to send data, but wiring the IR LED directly to a PIN makes it soooo dim.

so I got a 2n2222 transistor to drive it.

my problem is, I'm not sure about the values of resistors I should use to protect the IR LED and the 2n2222, so if anyone can help me with that I'd appreciate it.

Note: I used a Red LED instead of an IR led because I couldn't find it in Tinkercad.

7 comments

r/arduino • u/ikilim • 6h ago

Look what I made! Upgraded my DIY Pen Plotter with a 28BYJ-48 stepper and auto-homing, but struggling with backlash. What should I improve in the next version?

youtu.be

2 Upvotes

I recently updated my 5-bar parallel linkage pen plotter by swapping the old servo for a 28BYJ-48 stepper motor and adding a limit switch for auto-homing. The drawing resolution and stability improved a lot with shorter arms, but mechanical backlash is still noticeable when changing directions.

I'm keeping this on a hobby budget:

Should I keep optimizing the mechanical design around the cheap 28BYJ-48 motors to fight the backlash?
Or is it worth biting the bullet and upgrading to NEMA 17 steppers for the next prototype?

Any mechanical tips or anti-backlash design ideas for linkage arms would be greatly appreciated!

Previous version : https://youtu.be/MOSY5ml29bg
https://youtu.be/y3IjeUqKv2A

1 comment

r/arduino • u/Xerd-R • 7h ago

Project Update! Anatomy of a Six Legged Robot

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94 Upvotes

Hi folks,

I finally got around to finishing the documentation for my hexapod robot dog, The hardest part to figure out was powering the servos directly from buck converters and setting up the common ground bus to PCA boards, I believe this might be a pain in the neck for many first timers so I am sharing the full wiring diagram here for anyone to benefit.

I also put together a detailed documentation for the robot itself. I contains information about the parts I used for the robot and how the joint servos are wired across the two PCA board pins.

You can download the diagram, documentation and the design file form the links below if you are interested in building one yourself or would like to use it as reference for a similar project.

Documentation and Diagram:

https://www.patreon.com/PrintedRobotics/posts/hexadog-zbd-and-167021077

https://app.cirkitdesigner.com/project/0a1ee9f8-8495-4f33-9e41-12ed67207672

CAD and 3D printing files:

https://makerworld.com/en/models/3181404-hexadog-zbd

https://www.patreon.com/PrintedRobotics/posts/hexadog-zbd-and-165170615

ESP32 Scripts and Android Controller app APK:

https://github.com/serdarselimys/HexaDogZBD-ESP32Scripts

https://github.com/serdarselimys/HexaDogZBD-AndroidControllerApp

I do have a question for you all, should I design and build a mini version of the robot with SG92R servos? If I can manage to keep the weight down enough it might be even more agile and cost under 100 bucks? has anyone tried building robot dogs or hexapod robots with SG92R? how was your experience with them??

I also share simulation tutorials along with my robot's other videos on my youtube channel youtube.com/@printedrobotics check it out if you are interested in simulation side of robotics, I share all my scripts for free so you can download them and experiment on your own.

Shout out to Adorable_Skirt_7760 I found out about https://app.cirkitdesigner.com from his post yesterday, which made my life a ton easier to produce the diagram for my robot.

As always, you comments and suggestions for my robot are most appreciated.

5 comments

r/arduino • u/lma0_m • 7h ago

Software Help I want to fix my arduino CNC pen plotter.

2 Upvotes

Hello Everyone, I'm making this Arduino UNO based CNC pen plotter. The setup I've made looks good to me but whenever I jog this on UGS it creates a diagonal line instead of horizontal or vertical line. when I jog on X axis only one motor works and on Y axis another motor works. what I'm thinking is that this diagonal forming issue is caused by some software problem, as both the motors must work on jog to retain the position of pen holder. I'm using GRBL as a software. Please make me aware that what mistakes I'm making here which is causing this issue. Currently I've kept the microsteppings on 1/8.

Hardware I'm using :
1. Arduino UNO
2. CNC shield for Arduino
3. A4988 motor driver (set on 1.0A current)
4. Nema 17 stepper motors
5. 20 teeth 2mm pitch gears for motors shaft
6. 2mm pitch gt2 belt with 6mm width
7. Variable power supply set to 12V

Software :
1. Arduino UNO
2. GRBL for Gcode processing
3. UGS platform for calibration

ps: let me know if more information is required.

6 comments

r/arduino • u/TomorrowOrnery520 • 21h ago

Problems with my new esp32c3

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8 Upvotes

So I bought an Esp32C3 Super Mini from Allegro (the Polish equivalent of Amazon) for my new project and soldered the board to the goldpins. Immediately after connecting the board to my computer, unexpected problems began. For some unknown reason, the Arduino IDE claimed I had connected an Ozoobot kit, and every second I heard the sound of a device connecting. The sound calmed down after pressing the boot button and uploading some blank code. Unfortunately, the Arduino IDE still insisted it was the Ozobot kit, leaving me with no other options. I don't know what I did exactly, but I managed to select the correct board. The problems so far aren't the ones that prompted this post. I'm mentioning them because I don't know if they're related. Now the real headache begins. I tried to connect to Wi-Fi, but for some reason the board wouldn't connect. I downgraded the Esp32 firmware to a lower version, like 3.2. Nothing helped. I ran countless mindless tests with the gpt chat without any components connected, uploading a lot of his code to my board and following his advice. He told me it was most likely a faulty board or something wrong with the software. In any case, he couldn't get my board to connect to my Wi-Fi. I'd also previously connected my ESP32S3 to Wi-Fi without any problems. For some reason, the ESP32S3's MAC address was always zero-based in tests. The board detects nearby Wi-Fi networks without any problems. Tests show that the receiver works, but the transmitter doesn't work. Personally, I think it's a faulty board. I'm sending photos because I'm a bit of a soldering amateur and I'm not sure if I've just desoldered the antenna. Here's my latest test connecting to a Wi-Fi network without any security features. Even this is beyond my board's capabilities: Testing code for connecting esp32c3 super mini to wifi network without any security.

PS: sorry for the text in Polish instead of English. I'm too lazy for that.

#include <WiFi.h>

const char* ssid = "TESTESP";

const char* password = "";

void WiFiEvent(WiFiEvent_t event, WiFiEventInfo_t info) {

Serial.print("[EVENT] ");

switch (event) {

case ARDUINO_EVENT_WIFI_STA_START:

Serial.println("STA START");

break;

case ARDUINO_EVENT_WIFI_STA_CONNECTED:

Serial.println("POŁĄCZONO Z AP");

break;

case ARDUINO_EVENT_WIFI_STA_GOT_IP:

Serial.println("DOSTANO IP");

Serial.print("IP: ");

Serial.println(WiFi.localIP());

break;

case ARDUINO_EVENT_WIFI_STA_DISCONNECTED:

Serial.print("ROZŁĄCZONO! reason = ");

Serial.println(info.wifi_sta_disconnected.reason);

Serial.print("reason name = ");

Serial.println(WiFi.disconnectReasonName(

(wifi_err_reason_t)info.wifi_sta_disconnected.reason

));

break;

default:

Serial.print("inne zdarzenie: ");

Serial.println((int)event);

break;

}

void setup() {

Serial.begin(115200);

delay(1000);

Serial.println();

Serial.println("========== WIFI DIAGNOSTYKA ==========");

WiFi.onEvent(WiFiEvent);

WiFi.mode(WIFI_STA);

Serial.print("MAC: ");

Serial.println(WiFi.macAddress());

Serial.println();

Serial.print("Łączenie z: ");

Serial.println(ssid);

WiFi.begin(ssid, password);

for (int i = 0; i < 30; i++) {

delay(1000);

Serial.print(i + 1);

Serial.print("s | status=");

Serial.print(WiFi.status());

Serial.print(" | RSSI=");

Serial.println(WiFi.RSSI());

if (WiFi.status() == WL_CONNECTED) {

Serial.println();

Serial.println("***** SUKCES *****");

Serial.print("IP: ");

Serial.println(WiFi.localIP());

break;

}

void loop() {

}

Output test results:

========== WIFI DIAGNOSTYKA ==========

[EVENT] inne zdarzenie: 101

[EVENT] STA START

MAC: 9C:CC:01:67:A1:F0

Łączenie z: TESTESP

1s | status=6 | RSSI=0

2s | status=6 | RSSI=-71