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74HC595 chip with 7 segment display constantly displays either all 1's or all 0's

I made a simple circuit with an Arduino Nano ESP32, where I have connected a 74HC595 8-bit shift register chip, as well as a 7 segment display with a 100 ohm resistor on common (cathode) to show the ...
Niko's user avatar
  • 1
1 vote
0 answers
3 views

Linker missing using Arduino IDE

I use the Arduino IDE 1.8.5 and it seems the linker disappeard. The erros messages are: arm-none-eabi-g++: warning: {compiler.optimization_flags}: linker input file unused because linking not done arm-...
Techdoc's user avatar
  • 11
0 votes
0 answers
13 views

Help with PID controller on dual-axis "solar" tracker

I'm working on a dual-axis "solar" tracker for my university. My issue is primarily with tuning the PID that controls output to the two servos. When incrementing the proportional gain, my ...
Austin Seward's user avatar
-2 votes
0 answers
23 views

Problem with movements [closed]

My raycaster is all set but the movement is still not that much good ,left and right inputs are taken continuously without a touch ,if anyone can help me then it will be awesome.so here's the code! #...
Aditya Roy's user avatar
1 vote
1 answer
32 views

Communication between 3.3 V and 5 V system

I am using an ESP8266-01S that only works with 3.3 V power. I want to control a 5 V relay. I gave each component its own power source and got an NPN transistor and wired it like in the diagram, but ...
Samy ashraf's user avatar
0 votes
0 answers
28 views

ESP8266 NodeMCU ESP relay control problem

I'm running into a problem trying to control a relay with ESP8266. The relay works I can manually apply power and hear it click when it turns on/off. I'm taking one of the digital outputs to control ...
Jason Crosby's user avatar
0 votes
0 answers
23 views

Interrupt protection in ESP32 from interference signals

When ESP32 power with external 5V adapter or 12V Power (2596 DC-DC to 5V), and water meter (reed switch) connected with ESP32. The pulse start running wild and kept increasing at each interval (of ...
Just doin Gods work's user avatar
-1 votes
0 answers
19 views

Arduino circuit diagram [closed]

Where can I make circuit diagrams similar to the one below. I tried tinkercad but it didn't have all the components I needed. https://www.hackster.io/monalisa-paul/arduino-bluetooth-car-arduino-uno-...
Khizar Quaid's user avatar
0 votes
1 answer
34 views

Photoresistor reads different values based on program running? [closed]

The project: I automated my mini blinds to open and close based on sunlight. Generic Arduino nano, 2 servo motors run by 2 A4988 drivers to open and close the blinds, 2 limit switches to identify if ...
Starb3an's user avatar
0 votes
0 answers
28 views

How do I connect my Arduino ESP32 to Dropbox using a Dropbox token to upload there a .txt file?

I have an Arduino ESP32-S3-MINI-1 connected to my Wifi. I'm having troubles into connecting it to Dropbox for uploading a .txt file. I've already the Dropbox token, can someone provide me the .ino ...
N.S.'s user avatar
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-1 votes
0 answers
16 views

Adding LCD + Button Shield to Arduino Mega 2560 with W5100 Ethernet Shiled

I bought the W5100 Shield for my Arduino Mega 2560 (https://www.amazon.com/dp/B00HG82V1A?psc=1&ref=ppx_yo2ov_dt_b_product_details). I am using the K3NG Rotator Controller program to make a Ham ...
George Blake's user avatar
-2 votes
0 answers
78 views

Using Timer1 out B for Fast PWM with interrupt on Atmega328P [closed]

sorry if my English is not very good. I have an Arduino Nano (equal to uno, Atmega328P) and i want to use it with fast PWM for audio playback (PCM libraries are not enough for me). I want to use ...
Klymins's user avatar
1 vote
0 answers
19 views

Weird issue with wire.requestfrom() and MailClient.sendMail() on ESP32- rst:0x3 (SW_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)

Update_2: No change after Update_1, same error. I still have to comment either email, I2C, or Temperature out, that the other two can work. Update_1: I'm also using a DS18B20 with #include <...
Christian's user avatar
0 votes
0 answers
36 views

Power supply on Vin for ESP8266 Amica nodemcu v2

My ESP8266 nodeMCU v2 Amica runs fine if I power it from my computer with a micro USB cable. I successfully uploaded a sketch (extended Blink) and it is doing fine. However, if I power the board with ...
Hans St's user avatar
-1 votes
0 answers
52 views

I have a potential button logic problem [closed]

So I am trying to have the arduino start with a press of a button and have it stay on. I also have a calibration function when the button is held down for at least 3 seconds. For some reason, the code ...
Tali Mosley's user avatar
-2 votes
0 answers
26 views

Arduino keeps disconnecting when trying to connect through bluetooth [closed]

I am trying to see if my arduino connects through bluetooth with the lightblue app. One problem is that when trying to connect the attempt keeps failing because the arduino keeps disconnecting. We've ...
Tali Mosley's user avatar
0 votes
0 answers
14 views

Over-the-air Update of M4 (Over Ethernet, actually)

I am installing numerous Adafruit Feathers around my house and property that perform various monitoring and other tasks for me. Uninstalling them and connecting them to my computer for updates would ...
Dave's user avatar
  • 1
-2 votes
0 answers
16 views

Problem with GPS module [closed]

I recently started working with a uBlox Neo 6M GPS module. I connected it to an Arduino Uno as shown: GPS Arduino VCC 3.3 V RX D11 TX D10 GND GND I tried this example code from TinyGps++ (of ...
Saifullahi Aliyu Hashim's user avatar
-1 votes
0 answers
20 views

Stuck connecting Arduino Uno with MCP2515 and SD card reader [closed]

The MCP2515 uses the same digital pins (11,12, and 13) as the SD. How can I share them between the modules ? I am using this to read the data from the OBD2 and display it on the LCD screen (so far no ...
LiiTo Olivera's user avatar
-1 votes
1 answer
12 views

HC-05 bluetooth not working

i connect HC-05 to L293d Driver shield ( vcc to + / Gnd to - / rxd to 1 / txd to 0) but the HC-05 keep flashing red and blue light what does that mean?
rawo's user avatar
  • 1
-1 votes
0 answers
23 views

Why doesn't my RFID work? [closed]

I made an RFID door lock but it won't work. I scanned my card, it shows wrong card. Can someone help me the code is: /*Door lock system code * https://srituhobby.com */ #include <Servo.h> #...
aggelos's user avatar
0 votes
1 answer
33 views

TinyGPS Returning Garbage

EDIT: I switched to TinyGPS++ using the included example, and it's working. Thanks all. Someone more used to StackExchange, please let me know if I should delete this. I have a Neo 6M GPS module. I ...
Jeff's user avatar
  • 101
-4 votes
0 answers
19 views

Density based traffic controller using Arduino..... only default condition working that is round robin [closed]

#define F_CPU 8000000 UL#include <avr/io.h> #include <util/delay.h> #define R1 PD2 // ROAD "A" FIRST SENSOR - RAS1 #define Y1 PD3 //ROAD "B" FIRST SENSOR - RBS1 #...
Srh's user avatar
  • 1
0 votes
1 answer
48 views

Digital pin outs inverting "sometimes"

I have a camera tracking ARUCO markers on a conveyor belt. The camera spots a marker & sends a byte via serial (USB) to a Nano that's, controlling a L298N H-Bridge to change the direction of the ...
DrBwts's user avatar
  • 161
1 vote
1 answer
31 views

Communication between two ESP32, USART vs RS232 with MAX3232

I have two ESP32 that are communicating via USART (TTL) on the Serial2. The TX2 pin of ESP_Alice is connected with the RX2 pin of ESP_bob. The RX2 pin of ESP_Alice is connected with the TX2 pin of ...
Carlo Tavian's user avatar
-1 votes
0 answers
40 views

Arduino Micro Wrong Output

So I am just trying to make a very simple code that will open cmd, make the color green and then run dir/s to make it look like it is doing something. It is a basic school project. But for some reason ...
Erentow's user avatar
-2 votes
0 answers
43 views

Have I bricked my Arduino Uno? Only the TX and ON lights are on and the rest doesn't work [closed]

I saw a video on the Internet where someone had taken out the ATmega328-PU from the UNO R3 board and used it independently. When I did the same thing it didn't work and when I tried using the same ...
WoW TeCh NoW's user avatar
1 vote
0 answers
18 views

Arduino ESP32-S3 MSC FW+Files

I want both, a Config file on the MSC and also FW Update via USB. Right now I can choose on a Hold Button which should be done. But it shows always two Drives instead of one. One Drive is empty and ...
Ripper121's user avatar
-1 votes
0 answers
20 views

Help with object counter

I'm pretty new to all this. So, here's what I'm trying to do: I want to count how many pieces fall into a box using an IR sensor (vester pmi-20-20/p). Once a certain number is reached, I want to ...
Lina's user avatar
  • 1
0 votes
0 answers
24 views

Unable to play audio on ESP32 speaker that receives audio from phone via Bluetooth

I have the following code that I am using to receive audio from phone via Bluetooth Classic and sending it to the internal DAC of the ESP32 which is connected to headphones. When I run this code on ...
Shweta Kiran's user avatar
-2 votes
0 answers
27 views

Query regarding millisecond delay [closed]

In Arduino code, i am putting 10 millisecond delay. instead of 10 millisecond gap, i am getting data in serial monitor for every 30 milliseconds. what is the solution.
Goutham C P's user avatar
0 votes
0 answers
30 views

Transmitting data wirelessly using HC-12

I'm currently working on a project that involves two stations: a transmitter and a receiver. Please keep in mind that I'm a beginner. On the transmitter side, I'm using an ESP32, HC-12 433MHz module, ...
pepin's user avatar
  • 1
0 votes
0 answers
38 views

MP3 player buttons not working

I wanted to create an MP3 player using DFPlayer but because DFPlayer was not available in my area I bought FN-M16P to create the player. The buttons are not working. I used this code when I tried to ...
Yasir Hameed's user avatar
0 votes
0 answers
30 views

What are the limits of Arduino MEGA2560 R2 and R3 compatibility? [closed]

I have an Arduino MEGA2560 R2. It has a program on it that we do not have the source to but want to clone onto another board to troubleshoot certain issues. I have been able to retrieve a hex file ...
elak's user avatar
  • 1
0 votes
1 answer
54 views

Keypad library isn't working or I am wrong somewhere [closed]

I am using PICSimLab to simulate a keypad. The configuration of the keypad is as shown in the picture: and the code is: #include <LiquidCrystal.h> #include <Key.h> #include <Keypad.h&...
ElectronicsBeginner's user avatar
0 votes
0 answers
33 views

Error connection to ESP8266 NodeMCU ESP 12-e

I'm having a problem getting the Arduino IDE to connect to this board: I added the URL for the board manager in preferences: Added the board in the board manager: Selected the proper comport (COM4) ...
Jason Crosby's user avatar
0 votes
0 answers
25 views

How to store a structure of 200 bytes into a external EEPROM? [closed]

I am trying to store accounts into External EEPROM. The struct has 200 bytes but i have read that you can only store 32 bytes at one time. So how do I store a structure of 200 bytes. Is there a ...
jajicek's user avatar
-1 votes
0 answers
24 views

How to upload code in ESP32 - S2?

I am using ESP32-S2-SOLO development module. I just put a simple code to upload. This is my code, void setup() { // put your setup code here, to run once: Serial.begin(115200); Serial.println("...
Kuralmozhi's user avatar
1 vote
3 answers
68 views

Confusing Pinouts on MH-ET ATTiny88

I am a little bewildered about the analog pins on the Arduino ATTiny88. First of all, am I correct in thinking the functions analogRead() and analogWrite() can use either the string A0 - A7 or a ...
LesRhorer's user avatar
0 votes
1 answer
38 views

Arduino Pin Issues [closed]

This is some very simple code I wrote for pin 4 to toggle between on and off every second. However, when I test it, (LED connected to pin 4 and ground), The LED outputs a constant dim glow. This ...
caiamari's user avatar
-1 votes
0 answers
59 views

Controlling DC motors through one single push of a button [closed]

My goal is to write code where when a button is pushed once, the code starts and finishes its cycle (without holding down the button and no click to finish the code). I'm using an Adafruit V1 motor ...
GemmyIsDaBest10 10's user avatar
0 votes
0 answers
20 views

How to send a binary file to a Nano board through an ISP connection using Arduino CLI?

I need to send a .bin File for it to be consumed by InternalStorage from Arduino OTA library. I tried to use Arduino CLIs upload command like arduino-cli upload -i new_version.ino.bin -p AVRISP mkII -...
Andrew's Quest's user avatar
2 votes
2 answers
390 views

Arduino Digispark ATtiny85 conditional logic not working

Expected Behavior: I am attempting to use && or nested if statements to achieve the effect of two switches being required to close prior to an LED light (i.e., flip both switches), the LED ...
jmarywien's user avatar
1 vote
1 answer
56 views

Chrome-sandbox error in Arduino IDE 2.3 in Ubuntu 24.04

I'm trying to setup an installation of the IDE 2.3 in a Ubuntu 24.04 LTS (beta) environment, and am facing an issue I'm unable to resolve. The IDE gets to the GUI for accepting terms and conditions, ...
eccentricOrange's user avatar
-1 votes
0 answers
18 views

ESP8266 post data from MQTT using Node.js

I'm trying to capture my voice using the KY-038 module wired to the A0 pin on the WeMos D1 mini and send it to a javascript file for conversion to wave file format (WAV) so I can play and listen to it ...
MrObscure's user avatar
-2 votes
0 answers
61 views

Help me with my GPS tracker [closed]

I just added an HMC5883L magnetometer to my GPS. The magnetometer reading is not changing when I am rotating it. It is initially wrong as well. Just a detail: the magnetometer is already on a ...
Yug Ahuja's user avatar
0 votes
0 answers
23 views

IMU (MPU-9256) is not working with ESP32 and Arduino Mega

I have been trying to get roll, pitch and yaw data from my MPU-9265 IMU. After trying multiple libraries and changing hardware like wires and ESP32s I was not even able to get a raw readings from my ...
Ajay Adit J 's user avatar
-1 votes
1 answer
56 views

1602 16×2 LCD display is not lighting up for my Automatic watering system project

I'm working on a project to create an automatic watering system using an Arduino Uno R3 board, a 16x2 LCD display, a water pump, and a soil moisture sensor. However, I've hit a roadblock and could ...
Not_Lucky000's user avatar
0 votes
0 answers
36 views

LGT8f328P programming and configuration issues

I am using 40 pin "CNEWTEC BAITE" LGT8F328P processor, LQFP48 Mini EVB modules. These have a 3V3 regulator and 16 MHz crystal. They have no USB interface and I am using an FTDI USB to serial ...
Russell McMahon's user avatar
0 votes
0 answers
34 views

ESP32-C3 - Low Power mode question and suggestion request

I currently have a project I'm working on where I am using the Seeed Studio Xiao ESP32-C3 https://wiki.seeedstudio.com/XIAO_ESP32C3_Getting_Started/ https://www.seeedstudio.com/Seeed-XIAO-ESP32C3-p-...
Mamba343's user avatar

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