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Questions tagged [arduino-leonardo]

An Arduino board based on the ATmega32u4 chip with built in USB HID functionality

0
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2answers
23 views

Keyboard.h: No such file or directory - Arduino pro micro (leonardo)

I've just bought a new pro-micro and I want to simulate some keyboard inputs with it, the thing is the Arduino IDE (version 2:1.0.5) can't seem to find neither HID.h or Keyboard.h libraries. The steps ...
0
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0answers
37 views

Arduino Leonardo board - not running or appearing a USB on external power

I've got an Leonardo board, it seems to be official, in that it has the Arduino branding and Made In Italy on the bottom. However I cannot get anything to run with external power supply. Everything ...
0
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0answers
21 views

Question about controlling servos with PWM while being able to accurately read the current from a sensor

Hi I am hoping to design a custom board ATMEGA32u4 with practically a Arduino leonardo bootloader. I plan to control up to 12 servos while being able to read back the current sensor voltage of an ...
1
vote
2answers
30 views

Leonardo - always on power, status remains between computer reboots?

I'm looking for two answer here. Is it possible to power a Leonardo to be always on, separate from the power from the USB host - I've tried with a full size Leonardo and a power adapter but for some ...
0
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0answers
25 views

Have terminal bash script act as virtual “button” for Leonardo?

I've searched quite a lot for this and tried to piece bits of code together but with no luck so far. All i'm looking to do is have a command I can run in terminal/bash script on the Mac trigger some ...
2
votes
1answer
41 views

Triggering a soft reset (Arduino Leonardo)

I want to trigger a soft reset on my Arduino Leonardo, and after some searching settled on using the watchdog timer, as it seemed to be the easiest and cleanest way to do it. However, I don't think ...
1
vote
2answers
223 views

Generated frequency is not as expected

This code sets a pin HIGH for 1 microsecond and then LOW for 1 microsecond. The expected frequency should be about 500 kHz. When measuring the output the frequency is about 96.4khz. Why ? int del = 1;...
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2answers
37 views

Is there a way to traverse a filesystem and read files with an arduino?

I recently got into arduino and I want to set up something big. My project will need the arduino to be able to get into a specific directory of a windows (later may change to linux but for now windows)...
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0answers
19 views

OV7670 doesn't respond with Arduino Leonardo [duplicate]

I'm trying to talk to FIFO-less OV7670 module using Arduino Leonardo. I assembled the circuit by analogy with CumputerNerd's projeject with UNO: in my case, I connected: XCLK ---------------- pin ...
1
vote
1answer
38 views

Help with AlphaNumeric array

I have a Leonardo board and I want to set up my pins to input in one shot using a for loop but the problem is with the analog pins I can't see how to set up a mixed alphanumeric array it gives me some ...
1
vote
1answer
85 views

Is there a board that can act as both a USB host and client for HID devices?

Trying to build an arduino-based Mouse/Keyboard enhancer. This will let me do things like press certain keyboard or mouse shortcuts on the input side, then do something custom on the output side. ...
0
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2answers
29 views

Leonardo Problem

I have boiled this down to a very simple piece of code: int testKey; void setup() { Serial.begin(9600); } void loop() { Serial.println("Input Source ID "); //Ask me the number while (Serial....
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2answers
141 views

Sending a digital signal from one Arduino to another to trigger an event

I am wanting to send a digital signal from one Arduino to another. The goal is for one Arduino send a HIGH signal to a pin on the receiving Arduino. While the pin is HIGH, do function I initially ...
0
votes
1answer
328 views

“exit status 1” error when invoking “useInterrupt” method [duplicate]

for context to this post you can catch up on this post I am working with an Arduino Leonardo and Adafruit Music Maker shield. I am trying to use the startPlayingFile method via the interrupt pin ...
2
votes
1answer
41 views

Specific values not showing when using a numeric keypad

I have attached a 3x4 keypad to my Arduino Leonardo as an input method. Whenever I press the buttons, the majority of the keys work but specific ones don't. Here's my code, I've set it up to beep a ...
0
votes
1answer
73 views

Custom atmega32u4 board crystal issue

So I built an custom board based on the Atmega32u4. Schematics attached. I managed to burn a bootloader for Pro Micro using Arduino Uno as an ISP. The issue I have is that the board is dead when ...
2
votes
1answer
157 views

How can I detect which baudrate a virtual COM port is set to?

I would like my software running on Leonardo to behave differently depending on the baudrate of the USB Serial set by the PC. For example, I want to make a smart USB to UART converter which performs ...
3
votes
2answers
82 views

Stacking 3 of the same shields on top of each other and instructing them in sync

Context: I have an audio track separated into individual channels grouped by frequency and speaker location. I need to play all three of these channels simultaneously and perform instructions like ...
1
vote
1answer
66 views

Serial receiver (Arduino Micro ATmega32U4) in bad state

I have configured two Arduino Micros as a pair of multiplexer/demultiplexers communicating via Tx and Rx. Everything works great except for one little thing. If I reset the sender (multiplexer) the ...
3
votes
4answers
132 views

Where in datasheet is the warning about unreliability of reading PINxn?

I use atmega32u4 (but believe it applies to all models). Here is the datasheet. Consider the following C program (I use AVR-GCC 5.4.0): #include <avr/io.h> int main(void) { PORTB |= 1 <&...
0
votes
2answers
113 views

Do serial ports on Arduino UNO / Leonardo initialize differently?

What are the differences in serial communication between PC <---> Arduino UNO (ATMEGA328p) and PC <---> Arduino Leonardo (ATMEGA32u4)? I am asking because of a problem related to using these ...
0
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2answers
387 views

USB Mouse Passthrough

I am currently doing research for a project of mine. My goal is simple: I want to pass input from a physical mouse, to a microcomputer to process the input and modify, and send the input in the form ...
2
votes
3answers
91 views

DMX on the Arduino without additional driver chip

I recently saw this video where the creator controlled a DMX light via the Arduino. There he used the pins 3 and 4 for the data on the Arduino Duemilanove. As DMX library he used DmxSimple. Based on ...
1
vote
0answers
62 views

Bitmap only displays correctly with PROGMEM keyword

I have a bitmap to draw defined as below. PROGMEM const unsigned char ship1 [] = {0x18, 0x3C, 0x7E, 0xFF, 0x81, 0xC3}; It is then used by the arduboy library's draw slow bitmap function like so: ...
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0answers
41 views

Weird sketch size/memory/compiler (?) related issue (hanging, RX led on)

Also posted at: https://forum.arduino.cc/index.php?topic=549672.0 is there anyone who experienced similar problem or knows a solution to it? The problem is that after uploading the code Arduino Pro ...
0
votes
1answer
142 views

USB upload to Pro Micro (32u4)

My project is based around the ATMEGA32u4 microcontroller. I followed the Arduino Pro Micro schematic to design my own board layout and build a custom PCB, soldered on the components. Then I used ...
0
votes
0answers
98 views

Arduino pro micro might be bricked

I bought an Arduino pro micro (looks like this) from a Chinese seller over E-Bay, for its HID interface. I installed the Arduino software on my Linux machine (Kali Linux), and started writing a USB ...
2
votes
1answer
154 views

Pro Micro recognised as Micro (win10, IDE 1.8.1)

I just got this pro-micro clone 5V and it's my first pro micro ever. After reading lots of discussions about how easy it is to brick and how it's just a smaller Leonardo, I've also found tutorials ...
1
vote
1answer
354 views

Timer0 overflow interrupt not working

I try to use the Timer0 of an Arduino Leonardo (ATmega32u) to trigger an interrupt at regular intervals, using plain avr-gcc (not the arduino library). I try to blink the built-in LED as test, but it ...
0
votes
1answer
191 views

Avrdude can't connect to butterfly programmer

I'm trying to upload my exported HEX file by avrdude using this command /Users/user_acc/Downloads/Arduino.app/Contents/Java/hardware/tools/avr/bin/avrdude -C/Users/user_acc/Downloads/Arduino.app/...
0
votes
2answers
157 views

RFID reader code to identify more than one tag

I'm new to using Arduino and I have managed a few changes to this sketch. But I want to check for a second tag if the first one is not correct. I just can't seem to get it to work. I think it would be ...
-2
votes
1answer
245 views

Can't read JSON data from client (webpage) with Arduino Leonardo ETH

I'm reading a digital pin and count how many times that pin is enable, after that the data is sent in JSON format. All is working well till here. But I want to introduce a value from webpage to ...
0
votes
1answer
1k views

arduino leonardo avrdude: butterfly_recv(): programmer is not responding

I am having issues uploading new code to an Arduino Leonardo board. This happens after uploading a previous buggy code (e.g. array out of range indexing error). Once I fixed the buggy code, I can ...
1
vote
0answers
84 views

Arduino leonardo + OV7670 non-FIFO

I want to transfer image to PC via Arduino leonardo. OV7670 is non-FIFO, and no SD card connected. I followed this blog and this youtube video.using this code. when uplaod, I got errors below: ...
1
vote
1answer
350 views

Failed to initialise SD card on Leonardo

I'm trying to connect SD card reader to my Arduino. For testing i'm running CardInfo example. It seems like it runs ok when I'm running it on my Arduino UNO, but it fails to initialise SD Card while ...
0
votes
1answer
438 views

RX/TX not working as intended

I am currently working on a project with a HC-06 module. I hooked it up accordingly like so: Arduino -> HC-06 5V -> VCC GND -> GND TX -> RX RX -> TX and I ran this code: void setup() ...
0
votes
0answers
278 views

Building a Days Counter with Arduino Leonardo and an RTC 3231

I wanted to make a Valentine's present for my girlfriend by building a days counter since the day we got together. I've been trying to create a days counter that starts counting from a Unix timestamp ...
2
votes
1answer
524 views

Arduino Leonardo RX TX mystery

I'm at the tail end of a project using a Leonardo, a HC-06 bluetooth module and a few cell phone vibration motors. Everything is working fine except the serial communication between the Leonardo and ...
-1
votes
1answer
99 views

Running multiple programs with one Arduino [closed]

Is it a problem to use multiple softwares to read the data that came from the same USB port simultaneously? I have a board connected to a PC by USB, which is read by an application developed in C#. I ...
1
vote
1answer
415 views

Reading Arduino Serial Input

I am reading an input from my Ohaus weighing scale using it's RS232 output using this code: #define HWSERIAL Serial1 void setup() { Serial.begin(9600); HWSERIAL.begin(9600); } void loop() { ...
0
votes
0answers
36 views

How to reset an Arduino sketch using another Arduino? [duplicate]

I had a Leonardo but I wrote a sketch that acts as a keyboard writing "hm", so I am not able to reprogram it with my computer. I have an another Leonardo. How do I erase the sketch from the broken one?...
1
vote
1answer
207 views

DAC using Arduino Leonardo

I am as new to Arduino as it can get. To start off, I am trying to build a DAC using an Arduino Leonardo. I have a digital signal coming from my dual differential comparator. I want to convert this to ...
0
votes
2answers
2k views

Unable to use Keyboard library with Arduino UNO even after changing the firmware

So I'm trying to use my UNO as an HID device. I followed this tutorial, flashed the firmware and got the UNO to be detected as an HID device. However, I am still getting the error 'Keyboard' not ...
1
vote
0answers
182 views

Arduino hardwareSerial Bluetooth.println not sending string over 310 chars

Hey all I am wondering if my code below can be modified in order for the arduino to send more than 300 chars to a HM-10 bluetooth 4.0 le module? #include <SoftwareSerial.h> #define ...
1
vote
1answer
2k views

HM-10 send and receive data and checking received value

I am wondering what is wrong with my code below. I have 2 issues. The first issue, I am checking if c equals "hi" and if it does then display said hi. I currently see the output of c when it hits ...
0
votes
1answer
325 views

How to connect an Arduino via an ethernet cable to a laptop directly?

Maybe a silly question, because it is a usual topic, but I have a problem with my Arduino Leonardo ETH. I want to create a web server on the Arduino with the example sketch File > Examples > ...
0
votes
0answers
93 views

Serial.print / sprintf causes program crash

The following code int i; char msg[16]; // Serial data. Serial.println(); Serial.println("==============="); sprintf(msg, "Sequence: %4d", runNum); Serial.println(msg); Serial.print(...
-1
votes
1answer
124 views

MySensors GatewaySerial code not compiling [closed]

I am trying to compile GatewaySerial code from MySensors library for my Arduino Leonardo and it gives me EEPROM errors. Gateway code: /** * The MySensors Arduino library handles the wireless radio ...
0
votes
1answer
565 views

Programming Arduino with FTDI via Tx and Rx pins

How program Arduino with a FTDI cable/breakout_board via pins 0 (Rx) and 1 (Tx)? In case the USB to UART chip (16U2 or other) is broken, you can program Arduino with a FTDI instead of 16U2 or other ...
0
votes
0answers
179 views

Arduino Leonardo as keyboard installs driver

I want to do some security awareness training within the company I work for. And I want to demonstrate the BadUSB attacks by having some arduino's act as a keyboard and open a webpage, and scatter ...