Questions tagged [arduino-pro-micro]

The Pro Micro is an Arduino-compatible microcontroller. It is similar to the Pro Mini except with an ATmega32U4 on board. The USB transceiver inside the 32U4 allows us to add USB connectivity on-board and do away with bulky external USB interface.

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31 views

Using Trinket M0 as a raw hid device

I am using Nico Hood's rawhid code to have a micro controller presents itself as a raw hid device to the PC. This works splendidly when I use it on an Arduino Pro Micro. My linux kernel will report: ...
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2answers
166 views

Digital Input using a button doesn't work properly when using it to control a relay

I'm trying to control a relay both via Bluetooth and using a switch. The problem is that, when the LED is off, I can turn it on with the switch but then if I turn off the switch the relay will stay on....
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1answer
213 views

How to fix HC05 burning even after while using voltage regulator?

I'm using two circuits for my wireless head mouse project, one of them is a transmitter circuit with Arduino Pro Micro, HC05 Bluetooth module, Elechouse Voice Recognition Module V3.1, GY-521 module ...
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1answer
54 views

Peculiar behaviour of arduino pro micro

I am working with an arduino pro micro and I am facing a peculiar problem. The project I am working with includes arduino MKR NB 1500 as well. I am transferring data from MKR NB 1500 to arduino pro ...
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1answer
91 views

Pro Micro board not responding to anything

I just got a couple of Arduino Pro Micros for a custom keyboard build. Before testing them with the Arduino IDE, I tried to test them with qmk by shorting RST to GND to try and flash it. After a few ...
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1answer
654 views

Measure lipo voltage while powering arduino

I have a arduino pro micro 5V that I want to power with a 3.7V lipo. I also have a charging module to charge the lipo. (https://www.banggood.com/nl/TP4056-1A-Lipo-Battery-Charging-Board-Charger-...
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1answer
86 views

Mounting an Arduino inside a PC

I want to mount an Arduino Pro Micro inside my PC, hooked up to the PC's USB. I don't want to have external cables for this, but have it neatly cabled inside. My motherboard has USB connectors with 9 ...
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3answers
395 views

RFID stops working when I place the servo

I've successfully implemented Door Unlock system described in this tutorial. At first I used Arduino Uno and RFID RC522 Reader and MG90S Micro servo. When I used Arduino Uno with Arduino Pro Micro ...
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130 views

Gamepad connection using Pro Micro(ATMEGA32u4 + HC-05

I have been working on making a HID compatible Gamepad using Pro Micro and HC-05 module. I have successfully configured the class of HC-05 module to appear as an Input device(A gamepad) on my PC ...
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2answers
1k views

Arduino Pro Micro not recognized by PC

so I've got myself a Arduino Pro Micro ATmega32U4 5V 16MHz and my PC (Win10 64bit) won't recognize it. So, after I firstly plugged it in, it was detected as a Leonardo, rather than a Pro Micro, ...
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36 views

What is the timing between reset and avrdude/spi communication? (re: avrdude problem)

I'm trying to troubleshoot an issue with avrdude involving a Raspberry Pi and a transistor to control the reset pin on an Arduino Pro Micro (atmega32u4). Where can I find information on the reset/...
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12k views

Send Keyboard Media Keys with Keyboard Library

I have an Arduino Pro Micro (ATMega32u4) that I want to use as an IR receiver for a media PC and need to send codes like Volume Up, Media Home, Play, etc. But when I look up the scan codes for those ...
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298 views

How can I add a potentiometer and more buttons to my custom game controller?

I'm new to using Arduino, and know next to nothing about programming. I'm currently trying to add a potentiometer, and possibly a few more button inputs to my 3D-printed guitar controller project It ...
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1answer
59 views

Sharing clock pin on Pro Micro

I am trying to get both a SPI LED matrix display and an NRF24L01 to both work on the same Arduino Pro Micro. I know they both want to use the clock pin but how do I get them to share? Can I use the CS ...
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2answers
7k 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 ...
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44 views

Use HC05 and FTDI as Slave to Connect to control PC using HC05

Hi i just wanna ask if its possible to do this on HC05. So i can send some keyboard function? and if yes can you tell me how. Thanks
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1answer
155 views

Arduino Pro micro Serial communication problem with Node MCU

I recently bought an ATmega32U4 based Arduino Pro micro. I am using the Keyboard library and interfacing with my PC via USB. I am trying to create a serial communication between the Arduino Pro micro ...
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1answer
78 views

Pro micro Wire.endTransmission() does not return

I have an Arduino Pro Micro(blue version) and I'm having trouble using the I2C. To test it, I use the code below and the result is an infinite square wave on SCL and SDA lines and I only get the ...
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2answers
4k views

Arduino Pro Micro bricked?

I have a Pro Micro board at which tried to upload a sketch with sparkfun's Pro Micro 3.3v processor selected. After the upload completed successfully the board did not run again and is not even ...
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1answer
236 views

Upload s sketch to a 5v Pro-Micro board as 3.3V by mistake

I have 2 types of Pro-Micro(as shown here), both 5v, micro-usb, which worked as expected, until, accidentally were flashed as 3.3v using the Arduino IDE. At first I thought that the fact it stoped ...
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2answers
7k views

Can't upload sketch - avrdude: butterfly_recv(): programmer is not responding

I'm trying to upload a Blink example to run on a pro-micro (leonardo) but it is not working anymore (it was just working yesterday). Steps to reproduce: Plug the device in USB port Open Blink ...
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4answers
378 views

Can I control LED brightness with potentiometer without any code, as well as reading the potentiometer value?

I am just getting back into electronics and have started to play around with making my own button box. I am trying to control an LED's brightness using a potentiometer, while also reading the ...
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1answer
34 views

How do I add or subtract to a pre-determined value without having it default back to the original value?

Typical apologies in advance, it's been quite some time since I've tinkered with Arduinos. Using an Arduino Micro Clone (Pro Micro), TF02 LiDAR, and a Adafruit 1.2" 7-segment display, I've been ...
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41 views

Copy outbound data of Serial to Serial1 for Pro Micro

I am working on a bluetooth HID device. There are libraries which make HID devices a cake walk if you are making a wired version of your HID device. I managed to configure my bluetooth module to ...
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2answers
2k views

Arduino reads hc-05 device connecting status

Hello I want to get an arduino get status of bluetooth hc 05 if connect with device or not . I'm trying by myself and search on internet website but I can't find useful things.
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623 views

Arduino Joystick Library not Recognized by Games (Steam)

I have an Arduino Pro Micro running code that uses the Arduino joystick library to act as a gamepad. I'm just doing testing right now so there's a single button wired up and configured in the code. ...
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1answer
173 views

ISR Issue: Arduino Pro Micro

I'm trying to do a small test where I am using the ISR on the Arduino Pro Micro it up from sleep mode. I'm using a Force Sense Resistor (FSR, a resistor that changes it's resistance depending on how ...
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1answer
291 views

What does a tilde (~) mean as annotation for a data pin?

When I examine the datasheet for the Arduino Micro (couldn't find the Pro Micro on their site, btw) then I see some data pins annotated with a ~ character, and some are not. For instance, D9 has a ~ ...
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1answer
506 views

Self made ATMega32U4 board first programming

I'm stepping into Arduino world and decided to build a small board to implement a gamepad. Prior designing the board I tested my firmware on a Arduino Pro Micro USB so I decided to make something ...
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1answer
900 views

No ttyACM0 with Pro Micro on Ubuntu 18.04

I am trying to determine the dev path of a USB keyboard running an Arduino Pro Micro on my Ubuntu 18.04 system. The files /dev/ttyACM0 and /dev/ttyUSB0 do not exist. When I run dmesg I get: [ 410....
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1answer
299 views

Establishing wireless comm. between PC and arduino pro micro to exchange speech and gyro data

I have a client project to make a wireless head-mounted mouse. What wireless module should I use so that I can exchange data between my laptop and the arduino pro micro through the USB port like a ...
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1answer
136 views

fixing drifting issue for elechouse voice recog module v3.1 and MPU6050 sensor for head mouse even after doing sensor calibration?

For my head mouse project which is based on the voice recognition module V3.1 for left click, double click, right click operations, MPU 6050 accelerometer and gyroscope for cursor movement, I am ...
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2answers
3k views

I can not upload hex files outside of the Arduino IDE to my Pro Micro

I have a strange problem. I am trying to upload a .hex file to my lovely Arduino Pro Micro, but am unable to do so. If I use the Arduino IDE, it goes through perfectly fine and uploads the sketch. ...
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1answer
71 views

Cannot write lock byte on Arduino Pro Micro

I have an Arduino Pro Micro, with atmega32u4 chip and a caterine bootloader. However, every time I (successfully) flash some program over the USB port, the /dev/ttyACM0 device disappears, and I cannot ...
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2answers
948 views

Read battery voltage from battery which is powering arduino

I have a 5V arduino pro micro. I want to power it with a 3.7V lipo. Should I use a step up module to convert it to 5V? I also want to measure the voltage of the battery. How can I do this? ...
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1answer
554 views

How to use power led from arduino-pro-micro?

In my project I need 3 leds. I would like to use on-board leds if possible. I know how to use PB0 and PD5 red on-board leds, and I would like to hack the board somehow to use the green power led. If ...
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0answers
263 views

ATMEGA32u4 Arduino Bootloader Issues

I've been struggling with this issue for a few days on and off now.  I made a custom PCB (schematic) for a smaller Arduino Pro Micro and it works - mostly.  The only issue I had was that the pins on ...
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1answer
25 views

Cryptic compiler errors

I'm getting the error: left_hand:3:20: error: expected ']' before ';' token #define HAND_ROWS 5; ^ on this code: #include <Keyboard.h> #define ...
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1answer
280 views

Sparkfun Pro-Micro stuck on uploading

I have read multiple posts on how to reset the sparkfun pro-micro when it gets stuck during upload, and this seems to work to get it back to a state where I can upload new code again - However, I am ...
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3answers
323 views

How do I change pin assignments for the LUFA AVRISPMkII?

I just managed to get Dean Camera's LUFA AVRISP clone working on my Arduino Pro Micro, when to my dismay I found that to use PDI for my XMega, I need to have PD5 exposed for the clock source! The Pro ...
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0answers
32 views

How to fetch the com port or any id I can use to upload specific program to a specific arduino? e.g. "a.ino" to arduino micro

My project is a head mouse for which I am using two arduino boards . I want to upload a specific program to a specific arduino. How can I do it? And if I need to use a pid or com port id about which ...
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0answers
45 views

Where do I get the wider arduino pro micro from?

I have a bunch of boards already fabricated for a game controller that uses the arduino pro micro. I ran out of the arduinos and ordered more. But the new ones are 0.6" wide from pin to pin, and my ...
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1answer
190 views

USB DEVICES WITH THE 32U4?

I have an Arduino Pro micro and I need to know if it is possible to use an USB device like a camera or things like that Since the processor is a 32U4. the USB Shield is for the Arduino Uno and I don't ...
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5answers
38k views

Arduino Pro Micro, get data out of Tx pin?

I have a Sparkfun Arduino Pro Micro with an ATmega32u4 on it and a Roving Networks RN32 Bluetooth Module Theoretically, I should be able to solder the Rx of the Bluetooth to the Tx on the arduino and ...
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3answers
985 views

What can I do to increase the amount of LEDs I can power with a pro micro?

I am new to arduino and have a sparkfun pro micro that I'm using to power a one meter (60 pixels) APA 102 strip. I currently power it via USB and have a program that sends lighting instructions to it. ...
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0answers
58 views

Arduino pro micro crashing

My arduino pro micro started behaving weird. I noticed it had crashed with very simple code on it (basically just two lines of fastled code followed by a delay. Then it didn't appear as a USB device ...
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1answer
155 views

3.3v pin on a 5v Pro Micro?

I have a arduino pro micro that runs on 5v. I also have a Max4466 that needs 3.3v, however the pro micro doesn't seem to have a 3.3v VCC. Is there any way to attach the max4466 to the Board?
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2answers
127 views

Compile error in Ubuntu 18.04

I'm trying to compile a code to arudino pro micro, I have the right option for compiling like the port and the type of the board,but I get an error,I can't copy
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2answers
309 views

LSM9DS1 breakout - How to increase speed

With regards to the Adafruit LSM9DS1 breakout: enter link description here And using the Library: enter link description here I am trying to increase the sample rate, or speed of this chip. I am ...
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1answer
1k views

Rotary encoder using interrupt

This is my first time working with a rotary encoder and interrupts. I am using a Pro Micro which has interrupt pins at pin0 and pin1. The code below works as expected. My question: do I need to use ...