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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.

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.

132 questions
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Arduino Pro Micro - switch off LEDs

I am using a Arduino Pro Micro as a keyboard (USB HID device). Each time I press a key, the RX LED and TX LED light up. Can I switch them off in software?
qubit
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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 example in Arduino IDE (version 1.8.8) Select the port…
Fnr
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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 working right after, has nothing to do with that…
guyd
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What are the current limits on an Arduino Micro?

Just to make sure I don't set my board on fire, is there any information out there about the maximum current per pin/pin group on an Arduino Micro? This page states I can get 40mA per pin, but are there limits on group of pins? As stated here,…
debgz
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I'm new here. Where to look for documentation for my specific board

sorry if this isn't the done thing. I have a little red space invader shaped board that has an arduino chip on the back from a conference. There is an LCD display and I've just got it to function correctly (there was a power issue. ATE1…
shmink
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Pro Micro - Measuring voltage between two pins, without using GND

Quite new to this but making pretty good ground. I have an issue I'm not sure how to solve. I want to add a Pro Micro to an RC Toy, I can easily power it from the toys GND and 5V power. But then I want to use the voltage going to an LED on the toy…
l0gic
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Error opening serial port 'COM1'. (Port busy)

Im using the arduino Micro pro to read the data out of a temperature sensor (lm35). The program is compiling and NOT uploading, but when I try and open the serial monitor is says: Error opening serial port 'COM1'. (Port busy)
M. Shaaban
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Problems with (somewhat) large boolean arrays

I am writing a simple Conway's Game of Life implementation just to get to grips with the "Nokia 3310" LCD and I am having problems with boolean arrays. I am using an (unofficial) Arduino Pro Micro 5V/16MHz Here's the code that is causing me…
Sunbart
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I can't get my Micro Pro to bootloader mode anymore

It's important to start by saying that this micro was working perfectly, and the keyboard I built with it was great. Then this happened: While using the QMK Toolbox I tried to upload an oversized .hex file, and since it was taking too long, I hit…
Deleteman
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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 seconds of holding RST, I got a single blink and…
ChocolateOverflow
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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 pin to turn off one device while trying to use…
Ben Crawford
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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 working on a rangefinder that is able to be adjusted…
Suspicious Soup
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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 on my macbook anymore. I reset it (pulling the rst…
Julian Finn
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Arduino Pro Micro clone clock cycle issue

I have several Arduino Pro Micro clones that are giving me an issue where they work immediately after being programmed while the USB cable is still connected, but as soon as I disconnect and reconnect the USB cable the program fails. I was able to…
getSurreal
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Cryptic compiler errors

I'm getting the error: left_hand:3:20: error: expected ']' before ';' token #define HAND_ROWS 5; ^ on this code: #include #define HAND_ROWS 5; #define HAND_COLS 6; #define ROW_PINS {9,…
Lowell Camp
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