Questions tagged [atmega32u4]
The atmega32u4 tag has no usage guidance.
56
questions
9
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1
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What does a USB device need to do so that the host device can sleep?
I am using an ATmega32u4 that is connected semi-permanently to a mobile Android device (specifically, a keyboard connected to a phone).
While the device is connected and USB is enabled on the ...
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0
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0
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36
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ATMEGA32U4-AU Schematics Sanity Check
I had previously asked a few questions about ATMEGA32U2 and got great feedback. I updated my schematics and went ahead to order, only to realize that JLCPCB is currently out of ATMEGA32U2. I have ...
- 115
1
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0
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38
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Open-Source Temperature Logger (HELP)
I am almost finished with the development of an open-source temperature logger (USB + battery powered). I have built the PCB using ATMEL ATMEGA32u4 with feather 32u4 bootloader (3.3V 8MHz). Its an ...
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0
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1
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82
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ATMEGA32U2 Schematics Sanity Check
I am not certain if this is a thing, but I was hoping for some members to sanity check the below schematics I have for an ATMEGA32U2. The external LCDs the ATMEGA32 is communicating with are TTL and ...
- 115
0
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1
answer
174
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4 Layer PCB layout with microcontroller and IMU
I'm trying to design a 4-layer PCB board and would like to check if the following layout will perform well. By well, I mean if it will perform optimally. Factors such as Low EMI and noise coupling etc....
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0
votes
2
answers
64
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ATMega32U4 USB design considerations
I'm desigining a board with ATMega32U4 microcontroller.
The board will be minimal, and will feed the microcontroller from USB of an M.2 socket (E type) on a PC mainboard:
Now, checking Leonardo's ...
- 947
0
votes
2
answers
213
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Schematic design for CJMCU Beetle?
I have this bare ATMEGA32U4 breakout:
There are no components on the backside, and I need to redesign this for my own purposes.
I'm looking for the schematic design of this. Although I can reverse ...
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1
vote
2
answers
212
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How to make a MAX98357A class-D amplifier work with an Arduino (ATmega32) to play an audio file?
Is it possible to make a MAX98357A class-D amplifier work with a normal Arduino? I've only found solutions based on an ESP32. If not, why not, and is there a solution or an alternative solution?
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0
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76
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Control Neopixel with SPI on an ATmega32U4
I want to control one Neopixel using an ATmega32U4 (only one, so there is no problem with chain timing propagation). With the bit-banging library it does work great, but I want to use the SPI to free ...
0
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2
answers
485
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PCB design review (ATmega32U4 keyboard PCB)
I've been working on an ATmega32U4-based PCB for a custom keyboard for a while now. I made a few prototypes with similar designs, but they all seemed to have issues with the microcontrollers dying ...
0
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2
answers
261
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32u4 not recognized by FLIP
I recently built a custom PCB with a ATmega32u4. When I plug it in to the USB port it is recognized by windows in the device manager as "ATn32u4DFU". I however can not open a USB port ...
0
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0
answers
405
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ATMega32u4 power consumption with CLKDIV8
I have a little board with an ATMega32u4, that's run straight off USB voltage. There are no peripherals on board that should draw power (no LDOs or anything, LED is off).
It has a 16MHz crystal.
The ...
- 857
1
vote
1
answer
744
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Connecting USB-C port with ATmega32u4 - Questions
I'm a beginner when it comes to schematics. I'm attempting to create a USB-C + Atmega32u4 schematic. Later I will add cols and rows for keyswitches (usb keyboard).
Below is the schematic I came up ...
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0
votes
2
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250
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How to test if a ATMega16u2 is working
I have designed a custom ATmega16u2 board, however, I cannot connect to it using USB.
All connections seem to be correct, and I have checked that the voltage regulator is working, regulating it to 3....
1
vote
1
answer
268
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ATMega32u4 minimum system clock for USB 2.0
I am trying to cut down the power consumption for an ATMega32u4.
The datasheet says, for USB 2.0 it needs an external clock, which it uses to generate a 48 MHz clock by multiplying the external clock ...
- 857
2
votes
1
answer
131
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Strange ATmega32 behavior with assembly code
I posted a kind of similar question recently, but it was not that organized, so here I am trying again :)
I wrote this short assembly code to blink an LED at different intervals depending on the state ...
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2
answers
351
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AVR reset pin capacitor causes chip to enter bootloader on powerup
I have a circuit using an ATmega32U4 and am using the Arduino Leonardo/Micro Caterina bootloader (the one that comes with arduinoIDE v1.8.13). The problem I am having is on power-up (via USB ...
- 171
3
votes
1
answer
1k
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ATmega32u4 reset circuit and bootloader
I have an ATmega32u4 which I have configured to run its application by default at boot, and to run the bootloader (standard DFU USB bootloader from Microchip) when the reset button is pressed. I ...
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0
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1
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220
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ATmega32U4 I/O Pin Alternate Functions
I am using an ATmega32U4 as a master with 2 slave ADCs (AD7739), ADC1 and ADC2. The two ADCs are identical. The SS, SCLK, MOSI, and MISO for ADC1 correspond to ports PORTB0,1,2, and 3 respectively, ...
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2
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4
answers
1k
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PCB design review (ATMEGA32U4)
I have been trying to make a watch for the past few months, but all my prototypes have been unsuccessful.
So, to try ironing out some problems, I made a practice PCB to try testing my base Atmega32u4 ...
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0
votes
3
answers
232
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Does a USB port provide enough power for my LED project?
I'm not quite sure whether or not my LEDs will draw too much current. I can't put the schematic right now, but basically I'm using just using the power line from the USB 2.0 port on my board, and it ...
1
vote
0
answers
120
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Feather 32u4 too much current draw
I am trying to build a battery-powered application using the Feather 32u4.
I need a timer to trigger every 120 seconds (although Timer1 with it's 8 second limit would suffice for the beginning), thus ...
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1
vote
0
answers
79
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ATMega32u4 Timer code not working
The following timer code running on a 8Mhz ATMega32u4 should toggle the onboard LED every second, and calling the ISR code manually does so. Yet, the ISR does not seem to get called.
Could anyone ...
- 39
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votes
0
answers
85
views
How to change LUFA default 8MHz crystal setting?
I have an Atmega32u4 micro controller with minimum hardware design. It has an embedded USB compatibility which can be enable/used with some software like LUFA.
Everything works fine (the computer ...
- 1
0
votes
0
answers
29
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32U4 based board sometimes does not run setup
I have a custom PCB using 32U4.
Sometimes when I switch the board on, the code of setup() function does not run. But this is quite unfrequent, the board usually works fine. This just happens from time ...
- 41
0
votes
0
answers
99
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Issue with daisy chained arduinos and serial communication
I have a setup with a 32U4 based board and 2 daisy chained 328p based boards.
Boards are connected via 4 wires : VCC, GND, TX, RX
32U4 is powered by USB
Daisy chain is :
...
- 41
2
votes
1
answer
195
views
Can't program ATmega with ICSP on custom pcb
I'm fairly new to PCB design, and I've been trying to program the microcontrollers on the board I designed with no luck. The board uses an ATmega32u4 and an ATmega328P. I've been trying to program ...
- 21
1
vote
0
answers
72
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Bidirectional logic level converter with voltage regulator and 5 volt microcontroller
I have to use an N-channel enhancement mode Mosfet based Bidirectional logic level converter along with a fixed 3.3 voltage regulator along with 5 volt micro controller. I am powering the low voltage ...
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0
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0
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179
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Atmega16U4 (Hardware USB) does not show up as DFU device on device manager
I am trying to get the Atmega16U4 to show up in windows device manager. Right now, when I connect the atmega16U4 through USB to the computer it does not do anything (does not even play the USB ...
- 15
0
votes
2
answers
167
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PCB with multiple Arduinos and onboard hub
I'm designing a PCB for an astronomical observatory which needs several Arduino Micro to control different devices. Since the circuit must fit a very small space, I'm putting an onboard USB hub to ...
1
vote
1
answer
106
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Cannot connect Arduino Uno REV3 ATmega16u2 serial connection to outside serial connection
I wanted to simply use the ATmega16u2 on my official Arduino Uno with a serial connection.
I connected my Serial Board (where I can simply connect any serial connection and read it on my PC via Putty)...
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1
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0
answers
2k
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Why is my atmega32u4 not showing up as a USB device
I have an atmega32u4 as part of a PCB that I designed. The atmega32u4 comes with a USB bootloader and so I should just be able to plug it into my USB port and have it show up as a device. It doesn't ...
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173
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Can I communicate with an Atmega32U4 through USB during runtime?
I'm designing a PCB circuit to do PID control using sensor data to control a robot. I'm new to using micro-controllers other than Arduino and I'm having some trouble figuring out exactly how ...
- 71
0
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1
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493
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How do I program an ItsyBitsy 32u4?
How do I load code onto a ItsyBitsy 32u4 without using the graphcial Arduino IDE?
I've looked for "ItsyBitsy 32u4 programmer" and ItsyBitsy 32u4 bootloader".
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1
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985
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Atmega32u4 USB and USART
I have an ATMega32u4.
My question is about the bootloader section. How does this device pretend to be a com port while connected to USB? What makes the computer think it is a com port and how can I ...
0
votes
1
answer
284
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Atmega32u4 constant `1023` reading on ADC Channel
I can't share the schematics as they are not mine, I'm trying to add an analog thumbstick (4 pins, Vcc/GND/x/y) to my atmega32u4 powered keyboard.
The thumbstick pins are connected to pins PB4 (ADC11)...
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1
vote
2
answers
660
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Can I use the internal Atmega32u4 clock for USB applications?
I believe I can set a fuse in the atmega32u4 to tell it to use its internal clock rather than an external crystal.
Would the internal clock be acceptable for using the microcontroller as a USB HID ...
- 714
0
votes
3
answers
902
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What fuse to set to enable 16MHz clock on the atmega32u4
It's my first time attempting to program an Atmega32u4, or any microcontroller for that matter, on a custom board I got printed.
avrdude has a weird output when I, for example, run this command: <...
- 714
1
vote
1
answer
845
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Issue with programming Atmega32u4 (lfuse memory not accessible using FLIP)
From my last question, I've managed to connect my Atmega32u4 to my computer.
Now, when attempted to initialise the bootloader using avrdude, I get the following error message:
...
- 714
2
votes
2
answers
10k
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How can I program an Atmega32u4 over USB with this schematic?
This is my first time trying to program an Atmega32u4. I made a PCB with the following schematic:
Now I've soldered all the parts onto the PCB, and I've plugged a micro usb cable from my computer ...
- 714
0
votes
2
answers
378
views
ATmega stopped working after changing CKDIV8 fuse
I have ATmega32U4. I connected it via SPI programmer and in Atmel Studio I have read their signature properly. It was working. Then I cleared and programmed CKDIV8 fuse. Clock was set to internal RC. ...
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1
answer
1k
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Help with Atmega32u4 custom PCB
I have attempted to design my own custom Atmega32u4 board, but when I assembled it it didn't show up in windows device manager. I fixed the problem where I forgot to connect VBUS to VCC with a jumper ...
3
votes
1
answer
1k
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ATMega32u4 VBUS and SMD Schottky Diode
I have spent quite a bit of time trying to work this out, but I just can't. I want to power my ATMEGA32U4 chip via USB, and at the same time send that USB +5V off to the circuit +5V bus per the ...
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2
votes
1
answer
179
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Atmega32u - Ground in bus powered configuration
The Datasheet provides an example configuration for when the device is powered from the bus, and shows the bus Vss connected to ...
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0
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1
answer
81
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Why PINxn with pullup reads zero when nothing is connected to it?
Consider the following C-program:
...
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1
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436
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Will other devices interfere with programming a ATmega32U4 if attached to SPI bus?
I’m designing a custom PCB around an ATMega32U4. The 32u4 will talk to another onboard component via the SPI bus. Since the SPI pins (MISO, MOSI, SCK) are also used for ISP programming could other ...
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0
votes
1
answer
1k
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Is my PCB layout ok? (ATMEGA32U4, WizNet W5500, Ethernet)
I want to design a device that listens to certain network communication and calculates a MIDI clock signal out of this information. The MIDI output is via classical MIDI port or via USB MIDI.
I am ...
- 127
0
votes
1
answer
402
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i2c interference on coiled wire
Hello good day I been trying to build split keyboard using 2 pro micro.
I'd been following let's split keyboard using qmk firmware.
And the connection diagram of the i2c is this
When doing it on ...
- 101
0
votes
1
answer
95
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Atmega32u4 Pin F0 output is only 3.64V, not 5.00V
Unlike F4 which outputs 5.0V, my F0 pin only outputs 3.64V.
Is this normal?
This is my code:
...
- 983
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1
answer
813
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4n25/35 optocoupler detect led on/off
Hey all i am just wondering if my drawing below is correct in order to have an arduino detect an on or off led on another board using a optocoupler?
My thoughts of the above drawing is that when the ...
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