Upload to UNO R4 WiFi fails: "No device found on ___"

pascaletg · October 26, 2023, 9:40pm

Hi jojo,

Thanks for this. Here are my answers:

The problem exists for all sketches I tried.
I've already tried uploading the firmware as per the instructions in the article, and the firmware keeps installing forever. It never shows "Firmware succesfuly installed".
I'm not sure exactly what you wanted to see under tools but I took 2 screenshots of the "Board" menu. Nothing changes under "Board" or under "Port".

By the way this time it took me about 5 rounds of resets and uploads for the sketch to be read by the board.

Thanks!

ZinggJM · October 27, 2023, 9:18am

Maybe it is the same issue I had. Make sure you never started Serial Monitor, e.g. start the Arduino IDE new, before you select update firmware.

mjolnirjohn · November 4, 2023, 1:03am

Hi All, I have just solved what seems like a similar problem . Ok, first confession, the board involved is a UNO R4 wifi clone, not the real thing, so I don't know if the same problem can occur with the genuine article. So anyway, I noticed initially that sometimes uploading code would fail, but mostly would work after a few tries. But then it stopped working altogether and nothing would fix it. After a lot of messing around I concluded that the problem was that the code already in there was sending serial data pretty well continuously after startup. This appears to have been preventing the IDE from uploading new code. Luckily the code had a check for the presence of the sensor (a Sparkfun magnetometer) before running. So by disconnecting that, the chip would go as far as the check and then halt. Once that was done the upload would proceed fine.

pascaletg · November 6, 2023, 7:53pm

Hi mjolnirjohn,

I wasn't aware that, in order to upload a new sketch, the Arduino has to stop sending data. You normally disconnect the sensors before uploading a sketch and connect them while the sketch is running? Wouldn't it interfere with the sketch if it can't detect the sensor when it starts running?

I thought the point of an Arduino was to quickly be able to test modifications made to a sketch, therefore uploading them right away without disconnecting anything.

pascaletg · November 6, 2023, 8:01pm

Hi ZinggJM,

Thanks for your advice. I tried to update the firmware with an empty sketch as you suggested. Instead of running forever, the updater tells me "Installation failed. Please try again." I just received a new Arduino from the company, and the problems continue.

mjolnirjohn · November 6, 2023, 10:45pm

Normally with other Arduinos (and clones) I have not found it necessary to disconnect any sensors. Nor has it been a problem if the existing code in the chip was already sending serial data. However in this particular case it did seem to be a problem. Fortunately the particular code, a Sparkfun example, checks for the presence of the sensor and halts if it is not found. So you can then upload new code. An alternative work around I saw suggested somewhere is to always put a ten second delay in the setup before the serial data starts, so that you have ten seconds to upload new code before the serial starts up. But if you already have a problem that is a bit late.

nandgate · November 12, 2023, 6:37pm

I have had the Uno R4 Wifi for several months now and have had the issue of the IDE (on Windows 10) failing to upload a program because it couldn't find the com port on many occasions. I have the IDE version 2.2.1 and still get the issue. Attempting to reload several times sometimes works, unplugging the Uno and re-plugging sometimes works, hitting the reset button twice in rapid succession sometimes works, attempting to upload a program with with IDE version 1.8 sometimes works... but nothing works for sure on the first try. In all cases mentioned you have to try multiple times, even spreading the attempts by 24 hours. The one thing those failures seem to have in common is that the serial output line (Serial.print) is doing output at a very high rate. In the case below(original program from Phil Schatzmann that I modified slightly), I did not have the delay(1000) in the loop and it took for ever to be able to upload the next program, I tried many different ways to recover from the upload failure. BTW without the delay, the 'terminal' did not output anything... (also tried Tera, with no output). It looks like the ESP on UnoR4 (handling serial) is too busy... You can try reducing the delay() until the next upload will fail... I hand you the baton or is it a stick of dynamite! The above post by [mjolnirjohn] is on the right track by suggesting a 10 seconds delay is the void setup() routine after starting the Serial port. This way you have a 10 seconds window where you can upload the next program. You could also have something like this in 'setup()':

  while(!Serial) ; // Wait for Serial to be ready
  Serial.println("Input any character to start...");
  while(!Serial.available()) ;  // Wait for user input

#include "FspTimer.h"

FspTimer audio_timer;
volatile uint64_t count=0;
volatile uint64_t start_time=0;

// callback method used by timer
void timer_callback(timer_callback_args_t __attribute((unused)) *p_args) {
  count++;
}

bool beginTimer(float rate) {
  uint8_t timer_type = GPT_TIMER;
  int8_t tindex = FspTimer::get_available_timer(timer_type);
  if (tindex < 0){
    tindex = FspTimer::get_available_timer(timer_type, true);
  }
  if (tindex < 0){
    return false;
  }

  FspTimer::force_use_of_pwm_reserved_timer();

  if(!audio_timer.begin(TIMER_MODE_PERIODIC, timer_type, tindex, rate, 0.0f, timer_callback)){
    return false;
  }

  if (!audio_timer.setup_overflow_irq()){
    return false;
  }

  if (!audio_timer.open()){
    return false;
  }

  if (!audio_timer.start()){
    return false;
  }
  return true;
}

void setup() {
  Serial.begin(115200);
  beginTimer(8000);
  start_time = millis();
}

void loop() {
  // calculate the effective frequency
  float freq = 1000.0 * (float)count / (float)(millis()-start_time);
  Serial.println(freq);
//  count = 0;
//  start_time = millis();
  delay(1000);
}

gamen001 · November 20, 2023, 5:33pm

I have exactly the same problem - sometimes (rarely) it does work, then suddenly not. Running firmware 1.0.5 and IDE 2.2.1
Problem persists with IDE 1.0.8. Other boards (Mega, Micro and R3) are faultless

Grumpy_Mike · November 23, 2023, 5:24am

Try IDE 1.8.19

gamen001 · November 29, 2023, 2:39pm

Done that. Same thing. Tried 5 cables. No ping. What´s happening?? New card .......

dade92 · December 27, 2023, 9:45am

Hi all, just FYI, I experienced the same problem yesterday (with a Mac book pro 2019 and arduino IDE 2.21) when I switched to another cable to upload a sketch. After some research on internet I basically gave up.
This morning I tried again with the "old" cable, and arduino was successfully recognized and I was able to upload everything, probably because that one is a "data" USB c cable.
So, I think that the problem, at least in some cases, could really be the type of cable you are using.. I'm not saying that was the only problem, I'm just saying that before going crazy with USB ports and other stuff, give a try changing the cable

mntlvr · July 21, 2026, 10:10pm

Woke up one morning last week and booted my machine into Mint 22.3
and attached USB cable to UNO R4 WIFI board, and tried to upload a sketch to this board got this message.posted below.
Now day before same machine same OS and it worded dozen of times since I was making changes to a sketch , sketch was uploaded and worked great.
have tried 20 know good sketches now and same error. Have tried every fix on webs sites that show this issue with IDE but nothing makes any difference.
Has anyone solved this issue

FQBN: arduino:renesas_uno:unor4wifi
Using board 'unor4wifi' from platform in folder: /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0
Using core 'arduino' from platform in folder: /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0

Detecting libraries used...
Using cached library dependencies for file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/sketch/A02YYUW_UNO_R4_Water_Tank.ino.cpp.merged
Alternatives for SoftwareSerial.h: [SoftwareSerial@1.0]
ResolveLibrary(SoftwareSerial.h)
-> candidates: [SoftwareSerial@1.0]
Alternatives for WiFiS3.h: [WiFiS3@0.0.0]
ResolveLibrary(WiFiS3.h)
-> candidates: [WiFiS3@0.0.0]
Alternatives for Wire.h: [Wire]
ResolveLibrary(Wire.h)
-> candidates: [Wire]
Alternatives for OneWire.h: [OneWire@2.3.8]
ResolveLibrary(OneWire.h)
-> candidates: [OneWire@2.3.8]
Alternatives for DallasTemperature.h: [DallasTemperature@4.0.6]
ResolveLibrary(DallasTemperature.h)
-> candidates: [DallasTemperature@4.0.6]
Using cached library dependencies for file: /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/libraries/SoftwareSerial/src/SoftwareSerial.cpp
Using cached library dependencies for file: /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/libraries/WiFiS3/src/Modem.cpp
Using cached library dependencies for file: /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/libraries/WiFiS3/src/StringHelpers.cpp
Using cached library dependencies for file: /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/libraries/WiFiS3/src/WiFi.cpp
Using cached library dependencies for file: /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/libraries/WiFiS3/src/WiFiClient.cpp
Using cached library dependencies for file: /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/libraries/WiFiS3/src/WiFiFileSystem.cpp
Using cached library dependencies for file: /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/libraries/WiFiS3/src/WiFiSSLClient.cpp
Using cached library dependencies for file: /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/libraries/WiFiS3/src/WiFiServer.cpp
Using cached library dependencies for file: /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/libraries/WiFiS3/src/WiFiUdp.cpp
Using cached library dependencies for file: /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/libraries/Wire/Wire.cpp
Using cached library dependencies for file: /media/r0b/IDE_PROJECT/libraries/OneWire/OneWire.cpp
Using cached library dependencies for file: /media/r0b/IDE_PROJECT/libraries/DallasTemperature/DallasTemperature.cpp
Generating function prototypes...
Using cached sketch with function prototypes.
Compiling sketch...
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/sketch/A02YYUW_UNO_R4_Water_Tank.ino.cpp.o
Compiling libraries...
Compiling library "SoftwareSerial"
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/SoftwareSerial/SoftwareSerial.cpp.o
Compiling library "WiFiS3"
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/StringHelpers.cpp.o
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/WiFiClient.cpp.o
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/Modem.cpp.o
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/WiFi.cpp.o
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/WiFiFileSystem.cpp.o
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/WiFiUdp.cpp.o
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/WiFiSSLClient.cpp.o
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/WiFiServer.cpp.o
Compiling library "Wire"
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/Wire/Wire.cpp.o
Compiling library "OneWire"
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/OneWire/OneWire.cpp.o
Compiling library "DallasTemperature"
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/DallasTemperature/DallasTemperature.cpp.o
Compiling core...
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/core/tmp_gen_c_files/pin_data.c.o
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/core/tmp_gen_c_files/common_data.c.o
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/core/variant.cpp.o
Using previously compiled file: /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/core/tmp_gen_c_files/main.c.o
Using precompiled core: /home/r0b/.cache/arduino/cores/arduino_renesas_uno_unor4wifi_2db292e8d3afcaf59ae037429c5746f8/core.a
Linking everything together...
/home/r0b/.arduino15/packages/arduino/tools/arm-none-eabi-gcc/7-2017q4/bin/arm-none-eabi-g++ -Wl,--gc-sections --specs=nosys.specs -w -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/A02YYUW_UNO_R4_Water_Tank.ino.elf -L/home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4 -L/home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/variants/UNOWIFIR4 -T/home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/variants/UNOWIFIR4/fsp.ld /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/sketch/A02YYUW_UNO_R4_Water_Tank.ino.cpp.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/SoftwareSerial/SoftwareSerial.cpp.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/Modem.cpp.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/StringHelpers.cpp.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/WiFi.cpp.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/WiFiClient.cpp.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/WiFiFileSystem.cpp.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/WiFiSSLClient.cpp.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/WiFiServer.cpp.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/WiFiS3/WiFiUdp.cpp.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/Wire/Wire.cpp.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/OneWire/OneWire.cpp.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/libraries/DallasTemperature/DallasTemperature.cpp.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/core/tmp_gen_c_files/common_data.c.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/core/tmp_gen_c_files/main.c.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/core/tmp_gen_c_files/pin_data.c.o /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/core/variant.cpp.o -Wl,--whole-archive -Wl,--start-group /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/variants/UNOWIFIR4/libs/libfsp.a /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/../../cores/arduino_renesas_uno_unor4wifi_2db292e8d3afcaf59ae037429c5746f8/core.a -Wl,--no-whole-archive --specs=nano.specs -lstdc++ -lsupc++ -lm -lc -lgcc -lnosys -Wl,--end-group -Wl,-Map,/home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/A02YYUW_UNO_R4_Water_Tank.ino.map
/home/r0b/.arduino15/packages/arduino/tools/arm-none-eabi-gcc/7-2017q4/bin/arm-none-eabi-objcopy -O binary -j .text -j .data /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/A02YYUW_UNO_R4_Water_Tank.ino.elf /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/A02YYUW_UNO_R4_Water_Tank.ino.bin
/home/r0b/.arduino15/packages/arduino/tools/arm-none-eabi-gcc/7-2017q4/bin/arm-none-eabi-objcopy -O ihex -j .text -j .data /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/A02YYUW_UNO_R4_Water_Tank.ino.elf /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/A02YYUW_UNO_R4_Water_Tank.ino.hex
Using library SoftwareSerial at version 1.0 in folder: /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/libraries/SoftwareSerial
Using library WiFiS3 at version 0.0.0 in folder: /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/libraries/WiFiS3
Using library Wire in folder: /home/r0b/.arduino15/packages/arduino/hardware/renesas_uno/1.6.0/libraries/Wire (legacy)
Using library OneWire at version 2.3.8 in folder: /media/r0b/IDE_PROJECT/libraries/OneWire
Using library DallasTemperature at version 4.0.6 in folder: /media/r0b/IDE_PROJECT/libraries/DallasTemperature
/home/r0b/.arduino15/packages/arduino/tools/arm-none-eabi-gcc/7-2017q4/bin/arm-none-eabi-size -A /home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/A02YYUW_UNO_R4_Water_Tank.ino.elf
Sketch uses 81356 bytes (31%) of program storage space. Maximum is 262144 bytes.
Global variables use 10484 bytes (31%) of dynamic memory, leaving 22284 bytes for local variables. Maximum is 32768 bytes.
Performing 1200-bps touch reset on serial port /dev/ttyACM0
"/home/r0b/.arduino15/packages/arduino/tools/bossac/1.9.1-arduino5/bossac" -d --port=ttyACM0 -U -e -w "/home/r0b/.cache/arduino/sketches/4F7238F1B43BA534F31A489DDCDF79B4/A02YYUW_UNO_R4_Water_Tank.ino.bin" -R
No device found on ttyACM0
Set binary mode
Send auto-baud
Set binary mode
Failed uploading: uploading error: exit status 1

ptillisch · July 23, 2026, 6:48am

Hi @mntlvr.

This error might be caused by having the wrong port selected from the Tools > Port menu in Arduino IDE.

Please perform this experiment to verify that the port you have selected is your Arduino board:

Connect the Arduino board to your computer with a USB cable (if it is not already).
Select Tools > Port from the Arduino IDE menus. If one of the ports in the menu is labeled with the board name (e.g., "/dev/ttyACM0 (Arduino Uno R4 WiFi)"), that is the port of your Arduino board.

If you saw the port labeled with the board name in the Tools > Port menu, select that port and try uploading again.

If this doesn't solve the problem, please reply here on this forum topic with the answers to the following questions:

While following those instructions, did you see a port in the Tools > Port menu that was labeled with the board name?
If you did see a labeled port, was the upload successful after you selected that port?

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