I am starting off with an Arduino Uno and am able to flash some sketches via the Arduino IDE.
Something confuses me though... When I press the reset button on the board I was under the impression that my currently flashed application is removed. That is not the case. It still executes the last flashed application. Is that supposed to happen?
Also when I flash the "bare minimum" sketch with no code instructions, the on board LED on pin 13 is constantly active. Is that the default behavior?
All that the reset does is restart your application you wrote in the arduino code IDE.
Actually, when you press the reset button, the controller is reset and starts execution at a specified address (the reset vector). In the case of Arduino, the address is in the upper end of the flash memory which contains the boot loader. If the boot loader does not see any traffic in the serial line (i.e. an incoming new program) it transfers execution to your program, i.e. setup(), loop() and the works. The program you load to Arduino is programmed in a flash memory, it does not go away that easily.
That button should be labeled REBOOT. That is what it does to the board.
I added this similar answer because I understand that it' conceptually different to re-run the sketch than reset and startup everything
Related
I am a beginner to arduino and trying to follow one of the videos from youtube to make a project- Master And Slave using HC-05 modules. I followed every step from that video carefully. Here's the link to the video -> https://www.youtube.com/watch?v=BXXAcFOTnBo For Slave Module when I type AT commands in the serial monitor nothing shows up. I searched in Internet for the this problem and still didn't fix it. Here's What i have done:
tired restarting my pc
tried Changing arduino, At first i used arduino nano and then uno
I tried changing the baud rate to all other values and nothing happened
And there is no change in light blink, it stays on AT command mode until power is turned off and on again.
This is how is looks
Thank You For the Answer
Not responding to AT commands is common with cloned HC-05 modules. The biggest reason for this is that the ENABLED pin is not plugged in. Right next to the VCC pin, there is a pin called KEY that should be idle. When you feed that pin with 3.3V, you will see that you get a response to the AT commands. If you don't get any response, don't forget to press the button on the BT Module after making the connection. If that doesn't work, be sure to remove the EN pin and press the button again. You should try these ways until you get a response from the AT command. Every time you write AT on the serial port screen, the bluetooth module will also respond to these requests with the led on it.
I tried to flash an ESP32 but I didn't succeed, I tried with esptool.py and Arduino IDE. I tried to press the boot button and reset but it didn't work. Here is the error:
A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header
If using the Arduino IDE, try lowering the upload speed (Tools/Upload Speed). Lowering mine from 921600 to 460800 did the trick.
First ensure that you are in download mode:
Start the serial monitor and set the speed (mine is 115200).
While pressing the "boot" button, press and release the "en" button (your buttons may be labeled differently).
You should see something like this on the serial monitor:
waiting for download
Now start the upload
My development machine, a 2013 iMac is connected via USB to the USB-c port on my ESP32 Dev Module. Apparently the iMac's USB or ESP32 board's USB cannot keep up at the 921600 upload speed.
DISCLAIMER! May not be correct answer but may help to save time for someone.
Quick answer if you do not want read my experience: Disconnect all wires from pins and try uploading again! It may help.
I came across with the same error and could not figure it out. I first thought that something is wrong with the code, because it happened after I edited working code while figuring out where to connect what pin 😀. I also wasn't able to upload simple HelloWorld after it happened with connected wires. But then I disconnected all my wires from the board and the upload works fine.
I can not figure out the WHY factor but I think it must had been the input/data pin I was using, in my case D13. I have the DevKit with fewer pins. Maybe someone can comment why connected pins may make the error come up?
To make your ESP32 board go into flashing/uploading mode automatically, you can connect a 10 μF electrolytic capacitor between the EN pin and GND. When I had the same problem, when I followed this advice, the problem was solved.
References
Failed to connect to ESP32: Timed out waiting for packet header
espressif/arduino-esp32 - issue
On some AliExpress-like ESP32s you have to press the boot button in order to upload your sketch.
If you are watching the Arduino IDE console ouput and Connecting ... appears, you have to press the boot button for approximately 2 seconds until the console output changes.
Try to do this one after the other
Press the boot button when press uploading button until it write the code.
Try disconnect esp32 from the board/header/pcb that you are using right at the time.
Disconnect any other connection that your esp32 might have.
Do not connect to anything even your hand if possible.
Try put it in something that doesnt have a moist surface. look pic number 3.
MY CASES(30 pin version):
Case 1: I dont know why. I was connecting the pin to a female header it doesnt work and sometimes it just work like that. look pic number 1.
Case 2: when Im holding esp32 on my hand sometimes it wont work then i put it on my table and another time it doing well.
Case 3: pressing boot button when uploading it helped sometimes, and the other time it just work like it should.
Case 4: when it connected to pcb its simply just wont work, but when disconnected boom it work like nothing ever happen. look pic number 2.
Maybe just maybe something with capacitive or something like that (just assuming because number Case 1). hope that will help you out.
pic 1pic 2pic 3
This technique definitely working
Goto Tools > programmer, Select ISP and Upload Your Code.
if you can't see any programmer, then download 1.8.12 version.
https://www.arduino.cc/en/software/OldSoftwareReleases
With Arduino IDE
Make sure the Com port is selected under Tools menu. My experience with ESP32 is Com 5.
If it is not available as an option, try changing USB ports and/or re-select Tools - Board - ESP32 dev module.
Watch the "Compiling Sketch" window.
Press the "Boot" button as soon as you get the red message "Serial port Com 5" You can release the button as soon as it starts to upload.
If this doesn't work,try plugging into another USB port.
The Reset button only resets the uploaded sketch to re-initialise and has nothing to do with the uploading.
Install expressif.exe and port drivers,connect the port and flash the esp32 ,upload the code using ardiuno,solve the error
in my case buttons are new but not shorting properly as multimeter showed ..opened both scratched resoldered and all working
Changing by upload speed from 921600bps to 115200bps fixed it. No need to press any buttons.
Just download the drivers x)
CP210x: CP210x USB to UART Bridge VCP Drivers
FTDI: FTDI Virtual COM Port Drivers
i got a brand new Teensy 3.2 with the blinking LED programm on it.
When I now tried to upload another programm on the teensy, Arduino says:
Teensy did not respond to a USB-based request to automatically reboot.
Please press the PROGRAM MODE BUTTON on your Teensy to upload your sketch.
The automatically starting window of Teensy, doesn't give me a chance to (for example) reboot the Teensy as well, so something of the connection seems to be wrong or something, but what...
Even if I mannualy press the pushbutton, it's still not possible to upload something. Any ideas why?
I have encountered this problem twice. The first I tossed out the board. This time, when I power it, it runs the last program I burned on it, but when I try to program it again, the LED stops blinking and everything stops.
The claim that it might not be a data cable is not reasonable, because how can it stop the current program unless it was told to. I doubt very much that +5V can provide such commands.
I have tried different cables, different USB ports, rebooting my Linux box, reinstalling (twice), checking the pins on the Teensy and the cable... no clue.
It always boots up in the old app (I left the blinker running to indicate "liveness"). I had programmed a message to come out the hardware serial port. Could that have been the problem? Wait... Is there a way to set the baud rate on the USB? I wonder if that is the problem! --
Banner(void) {
Serial.begin(9600);
Serial1.begin(115200);
};
The example had me programming the USB serial! I bet that is the problem! Better yet, does anyone know what the protocol is for talking to USB serial commander?
Under Ubuntu 18.04 install this https://www.pjrc.com/teensy/49-teensy.rules file into /etc/udev/rules.d
We have an arduino pro mini, we are trying to trying to upload sketch the controller but we are prohibited, as the arduino attempt to upload the sketch, it display an error of: not in sync.
We are pretty new in this are, so any help would be much appreciated.
Our setup is:
-Breadboard
-Connection to adapter: USB Serial.
-Arduino Pro Mini as a controller
Through the Arduino Programming Client.
The processor and the port are setup op properly.
The strange thing is, it has worked sometimes these past days..
Much Thanks.
Mieer
Do you push the "RESET" button when it starts uploading? Using the pro-mini probably you haven't connected the DTR pin, so it can't auto-reset the device (so you have to do it manually).
When Arduino starts the uploading phase just press the reset button. It should start.
My Arduino is stuck in an infinite loop trying to read from a pin and print it to the serial console. I can't upload any other programs now. What can I do to get the chip out of the loop?
Remove the USB connection, close the IDE, open the IDE, open BareMinimum, hold the reset button, plugin the USB connection, click the upload button 1/2 a second after removing your finger from the reset button.
If you're using an Arduino Uno, you might want to check out Updating the Atmega8U2 on an Uno or Mega2560 using DFU. Apparently there was a bug in the interface firmware.
This may sounds silly but what about disconnect it from the power supply to reset the MCU?
Edit:
I see it is powered via USB; then make sure you disconnect the device, remove/discharge any battery/capacitors whatsoever. If nothing works, close down the Arduino IDE, change the USB port you are using (sometimes it does happen that they get stuck..), reboot the PC.. Good luck!
Reprogramming the interface firmware (see ViennaMike's response) did not work for me, so I purchased another Arduino and turned it into an ISP programmer and overwrote the offending application:
https://stackoverflow.com/a/8453576/1090713
While this approach had some cost, I now have another tool and a way to save an Arduino in the future.
Upload your boot loader using Avr pocket programmer. This solves your MCU reset.
Use Watchdog timer instruction while coding infinite loop provided you are dealing with critical parameter to be written when it restarts.
If you run across the same problem with Arduino Yun, try uploading empty sketch using WIFI as port. It worked for me when I couldn't upload new sketch via USB.
The Arduino will wait a short while when attempting to upload. So you can press the reset and hold it until the Ide shows attempting to upload. then let go of it.
The problem can be that when you click upload the Ide first compiles then at the end of the process attempts to upload. So pressing reset, clicking compile and immediately letting go of reset doesn't always work because you let go of the reset too quickly.