I have an arduino uno R3. I am able to upload the programs with no connectivity issues. But there is a problem while executing the program and I don't know what that is. The 13th pin led is not blinking as the default bootloader program comes with preloaded blink program. I am not able to reset the board too. What might be causing the problem?
I even tried to reload the bootloader program. But the same think happens yet again.
Thanks in advance and Regards,
Rishi.
Have you tried to blink one led with pin 2 or 3 ( any of the digital pins ). You might have a working Arduino uno but your led on the board can be broken.
Otherwise,you should try to flash the bootloader with a secondary arduino and check if you get the same issue.
Related
i already tried using this board and all works fine but suddenly one relay has a dimmer turn on led and the relay doesn't have a clicking sound when turning on. Then one after another all 7 relays has the same problems, i tried changing may atmega chip but nothing happened. I tried using other power supply to power the 7 relay but still the same. The digitalwrite(n, HIGH) output voltage of the atmega pins that are connected to the relays is just about 1.7v and not 5v but the other ouput pins that has nothing connected has 4.89v output when turning it high, would that be the problem? And how would i fix it? My code i use to troubleshoot is just high and low digitalwrite.
Schematic Diagram
atmega328p with built-in 7 relays
I'm using an ATmega328p microcontroller with the optiboot bootloader.
Optiboot is configured to flash a "start LED" for 3 times when optiboot is running.
Fuse bits are set for a bootloader section of 256 words and BOOTRST is programmed to jump into the bootloader section at start-up.
With the bootloader installed, I flash the actual firmware via the UART (pin 30 and 31) and that all works fine.
Now to my question:
When my firmware is running and I pull the reset line of the atmel to GND, I can see the "start LED" flash 3 times and then the firmware execution starts. This tells me that the bootloader run right after the reset.
However, when I start-up the atmel (supply power to the chip), I do not see the "start LED" flash 3 times and the firmware code seems to be executed right away.
Does anyone have an idea why optiboot flashes the "start LED" after pulling the reset line to GND and not when I power-on the chip?
The reset line is directly connected with a 10k pullup to the supply voltage of the atmel.
I hope someone has an explanation and any help is much appreciated.
i think it's relevant ,
"On reset, Optiboot starts and reads the reset reason from MCUSR. For any cause other than "external reset", the application is started immediately. Otherwise, optiboot attempts to download new application software"
I have just finished a project using an Arduino Micro dev board and want to move to a standalone ATmega32.
I need to run this at 3.3V and I dont want to go down the overclocking road so I have an 8MHz crystal to put on it.
I still want to be able to upload sketches via USB and the Arduino compiler so I gather I need to burn a different bootloader.
For this purpose I have purchased a USBASP programmer.
I am slightly unsure of what to do next - everything I can find on the topic either relates to the ATmega328 or to burning bootloaders using another Arduino.
I have worked out that I need to modify boards.txt to point to the correct bootloader....but which is the correct bootloader for ATmega32 at 8Mhz?
Also do I need to change any fuses?
Thanks
I think you're a bit out of luck.
The ATmega doesn't have hardware USB, so I assume the bootloader is using V-USB to implement USB. That stack, being a software implementation of USB's high-speed signalling, requires at least a 12 MHz clock (higher is better).
I don't think you can run V-USB using only the internal 8 MHz oscillator.
According to the OP comments the micro is indeed an Atmega32u4, not an Atmega32 (#OP: please fix the question to match this).
Since it has onboard USB, you can use a pre-existing bootloader like the sparkfun one:
https://www.sparkfun.com/products/12587
Here you have the link to one of their products, the Arduino pro micro 3.3V (which runs at 8MHz). You can add the sparkfun arduino boards repository to your IDE and then just use the board specification for their pro micro 3.3V do upload the correct bootloader and to program it through the USB just like the usual Arduino Micro.
I am new in this. Bought Atmega8a mcu to have some fun with it. But I am unable to program it using arduino uno rev-3. Haven't used any external parts to program it. Just connected the chip as below:
Arduino pin 10 to chip pin rst,
Pin 11 to MOSI,
Pin 12 to MISO,
Pin 13 to SCK,
Connected vcc and gnd to chip pin 7 & 8,
Also used an 10 uf cap, arduino rst to gnd.
Trying to upload the bootloader using arduino ide 1.6.9. It says:
avrdude: Yikes! Invalid device signature.
Double check connections and try again, or use -F to override this check
Am I missing something?
Most minimal AVR setups include a 10k pull-up resistor on the reset pin. Are you sure you don't need one?
Arduino target cpu (or variant) must be ATMega8A.
"Invalid signature" is not so verbose - it says nothing. Enable verbose log for avrdude in Arduino setting.
If signature is slightly different from actual one, it's selected variant problem.
If it's something like 0xFF or 0x00 it's usualy wiring, reset or missing xtal problem.
Bootloader needs correct xtal/resonator (AVR runs from internal 8MHz clock and it's divided by factor 8 by default, but after flashing bootloader it'll be set to crystal oscilator - depends on target/variant)
Remove cap from RST, it might be slowing down reset and cause invalid reading
Currently there's no arduino board with atmega8a as the main microcontroller.
You forgot about pins 20 and 22 -- you must connect them to VCC and GND even if you're not going to use ADC.
EDIT:
Ad. 1. It would be possible to add support for atmega8a to arduino ide, by modifying hardware/arduino/avr/boards.txt file and compiling a bootloader for atmega8a.
I bought my Arduino Uno R3 a few months ago. It's been working like a charm since then, but today, it stopped interfacing with my computer. Let me be more specific. I have a 2013 Macbook Pro Retina with OS X 10.9 (Mavericks). It has the latest Arduino IDE installed.
I was using it today and after uploading a simple sketch (it worked for a little while) my Mac stopped recognizing it, and since, I haven't been able to access it. The LED connected to Pin 13 stays on 100% of the time. The RX/TX LEDs don't flash, but the main functions of my sketch (other than the serial functions).
Have I screwed my Arduino's Serial chip? What can I do? I am only 15, so another $30 is a little bit too much to spend to get another one.... :)
Thanks!!
UPDATE: I forgot to mention that I have tried my other Windows computer, and another cable, just to rule out those possibilities.
That is a very common issue with Arduino. I used to face that problem all the time while using Arduino. Though I never really found a solution for this, the problem did go away after sometime. Did you try resetting the uC using the reset button on the board, or restarting the IDE or your system if neither worked?
Make sure you have chosen the right COM port. On a windows system you can do this by going to device manager and look for the ports tab under it.