9
votes
How do I repurpose Arduino's reset button
If you just want the reset button to change the program mode, the
simplest thing would be to let the button reset the Arduino and switch
modes each time your program restarts. Then you do not need to ...
- 42.2k
7
votes
Accepted
Two function Reset button - long/short press
It can be done with one button, one resistor, one capacitor and one GPIO pin (in addition to the RESET pin):
simulate this circuit – Schematic created using CircuitLab
Pressing the button ...
- 105k
6
votes
Accepted
Disable Reset when Com Port Connected/Disconnected
If you review the Uno schematic, you can see the circuitry that enables an automatic reset when serial communication starts. The circuitry is intended to allow easy program downloading.
There are ...
- 8,830
5
votes
Accepted
Is there any way I can stop the Arduino Mega 2560 from resetting all variables after losing and reconnecting power?
Save the variables you need to EEPROM.
- 11.3k
5
votes
Accepted
Why is there a limitation in using Serial.println on ESP8266?
It's happening because you're not giving the ESP8266 a chance to do its housekeeping activities and the watchdog (which is enabled by default) is timing out - as evidenced by the very first line of ...
- 105k
5
votes
Accepted
ESP8266 - Sending a software Reset Command
1/0 is an exception (divide by zero). esp8266 arduino core has soft reset: ESP.reset(). Calling this function you get a valid reset.
Note to software reset. esp8266 has a bug. If software reset (or ...
- 17.7k
4
votes
Reset an Arduino Uno in code
In case you have the original Arduino bootloader which you want to execute as a part of the reset, you can do a SW reset by jumping to the bootloader reset address (0x7800 on ATmega328p boards)
void ...
- 1,278
4
votes
Accepted
Auto Reset during programming Arduino
A Reset is necessary to activate the Bootloader and allow programming. Without the DTR signal the Reset button has to be pressed just before starting the upload from the Arduino IDE.
- 7,959
4
votes
Why does the Leonardo take 8 seconds to restart?
That's the firmware waiting for a programming connection. If you want alternate behavior them burn SparkFun's ATmega32U4 firmware to it. One press of Reset will reset the device, and two presses will ...
- 17.6k
4
votes
Reset Arduino Uno R3
Every time you rewrite an Arduino, the previous code is completely wiped out (except for the bootloader, which doesn't change).
You will not fill up your arduino -- it is not like a filesystem where ...
- 6,974
4
votes
Arduino Resetting in Automotive Application
There is no power spike or loss to the PCB. The car is not actually
running, I am just turning the key on and off.
And did you verify that with a digital scope? I doubt it.
I don't think you ...
- 993
4
votes
Store value in EEPROM to perform different actions on reset?
While it looks interesting as idea, IHMO you have keep in mind:
Include some code for button denouncing logic. Actually you will receive couple of “resets” during ~20ms during button press. Without ...
- 151
4
votes
Accepted
Standalone ATmega328P stops responding when RX is connected
There are two things wrong with the circuit in that demo.
There is no decoupling capacitor on the power pins. This is required to keep the power stable during opertaion.
More critically: this is ...
- 105k
4
votes
Accepted
Accessing funcition in object via `->` is crashing (resetting) Arduino
Derived derivedObj; is a local variable. It's deleted when the function exits. You have saved a pointer to it, but with that object now gone your pointer points to nothing of any interest - so doing ...
- 105k
4
votes
Accepted
Is there a way to make the RESET pin work in the inverse?
My personal preference would be to attach a NOT gate to the RESET pin. This can be constructed very simply from a single NPN transistor (or N-channel MOSFET) and a resistor.
simulate this circuit &...
- 105k
4
votes
Accepted
How do I escape a boot loop?
Start holding the reset button. This is to prevent the Arduino from entering the boot loop.
Unplug the Arduino and plug it back in.
Open a new sketch. Remove all of the code and replace it with int ...
- 307
3
votes
Accepted
How do I sense that the serial monitor is started?
You can't. There is no way of detecting if the serial monitor is open or not.
However, you can disable the automatic reset and provide some functionality in your code for saving data to EEPROM when ...
- 105k
3
votes
WDT & Software RESET in ESP8266 + Arduino IDE
Software reset in ESP8266 is achieved using ESP.reset()
as per WDT, the other answer has info on that, i.e. software WDT is cleared using yield() - hardware WDT is not accessible through software
- 656
3
votes
Accepted
Reset Arduino Uno R3 from Serial when it freezes (stops looping)?
You can reset the Uno over the serial link by toggling the DTR line. How you do that depends on what platform and language you are using. There is a capacitor between the line and the reset pin, so ...
- 1,553
3
votes
Pressing reset button restarts program only seconds latter
The first thing that happens when you apply power to a board or press reset, is the bootloader executes. That waits for a short time to accept a new sketch over the serial port. If nothing arrives it ...
- 105k
3
votes
Accepted
Arduino(s) not resetting on Serial connection lost / re-established - why?
What you have done is to disable the "HUPCL" signal that is sent when the port is opened/closed.
You can turn the signal back on with:
$ stty -F /dev/ttyACM3 hupcl
And you can turn it off again ...
- 105k
3
votes
Arduino Pro Micro bricked?
Problem solved! By taping twice the reset and holding it the second time I managed to program my board and now the arduino ide detectes it and it works as expected.
Taping and releasing the button ...
- 153
3
votes
nodemcu GPIO6 clock
No. There is no way you can use it (or not without a lot of messing around...).
According to the ESP8266 GPIO Reference Guide:
GPIO6 to GPIO11 are usually connected to the flash chip in ESP8266 ...
- 105k
3
votes
Accepted
Arduino Nano randomly resetting
Thank you all for your contributions. I managed to find the issue and solve the intermittent reset. I was expecting to find a hardware problem as the root cause, but just in case it was software ...
- 61
3
votes
Accepted
How to difference hardware reset and software reset?
You can't. There is no "software" reset. When you upload new code a hardware reset is triggered by the DTR pin of the USB interface chip.
Instead I would suggest maintaining a "data ...
- 105k
2
votes
Watchdog approach
As a watchdog mechanism to protect against software lockup type issues then using one processor to detect issues and reset the other is an economical idea. However, I would completely agree with Nick ...
- 136
2
votes
Accepted
Watchdog approach
I had a similar project a while back, including the desire for the watchdog.
My hypothesis is that the likelihood of both going down simultaneously is relatively low ...
Here's the problem. If it ...
- 37.9k
2
votes
Watchdog timer stuck in restart loop? (green led flashing)
Enabling watchdog timer system restart and waiting in a loop until reset is a legitimate way of SW resetting the µC as is using watchdog for catching µC's misbehavior which can be caused by various ...
- 510
2
votes
Accepted
How do I reset an ESP8266 with an FTDI and no reset button?
Pull the reset pin up by connecting it to 3.3v with a 10k ohm resistor, then to reset the ESP you temporarily ground the pin, bringing it down to 0v/GND.
I'd recommend putting in a button for that :)
- 306
2
votes
Accepted
Float to integer conversion for control program crashes arduino
I actually solved this issue and noticed a few things for those interested: the printNumI() function was making the arduino crash as it was badly initiated with an extra argument. Once I solved this ...
- 131
Only top scored, non community-wiki answers of a minimum length are eligible