Duckett George. - Arduino Stack Exchange: Questions and Answers
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Topics covered include: Arduino Uno, Programming, Serial, C++, Sensors, Pins, Uploading, Library, Timers, Power, ATMega328, Compile, Shields, Arduino Mega and many more
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I'm making a simple Arduino web server and I want to keep it turned on all the time. So it must endure to stay working continuously.
I'm using an Arduino Uno with a Ethernet Shield. It's powered with a simple outlet power supply 5V @ 1A.
My Questions:
- Will I have any problems leaving the Arduino turned on all the time?
- Is there some other Arduino board better recommended for this?
- Are there any precautions that I need to heed regarding this?
You shouldn't have any issues keeping it on all the time, however, some thing to consider is any counters you may have, like the use of millis().
From the Arduino docs on millis:
This number will overflow (go back to zero), after approximately 50 days.
So for projects that are on for long periods of time, you may not see an issue immediately but something like this could pop up and cause errors down the road.
A couple of things to keep in mind (outside of @Sachleen's mention of Milli's):
Like any electronics, heat can be disruptive. The micro-controller itself isn't likely going to be a huge issue from the perspective of heat, but other components like the power supply might cause issues.
If your code uses EEPROMWrite, be aware that the EEPROM is only rated for something in the neighbourhood of 100,000 writes.
Keep in mind that the flash and EEPROM have limited lifetimes (about 10,000 read/write cycles) so if you're doing a lot of reading and writing to those, they may become corrupted. In a test I did, an external EEPROM took about 3 days to start becoming corrupted.
I have been able to connect MATLAB to my Uno with this line of code: a = arduino('COM4'); through this package: Matlab support package for Arduino.
Right now, MATLAB is my main script that will synchronize all the components [like the Arduino].
I am able to send pulses to my stepper-motor just by using:
void loop() { digitalWrite(2, HIGH); delay(1); digitalWrite(2, LOW); delay(1);}This works fine, and will make the motor move about once every 2 milliseconds. My problem is that I cannot find a way to produce this same delay through MATLAB's interface. I do know that MATLAB has a pause() function, but when I set up a loop in MATLAB like this:
a = arduino('COM4');for m = 1:400 a.digitalWrite(2, 1); pause(0.001); a.digitalWrite(2, 0); pause(0.001);endEach step takes WAY longer - about 200 milliseconds each.
What are other options for creating the pause between digital High / Low being sent to the Arduino? It would be nice if I could control the outcome from Matlab, through Arduino.
The increased in observed delay is due to the time it takes to send the command from MATLAB to the Arduino have its code execute the requested command. In your case the a.digitalWrite. So actual time between pulses using MATLAB's delay is 0.001 pause plus the time of baud rate times the packet size and decoding then execution.
I would recommend not pursuing this solution of the MATLAB controlling the timing of Step Motors, remotely. As this latent coupling will be a frustrating limitation. Noting that for step motors the timing can not afford such latent execution. Hence all the 3D printers and many CNC with Step Motors use Arduino's which get G-Code (motor move commands with destinations) and the Real-time firmware handles the stepping, within tolerances.
I would suggest using something like grbl firmware with step motor shield and then have the MATLAB send the needed G-code. Where there are others with much more features but tailored to 3d Printing. grbl is simpler and straight to the point of moving motors.
I have a uno that I have been using for 3 years now. I will be using it again in a rather critical project in which failure on the part of the board could be rather expensive and dangerous. So, I would like to be sure that the board is not approaching end of life or going to fail anytime soon. Is there any reliable way to figure out how long the board will function without failing or reduction in performance?
Unfortunately, there isn't much way to really determine "wear" in the context of solid-state electronics.
Probably the things that are most likely to fail are the electrolytic capacitors and the connectors.
First, if you're using an ATmega CPU for something that could possibly injure someone CONTACT ATMEL AND TALK ABOUT SAFETY PRECAUTIONS. The ATmega CPU used in most of the arduino models is not rated for use in such situations.
In EVERY datasheet:
Atmel products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life.
Now, realistically, this is probably mostly lawyer repellent, but you should still take appropriate precautions.
Really, while there isn't anything on a common arduino board that really wears out except the connectors, why are you trying to save $30 at a potential huge cost? Just buy a new board.
I'd also strongly reccomend you chose a board with a SMT ATmega328P, since that removes the IC socket contacts from the list of concerns. If possible, also remove the pin-headers, and solder wires to the board directly. Try to minimize connectors, since they are frequent points of failure.
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