12 votes
Accepted

delay(time); vs if(millis()-previous>time); and drift

There's one important thing that you need to remember when working with time on an Arudino of any form: Every operation takes time. Your foo() function will take an amount of time. What that time is,...
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11 votes

Newbie Using Brown Out detector on Arduino Due for saving variables to eeprom?

Not a good idea - if the power goes down when you writing to EEPROM, your EEPROM data will be corrupted. The brown-out detector goal is to shut off the MCU, before it goes mad due to low power voltage....
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  • 528
9 votes

Sizeof variables and Due's RAM

sizeof doesn't return the number of elements. It returns the number of bytes. Since they are uint16_t arrays each element is 2 bytes - hence twice the size. The reason your last number is only 40928 ...
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8 votes
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Why does the Arduino Due have a native and USB programming port?

Either port can be used for programming, but the native USB port lets you do other things: It also enables the Due to emulate a USB mouse or keyboard to an attached computer. To use these ...
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  • 7,283
7 votes

Breadboard-to-Arduino wiring with flat flex cable assemblies?

Search for male-male jumper wire. Some of what you'll find is individual wires but there are also many that are connected together and you can rip off the width you need. Here's one from Adafruit but ...
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  • 7,283
7 votes
Accepted

SAM3X8E (Arduino Due) Pin IO registers

If you have a read of section 31 of the Datasheet, available from here, things may come a little clearer for you. Here's a summary of what I know: PIO stands for Parallel Input/Output and offers the ...
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7 votes
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Read OUTPUT pin value in Arduino Due

That method only works on AVR based systems. It exploits a "feature" whereby the IO pin, when in OUTPUT mode, is also in INPUT mode at the same time, and reading the pin reads the value that the pin ...
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7 votes
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Faster Arduino Mega

You should begin working with 3.3V. 5V is getting rarer and rarer as far as "real world" applications go. Many devices that you have been using at 5V will also work at 3.3V (such as the MAX22500E). ...
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6 votes
Accepted

Memory allocation on Arduino Due never returns NULL

Why This is a partial answer, for now, mostly with regard to: Why does malloc() never return NULL? So, the Due appears to use Newlib as its libc implementation; that is the systems C (standard and ...
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5 votes
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Why does command line BOSSA not recognize Arduino Due?

from the IDE's menu you can activate the verbose upload (and compile) mode, that will print all the command executed; Probabibly what you miss is the necessity to open the serial at 1200baud, that ...
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  • 751
5 votes

Arduino Time Clock Accuracy

Re-visiting an old question... as I found a very informative blog post that sheds new light into it. But let me first provide some context before giving the link. When assessing the quality of a time ...
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5 votes

Breadboard-to-Arduino wiring with flat flex cable assemblies?

Again similar to Sachleen's answer. You can crimp your own connectors onto a ribbon cable, that way you can have the desired header size. I've just done this manually with some pliers (I couldn't ...
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5 votes
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MCU Type ATmega16U2 not avaliable in Eclipse AVR Plugin

The ATmega16U2 on those boards isn't intended to be programmable by the end-user. It's only there to help convert from USB to TTL serial, which lets your computer communicate with the board's main ...
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5 votes

High Frequency Sine Wave Generation

To generate a square wave, you only need to update the output at a rate of two points per cycle. (Technically, when the Arduino's PWM output is configured for 50% duty cycle, that's a square wave at ...
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  • 450
5 votes
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Simple LED circuit is not working

What connects the resistor to the LED? Absolutely nothing. It's hard to work out which holes the LED is plugged into, but I think your current circuit looks something like this: You need to connect ...
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5 votes

Arduino is not responding to a Tiny RTC I2C modules, How to fix?

You have a couple of problems (although the lack of pull-up resistors is not one of them, because the board you linked has pull-up resistors on it). The DS1307 needs to operate at a minimum of 4.5 ...
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5 votes
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How do I read from /dev/ttyACM0 in Linux without a terminal emulator?

I have had very similar problems with my yun(shields) and I found the stty command to be very crucial for a good working. I use following command and it works with mega and due on the yun stty -F ${...
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  • 1,352
5 votes
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Arduino Due vs Mega 2560

The 'R3' version boards and shields are compatible with 3.3V and 5V. For example the Ethernet Shield V1 version 'R3' can be used with the Due. The new Arduino Ethernet Shield 2 is also compatible with ...
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  • 3,077
5 votes

Only getting error from ESP8266 AT commands

The AT firmware responded with ERROR because it received data, but timed out waiting for the CR/LF line ending. AT commands must be terminated with Carriage Return '\r' and Line Feed '\n' control ...
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5 votes
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How to enable exception handling on the Arduino Due?

First, we must make sure the "-fno-exceptions" compiler flag is overwritten with "-fexceptions". In addition, we must link a separate library that includes the compiler support ...
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  • 1,059
4 votes
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Connecting battery and LED to Arduino Due

What you want is something like this (ignore the fact that my mini breadboard is stuck to a shield): My starter Arduino kit came with the connector for the 9 volt battery into the power socket on the ...
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4 votes

Can't drive long NeoPixel strips with Due or Duemilanove?

Your Duemilanove only has 1k of RAM. That's not much. Each pixel takes 3 bytes of RAM (R/G/B). So (say) 60 pixels would be 180 bytes. That's less than 1k, but there would be other uses of RAM in your ...
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4 votes
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Can I Implement a PLL on an Arduino?

A PLL is a very complex device which is not something that can easily be created purely in code. Many microcontrollers include a PLL as part of their oscillator systemm which allows them to run ...
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4 votes

Arduino due slow clock

The slow clockr is primarily used for the real time clock (RTC) module inside the SAM3X chip. It can also be routed to other places when you want a low speed clock source, but the only places it is ...
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4 votes
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Arduino Due: Interrupt-based ADC hangs processing

In your interrupt handler, ADC_Handler(), you set sample_buffer_full when the buffer is full. I don't see anywhere in the code where sample_buffer_full ever gets reset (cleared) once it's been set. ...
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4 votes
Accepted

Simultaneously reading data from multiple serial ports

My question here is how can I simultaneously read out all the data from the different serial ports on the arduino mega sketch. As you are using several serial ports data can already be received ...
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4 votes

Arduino onboard LED pin number as a constant

Try LED_BUILTIN: pins_arduino.h:static const uint8_t LED_BUILTIN = 13;
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4 votes
Accepted

Arduino onboard LED pin number as a constant

#define LED_BUILTIN 13 (source)
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4 votes
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Programming Arduino in Pascal?

Not Pascal, but Ada, which is much less restrictive than Pascal while enjoying the same advantages over low-level programming, and much more actively supported with language revisions as recently as ...
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4 votes

Arduino Due vs Mega 2560

The Due can do a lot of things much faster. It has more memory and far more processing power. It has more flexible and more powerful built-in peripherals. It can't easily interface with 5V devices ...
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