Using watchdog timer in your projects. All AVR microcontrollers have internal watchdog timer that can be successfully used in your projects. Atmega328 and other modern AVR microcontrollers have so called Enhanced Watchdog Timer (WDT). It has few very useful features including: separate 128kHz clock source, ability to reset microcontroller and generate interrupt. From hardware perspective watchdog timer is nothing more than simple counter that gives a pulse when it counts up.
This pulse can be used either to generate interrupt or simply reset MCU (or do both). Watchdog clock and prescaller Watchdog timer is clocked with separate 128kHz oscillator. Watchdog Interrupt mode Watchdog timer interrupt is a valuable source of interrupt as it depends on separate clock source. And there is a special case where watchdog can generate both: interrupt and system reset.
Programming AVR watchdog timer There are two ways to set up watchdog timer: by programming WDTON fuse when flashing MCU and another is during program flow. Related Read. Small But Mighty: Meet Adafruit Trinket. Note: This excerpt is adapted from author Mike Barela’s new Make: Book, Getting Started with Adafruit Trinket. The Arduino has revolutionized the use of microcontrollers—programmable electronics—in the last several years.
This can be attributed to easy to use hardware and software at a reasonable price point. The often-cited Internet of Things has grown from the ubiquity of easy to use programmable electronics, sensors, and communications. One of the few arguments that typically comes about after building a permanent project is “I put my Arduino Uno in the project, now I am ‘out’ my $30 Uno.” That, and many projects do not require all the horsepower and connectivity an Arduino Uno or larger board offers. Using Trinket Many projects do not require the size, power, and capabilities of larger Arduino compatibles. Wearables A very fast growing use for electronics.
Sensing The Internet of Things is composed of many small smart sensors communicating information on the world around us. Memory. How to detect low battery within AVR. If you power your electronic device from battery, you probably want to have feature that tells when battery is running low. For rechargeable batteries it is crucial to know when voltage is nearing to threshold when lower drop would damage battery itself.
Say LiPo batteries cannot be discharged lower than 3.0V. Josh have went through this problem by analyzing low battery indication options. He says that small circuit built around MCP65R46 can be good choice where voltage is simply compared to reference inside chip, but problem is that in that case you need additional components. So he thought that in microcontroller based circuits you can get away without using any circuit and still have same functionality if not better. Related Simple way to monitor AVR battery voltage It is important to monitor voltage level in battery powered devices.
January 19, 2011 In "AVR Projects" Lithium ion battery charger for robotics December 7, 2007 Attiny85 based dual lead acid battery charger.
Arduino based programmable load. Programmable electronic loads can be handy in many testing applications. It can be used to test power supplies, batteries or tuning other equipment. Practically speaking building controller based load isn’t that hard. All you need to do is to drive MOSFET at some point. This point can be maintained by reading voltage and current on the load. Jasper have built an Arduino controlled electronic load that can withstand 30V and 5A but max 15W.
Transistor Gate is with voltage that is set on MCP4725 I2C DAC. Read. Simply good Atmega64 development board. Before Arduino appeared, embedded hobbyists were more attracted to building their own development boards. If someone needed new feature they simply included in their design. We don’t say that Arduino like approach is bad, but it feels that sometimes it makes us lazy on hardware.
There is not much creativity by simply grabbing Arduino, dropping couple libraries out of pool and writing couple lines of compact code. Anyway, if you like to do more barebone developing, Radek suggests his Atmega64 development board which can serve as great prototyping board. It features many useful functionality like DS3231 RTC, DS1820 1-Wire temperature sensor, 24AA00SN I2C EEPROM, FT232RL for USB connectivity, 16×2 LCD, couple of seven segment LED displays, eight buttons and 16 LEDs.
Read. Write Arduino Software in C. The World Famous Index of Arduino & Freeduino Knowledge. AtTiny Arduinos. JeeLabs SMD Kit. 4 Operating Systems for the Arduino. I was working in the lab, late one night, when my eyes behold an eerie sight... Yes, Halloween is a long time ago, but that stupid song is still stuck in my head.
I miss Halloween. I never got to post up pictures of my skeleton running off IXM's. :-)Anyway, I was browsing the Arduino forums and saw this cool post about DuinOS, a real-time embedded "operating system" for the Arduino. DuinOS by RobotGroupIt's a simple little realtime OS (RTOS) built by the guys at RobotGroup (hello!)
, and can be downloaded here. It's meant to have a simple function scheduler, implementing a basic form of multitasking (not quite multithreading, but something like round-robin scheduling I think). Well, that's something of a stretch, but it's getting there... we won't get into context switching an RAM page swapping just yet :-) So then that got me thinking, why not write up the other "OS's" out there for the Arduino platform. Ok. And it's all zipped up over at the Open Source App Store here. CodeBender.CC Makes It Crazy Easy To Program Your Arduino Board From Your Browser. The official Arduino IDE is a dour piece of software designed for uploading code to the ubiquitous and super-cool micro controller.
It is a standalone, non-networked app that isn’t very pretty to look at. But what if you want to share code and upload programs right from your browser? That’s where CodeBender.cc comes in. CodeBender is a browser-based IDE that supports uploading to nearly any Arduino board. You can use the program to copy sample code, browse code uploaded by other users, and even store private snippets.
Because it is collaborative you can clone bits of code and use it in your own projects and there is even a curated list of cool snippets. “We’ve also developed a technology that allows our users to program and control a network-enabled Arduino (i.e. The system handles compilation and error reporting and ensures that the code you upload to your Arduino won’t break your project.
Digispark - The tiny, Arduino enabled, usb dev board! by Erik Kettenburg. Learning XMega clock sources. Any microcontroller needs some clocking mechanism. This is how it performs instructions, count time, generate signals. Normally controller comes with many clocking options as there may be different needs of clocking speed and accuracy. Sometimes you may want to squeeze maximum performance out of it, then you would probably select the highest clock speed.
In this case you would loose energy efficiency over performance. Sometimes you only need to send simple control commands and keep time. Then you would choose 32.768kHz clock source which helps to preserve energy and do the job. Shawon wrote pretty good guide about selecting and setting Xmega microcontroller clock source. Read. Log your Arduino data on Excel. Many times we have come across a situation where we want to log certain data from a microcontroller to Arduino both for processing and records purpose. The data can be anything from a local weather data to even a data used for neural based applications. Thing project allows you to the same. It features an Arduino Uno along with V-USB and a simple ready to use library which have been used in this application. Another good thing is apart from an Arduino Uno, the total cost of the project is under 1$ and this is what I like about it.
Another good thing about this project is, that it can be used to understand the power of V-USB with older Arduino and homemade board-duinos which would benefit from USB input to the PC for logging purposes. Read. Learning XMega clock sources. Arnaud Jean Baptiste - Cross-Compiles Pharo for Raspbian. If you are not familiar with the usual PharoVM building process do not worry. This page will explain all the requirement step by step. For the following when speak about root it is the root of your project. Here you will finds scripts doing everything for you just edit the config.sh file and after sh configBuilder.sh sh build.sh I now look into the qemu emulation to avoid using a connected raspberrypi. But here all the install process explained step by step. First of all you will need Cmake Git and subversion sshfs: how install it depend of your platform Install the differents toolchains We use 2 differents toolchains: the cross-compilation tool from raspberrypi, and asasm a assembly compiler from RiscOS to compile the FastBltBit code. raspberrypi tools Here is the link to the github repository git clone Create your build environment Do your changes .
Nanite85 – is it the smallest tiny arduino? It seems that battle for smallest Arduino position isn’t over. When it seems that there is no mo place to shrink, here comes another one to take the place. This time Nanite85. As name tells this one is based on Attiny85 microcontroller with USB bootloader. Due to space constraints microcontroller is powered directly from USB without voltage converter. Nanite85 is breadboard compatible and comes with all 8 pins brought out. There is a LED which shares same pin as reset button. Read. AttoDuino Arduino Compatible Board "On Steroids" Developers and makers that enjoy creating projects using the Arduino platform might be interested in a new Arduino development board called the AttoDuino. The AttoDuino as its creators say is an tiny Arduino development board “on steroids” offering built-in Bluetooth connectivity together with battery management and floating-point coprocessor in a tiny form factor.
The creators of the new AttoDuino Arduino compatible development board explain : “We love Arduino. But we wanted more power. So, we created the AttoDuino. It’s Arduino compatible, but with a lot more power. Basically, it’s like an Arduino on steroids. Battery charging and voltage regulation are also onboard, making it simple to use.Powerful – The AttoDuino features an fast ARM processor with a built-in floating point coprocessor. The AttoDuino project is currently over on the Kickstarter crowd funding website looking to raise enough pledges to make the jump from concept to production.
Source: Kickstarter. How Arduino And Raspberry Pi Can Enhance Your Connected Home. ReadWriteHome is an ongoing series exploring the implications of living in connected homes. The connected home, the ultimate ideal in technology-driven luxury, promises easy living by passing along our drudgery to computers. But it’s not perfect. Even if you’re willing to shell out for expensive devices for your house, are you willing to trust them? There’s always the concern that when a middleman is involved, you’re relinquishing at least some control of your own domain. See also: Hacking The Connected Home: When Your House Watches You In that case, why not roll your own connected home?
Arduino, a microcontroller board, and Raspberry Pi, a fully functional mini-computer, are both cheap solutions for harnessing the Internet of Things at home. These DIY sensors and components are cheaper and easier to use than ever. Here are some of the ways to implement connected home features on a DIY device like Arduino or Raspberry Pi. Arduino Projects Make an Arduino safety alarm. Raspberry Pi Projects.
Arduino board as ATtiny programmer. This tutorial shows you how to wire up an Arduino used as an ISP (programmer) to an ATtiny45 or ATtiny85. To find out how to write code for the microcontroller, see the the tutorial on programming an ATtiny using the Arduino 1.0.1 software (or the older version for Arduino 0022 ). Materials and Tools For this tutorial, you’ll need: Arduino Uno or Duemilanove (w/ an ATmega328, not an older board with an ATmega168) ATtiny45 or ATtiny85 (8-pin DIP package) a 10 uF capacitor (e.g. from Sparkfun or from Digi-Key ) a breadboard jumper wires For more information, see our list of materials and parts and our list of prototyping supplies . Download and Install the Arduino Software You’ll need the Arduino software (version 1.0.1 or 0022). Turning the Arduino board into a programmer We’re going to use the Arduino board to program the ATtiny.
Run the Arduino development environment. Connecting the Arduino board and the ATtiny We’ll connect the Arduino board to the ATtiny as shown in the following diagram. Arduino Tutorials. Use Sublime text 3 Editor As Arduino IDE (To edit & upload Arduino sketch into Arduinos) Teensy USB Development Board. The Teensy is a complete USB-based microcontroller development system, in a very small footprint, capable of implementing many types of projects. All programming is done via the USB port. No special programmer is needed, only a standard "Mini-B" USB cable and a PC or Macintosh with a USB port. Update: Discussion / Support Forum Teensy 3.1 changes from Teensy 3.0 Teensy Loader Application Software Development Tools WinAVR C compiler.
Teensyduino, add-on for Arduino IDE. Simplified USB Examples or Dean Camera's LUFA library. Breadboard Usage The Teensy is available with header pins, for direct no-soldering-required use on a breadboard, which can also be run from the +5 volt from the USB cable. The 128x64 Graphics LCD can be used with Teensy 2.0 and Teensy++ 2.0 and Teensyduino using this GLCD library. Femtoduino.com - Femtoduino.