Kerry D. Wong writes:
I just got myself a couple of Arduino Due boards. While they were released almost two years ago, I have not really got a chance to look at these until quite recently. Arduino Due is based on Atmel’s ATSAM3x8E 32-bit ARM Cortext-M3 processor. The processor core runs at 84 MHz, which is significantly faster than its 8-bit AVR counterpart ATmega328p which runs at 16 MHz. For an ATmega328p, the highest achievable PWM frequency is 8Mhz (square wave), so we should be able to generate much higher frequency signals on an Arduino Due. But how high can we go? Let’s find out.
On Arduino due PWM frequency - [Link]
A fine-spot welder is one of the few equipment where building yourself is cheaper than buying. There are already published a lot of DIY spot welders, this one has some unique features:
It can be used in 2 welding applications: opposed and series configuration.
The construction is kept very simple.
Accurate electrode force adjustment.
It has a solid electrode holder, made of a radiator earthing clamp.
An Arduino microcontroller is used to set the weld time accurately.
Creates a double pulse which improves clamping.
The current can be reduced for welding sensitive parts.
DIY battery tab resistance fine-spot welder - [Link]
Electro18 posted a tutorial on how to make a portable digital optical tachometer using an Arduino Uno, an instructable here:
A tachometer is a device used to measure the RPM or Revolutions Per Minute of any rotating body. Tachometers can be contact based or non-contact ones. The non-contact or contact-less optical tachometers usually use laser or Infrared beam to monitor the rotation of any body. This is done by calculating time taken for one rotation.
It can measure RPM over 20k
Sensor range extends upto 7~8 cm
Displays Maximum RPM
Measure RPM – DIY portable digital tachometer - [Link]
Remote control your electrical devices through your local network or internet. The circuit contains one output (Relay) and one input (isolated input). The whole project was built by using arduino nano platform and an ENC28J60 ethernet module. It can be used the W5100 ethernet module instead of ENC28J60, by replacing the UIPEthernet library to Ethernet library.
Moreover, the control is made from the Android application I wrote and it’s available on Google Play (https://play.google.com/store/apps/details?id=com.serasidis.NetworkRelay).
The schematic diagram, arduino sketch, photos and demonstration video is on my web site:
Arduino Network relay - [Link]
Stephen Wylie , “Program two ATmegas w/an Arduino & AVRDUDE without re-cabling in between!”
Those of you who have programmed an Arduino through the Arduino or AVR Studio IDE may have noticed the utility that is really doing the work: AVRDUDE (AVR Downloader/UploaDEr). This is a powerful program that can facilitate programming new sketches on top of a bootloader, load a brand new bootloader or chip image, capture the current firmware programmed on the chip, and set fuse bits (which can render your chip unusable without special tools if you’re not careful).
Make your own dual programmer in AVRDUDE - [Link]
By Christian Granvillano @ open-electronics.org:
Today we’ll explain how to exploit the potential of Arduino as a programmable logic controller, connecting it to appropriate interfaces for I/O.
The PLC (Programmable Logic Controller) has been and still is the basic component of the industrial automation world. The Industrial application made the PLC systems being very expensive, both to buy and repair, and also because of the highly specific skills requested to software designers to extract the maximum potentials from controllers. Arduino is a kind of universal programmable controller, although it is only the “core” and in any case it has been built for general applications; with a little of external hardware (essentially interfaces capable of transferring signals from sensors and to actuators, reducing the EMI which may damage the microcontroller) and an appropriate software may, however, become something very similar to a PLC.
Arduino as a programmable logic controller (PLC) - [Link]
Javier from CookingHacks writes:
We made a step by step article about how to track vehicles using Arduino + GPRS / GPS. Then we integrated the information using the Google Maps API. All the code is available with open source license.
Realtime GPS+GPRS tracking of vehicles using Arduino - [Link]
by Jose Daniel Herrera:
Here I present another project based on a addressable LEDs strip, based on WS2812b leds.
It consists of an ‘electronic’ candle, which lets you select set colors, adjust the intensity, and have different effects like rainbow, fade and fire. The project arose from the purchase of an IKEA lantern model BORBY … the idea was to replace a candle of considerable size, for something more … modern.
Candle with remote control and Arduino Pro Mini - [Link]
Matt of SkyLabs has a nice build log about a temperature controlled reflow oven he built using an Arduino based PID controller and a standard toaster oven:
We have successfully managed to build a temperature controlled reflow oven using an Arduino based PID controller and a standard toaster oven from Robert Dyas! This is a must have accessory for any hobbyist who regularly uses surface mount components within their designs. Below we have a build log documenting the process of constructing the oven including:
Teardown of the original oven
Custom enclosure construction
So to start off I will outline a basic parts list of what I used:
Reflow Oven Shield
Solid State Relay
230v AC to 5v DC Power Supply
Custom Laser Cut Enclosure
Temperature controlled reflow oven build - [Link]
Charles Edward Pax has announced that the T400 temperature datalogger is now being offered on Kickstarter!
The Pax Instruments T400 datalogger is an open source four-channel thermocouple temperature datalogger based on the Arduino™ Leonardo platform. It is ready to use out of the box with the features you want most. Measurements can be logged to MicoSD card, printed to serial port, and graphed. The T400 is a great tool for anything from live thermal process monitoring in the lab to long-term environmental data collection in the field.
Data logger handles four thermocouples - [Link]