A stable single transistor sine wave generator, that works with many values of input voltage. In PartSim you can easily change the value of the resistors and capacitors and observe the effect on the frequency of the oscillator. If you are manually calculating the frequencies, make things simpler by keeping the values of the resistors and capacitors equal (R5=R6=R7 and C1=C2=C3). You can see in the simulation that it takes a while to begin oscillating, and in ideal conditions it would need a signal to start oscillating, however in practice, noise begins the process without it.
2N2222 Phase Shift Oscillator - [Link]
by drmpf @ instructables.com:
The first instructable shows you how to use the free pfodDesigner available on GooglePlay to design Android menus to switch Ardunio outputs on and off from your Android mobile, without you having to write any program code at all. The Fish Tank picture above shows the example designed in this instructable.
The example project shown here is suitable for complete beginners. This instructable does not require any soldering and No coding experience is required.
Once you have finished this instructable you will be able to design whatever menus you need to switch Arduino outputs on and off. When you have completed the second instructable (to be posted later) you will be able to switch real things on and off from your Android mobile, via relays connected to Arduino’s digital outputs.
Code generator for custom Android/Arduino menus - [Link]
by BrittLiv @ instructables.com:
Heating things up is one of the most performed tasks in a lab. Quite a lot of times it is not enough to simply hold something at a certain temperature, but the rate at which something is heated and for how long is just as important. Especially when you try to develop catalysts for chemical processes, the temperature program and exact temperature control is crucial and you probably do not want to stay in the lab for 16 hours to manually adapt your temperature program. Unfortunately, programmable temperature controllers that can automate processes are really expensive. So I decided to build a highly customizable controller that is able to run temperature ramps and read multiple different temperature programs from a SD card. It also provides a logging function on the SD card that allows you to evaluate the resulting temperature profile after running a program.
Programmable Temperature Controller + Hot Plate - [Link]
Ondřej Karas of DoItWireless writes:
We described simple method, how to drive modellers servo. Today, we are going to try to drive this servo from potentiometer connected to TR module ADC. It is reaction to forum thread where is discussion about airplane model control possibility.
Wireless servo controller II - [Link]
Freeing the Lepton from its Iphone prison!
The smallest thermal imager - [Link]
Brett’s new masterclock is Arduino-controlled and keeps very accurate time by periodically synchronizing with the DCF77 “Atomic” Clock in Mainflingen near Frankfurt, Germany. The DCF77 library for Arduino is used to decode the time signal broadcasted from the atomic clock. The time is displayed as hours, minutes, and seconds on six 1″ seven segment LEDs. A 4×20 I2C LCD display is also used in the project to display additional info such as display brightness, sync information, signal quality, auto tune’d frequency, auto tuned quartz accuracy, etc. Both the displays are auto-dimmed based on the surrounding light intensity using an LDR sensor and pulse width modulation technique. His clock also includes a bluetooth link for updating the Arduino firmware from a PC without an USB cable.
Very accurate master clock synchronized to the DCF77 time signal - [Link]
Rupert Hirst writes:
My through hole, home etch friendly version of the surface mount FabISP, which is based around the USBtinyISP AVR ISP Programmer. The new USBtinyISP drivers also support for Windows 8
This design uses the ATtiny84 microcontroller instead of the larger ATtiny2313 of the USBtiny.
ATtiny84 USBtiny AVR ISP programmer - [Link]
The circuit is built around a popular Sanyos stereo head preamp IC LA3161. Low electrical signals from the playback heads are fed to pins 1 and 8 of IC1 via DC decoupling capacitors, respectively. Components between pins 2 and 3 and pins 6 and 7 provide adequate equalization to the signals for a normal tape playback.
Tape Head Pre-Amplifier - [Link]
Who says logic analyzers canʼt be beautiful? Saleaeʼs Logic USB Logic Analyzer packs a lot of punch in a small, anodized aluminum package.
- Monitors up to 8 channels
- Saves up to 10 billion samples
- Is multi-platform Windows, Mac or Linux
- Can export data in binary, VCD and CSV
- Supports I2C, Async Serial, SPI, 1-Wire, CAN, I2S, PCM, and UNI/O
Used by students, engineers and hobbyists, Saleaeʼs analyzers have been used for satellites, avionics, submarines, electric cars, and more.
And with the launch of the Saleae Logic 4, 8, Pro 8 and Pro 16 next month, recording, measuring, and annotating will be even easier.
Saleae Launches New Logic 4, 8, Pro 8, and Pro 16 Analyzers - [Link]
by Kathy Yang @ elecfreaks.com:
We could often feel frustrated when programming using the Arduino IDE. Why? Not because of how many errors we encounter in the program, but it is so difficult to find out the errors in source code, which is really something freaking out. For example Arduino IDE does not seem to display the number of rows, the prompt window can show us in which line the error occurs, but we just have no ideas where the line it is. If you can double click to find exact position of that line, then we will not care about which line it is: line 1 or line 10. But that just hasn’t happened. What’s worse, it cannot change the display font, which reads clumsy or neither too small or unclear enough, as a consequence, seriously affecting the efficiency of our programming. So I wanted to transfer to another editor and the new editor had better be able to take the place of the Arduino IDE completely. Then I found the Sublime Text 2. Here take a look at the overall interface of it.
Use Sublime Text 2 to Replace Arduino IDE - [Link]