Matt from Antipasto Hardware introduces a 100% open source hardware and software Graphing Calculator based on Beagleboard embedded Linux hardware. This module is able to run R programming language. The motivation behind this project is to build a graphic calculator that is different from existing calculators, can run Linux and R code, can be programmed in C and Perl, has a Wifi connection and run on a web browser. Check project details on the link below. [via]
Open Source HW/SW Graphing Calculator - [Link]
In this two series tutorial learn about the tools and basic steps needed to start programming Atmel AVR microcontrollers in C programming language. It is written to people who are new to programming this type of microcontrollers. The AVRJazz Mega168 board will be used, however this information can be used for other AVR family.
In this tutorial learn how to use Maxim DS1307 Real Time Clock with an ATMega168 AVR microcontroller to build your own multi featured LCD clock.
Using Maxim DS1307 Real Time Clock with Atmel AVR - [Link]
This project shows how to build a mood vase using a battery powered unit. The unit shines different colors using three leds and a PIC12F683 microcontroller. It’s easy to follow the instructions below to build the unit as schematic and source code are included.
Mood vase – [Link]
This project shows how to modify an IKEA Lampan lamp to display RGB colors. It uses RGB LEDs and Atmel ATTiny1313 AVR. With the push of a button you can choose the desired color. You can find design files, schematic, PCB and firmware on the link below.
IKEA Lampan RGB LED Light – [Link]
This project shows how to build a LED temperature monitor. It is able to change color depending on room temperature. It is using an RGB led to display colors, an analog temperature sensor and a frosted glass sphere. The result is a high visible room temperature indicator. [via]
Nursery Room Temperature Monitor - [Link]
This circuit shows a typical over/under-voltage fault monitor for a single supply. It’s based on ICL7665 and produces a POWER OK signal when power is within limits.
Single-supply fault monitor - [Link]
There are two ways to learn PCB Trace Antenna Design. One is to go to the university the other is reading the article below! This article will guide you through “trial and error” approach to antenna design at the 2,4GHz communication band (wifi, zigbee, etc). The design procedure is clear enough and will help you save big time on your design.
The Dropout’s Guide to PCB Trace Antenna Design - [Link]
This project shows how to wire a circuit able to power a device using a photovoltaic and recharge the backup battery from excess power of solar panel. Find out how the panel and battery is connected on the link below.
Solar Power Circuit with Rechargeable Battery – [Link]