Here is my home-built, cloth iron soldered, range extender for CC1101 (included onboard) RF transceiver chip from Texas Instruments. You could say that it is a CC1101+CC2591, but for 868/920MHz band. I used MAX2233 RF amplifier from Maxim-IC. It can deliver up to +24dBm (250mW) of RF amplification with +10dBm of input.
250 mW RF modem – [Link]
Based on the idea from http://www.josepino.com/pic_projects/?timebase I have created a 1Hz Clock Generator. I use PIC12F675 as it’s available locally. Its price is just about US$1.
The concept is using 32.768kHz crystal as a clock for the PIC. Therefor, the internal instruction clock is 32768/4 = 8192 Hz. By using the 16 bit Timer1 to count the instruction clock cycles, the interrupt will occur every 8 second. This period can be reduced by setting initial value of the Timer1 (TMR1H:TMR1L).
1Hz Clock Generator using PIC12F675 - [Link]
Pinguino is an Arduino-like board based on a PIC Microcontroller. The goal of this project is to build an integrated IDE easy to use on LINUX, WINDOWS and MAC OS X. Arduino is a powerful tool with some defaults. One of its inconveniences are a no native USB interface on the chip and its code length.
The IDE of Pinguino is built with Python. An integrated preprocessor translates specific Arduino instructions directly into C. This preprocessor reduces the code length and the execution speed. Pinguino hardware is based on a 18F2550. This chip has an integrated native USB module and an UART for serial link.
Pinguino – [Link]
This project is a 2 channels amp meter. Those channels are completely isolated up to 2000 volts.It provides auto detection for AC or DC current. The main part of this project is the current sensor ZMC10 a cool DIP 14, which supports up to 10 A. The current is measured inside by hall effect sensor and display data using a graphic LCD of the read current and max peek value, DC or AC
Digital 2 channel 10 Amp Meter - [Link]
The purpose of this project was to design and implement a reliable and cost effective wireless temperature sensing system for the recreational spa industry. This wireless product has potential applications in many other areas including, salmonid enhancement hatcheries, private/public tubs, and indoor/outdoor pools. [via]
Wireless Spa Temperature Sensing System - [Link]
Care to hand control of your playlist over you to an Arduino? [via]
Awhile back I was working on a project that that I wanted to be able to start music the on my mac through the IR receiver. After a while of looking around I found this library which allows you to use your arduino as an Apple Remote. I integrated it in to my project and it worked great! So the other day I decided to make an Apple Remote shield for my arduino.
DIY Apple Remote shield for Arduino - [Link]
Atmel’s ATA874x single-chip UHF ASK/FSK RF transmitter family targets a broad range of proprietary wireless industrial and consumer applications such as metering, alarm systems and home control applications. This new AVR® product family offers RF performance operating in the license-free ISM frequency bands (868 to 928 MHz, 433 MHz, and 315 MHz).
AVR mcu with integrated RF transmitter functionality - [Link]
Fast and reliable identification of liquids is of great importance in security, biology and beverage industry. An unambiguous identification of liquids could be made by electromagnetic measurements of their dielectric functions in the frequency range of their main dispersions, but this frequency range, from a few GHz to a few THz, were not covered by any conventional spectroscopy. Researchers at the Institute of Solid State Research in Jülich, Germany have developed a technology that holds promise for reliably detecting potentially explosive substances and differentiating them from harmless liquids.
Superconducting sensor identifies liquids - [Link]
Control the colour of a powerful LED light beam with a remote control, store the colours and recall them at will. [via]
With this thing I can control the colour of a bright light into many different colours using the three fundamentals colours : red green and blue. Adding them toghether with different intensity can yeld very great a range of colours from the visible spectrum.
A remote controlled power RGB LED mood light - [Link]
Fred points out this schematic for a rather interesting radiotelephone transmitter instantaneously powered by the operator’s voice. [via]
One of the neatest minimalist amateur radio transmitter circuits around – this one is voice powered – it provides DSB, (double side band)modulation and power from an ordinary 8-ohm speaker – if are in doubt that the circuit works, the maker has the contacts and the voice recordings to prove it!
Voice-powered RF transmitter - [Link]