RaysHobby build a project called RFToy:
it’s an Arduino-compatible microcontroller board for interfacing with radio frequency (RF) modules, such as the popular 433/315MHz transmitter/receiver, and the nRF24L01 transceiver. The RFToy has a built-in ATmega328, USB-serial converter (CH340G), 128×64 OLED display, three buttons, and a coin battery holder. Programming is done in Arduino through the on-board mini-USB port. It has three sets of pin headers to directly fit RF modules, and an audio jack to output RF receiver signals to a computer’s sound card. Using RFToy you can build a variety of projects involving RF modules, such as remote control and wireless sensors.
Introducing RFToy, an Arduino-compatible gadget for radio frequency modules - [Link]
My 68K breadboard computer is alive! It’s always a thrill when a pile of random chips does something recognizably computer-ish for the first time. Blinking some LEDs in sequence is great; running BASIC is super extra great. I’m excited.
This simple breadboard machine is a prototype of the 68000 single board computer I plan to build next. By testing the key design ideas in a breadboard prototype, I hope to uncover any lurking design problems while they’re still easy to find and fix. Once the design is committed to a PCB with lots of tiny surface-mount components, it will be much more difficult to make changes. Even probing specific signals to observe what’s happening may be difficult. The breadboard is a much more forgiving place to experiment and learn.
Breadboarding the 68K - [Link]
This is an Arduino monitor – tester by ctopconsult.com:
One LED for every single input or output
Can be used with Uno, Leonardo, Mega, Due, Mini, etc.
Also fits with my universal I/O board
Power taken from Arduino 5V and 3.3V outputs, and the Vin
Load on any pin is 10 kohm or more
LED intensity proportionally reflects the pin voltage or duty cycle
Arduino Monitor/Tester - [Link]
Among the signals below 550 kHz are maritime mobile, distress, radio beacons, aircraft weather, European Longwave-AM broadcast, and point-to-point communications. The low-frequency converter converts the 10 to 500 kHz LW range to a 1010 to 1550 kHz MW range, by adding 1000 kHz to all received signals. Radio calibration is unnecessary because signals are received at the AM-radio’s dial setting, plus 1 MHz; a 100-kHz signal is received at 1100 kHz, a 335-kHz signal at 1335 kHz, etc. The low-frequency signals are fed to U1, a doubly-balanced mixer.
Transistors Q2 and associated circuitry form a Hartley 1000-kHz local oscillator, which is coupled from Q2’s drain, through C8, to U1 pin 8. Signals in the 10 – 550 kHz range are converted to 1010 – 1550 kHz. The mixer heterodynes the incoming low-frequency signal and local-oscillator signal. Transistor Q3 reduces U1’s high-output impedance to about 100 Ω to match most receiver inputs. Capacitor C15 couples the 1010 – 1550 kHz frequencies from Q3’s emitter to output jack J3, while blocking any dc bias.
Inductor L6 couples the dc voltage that’s carried in the rf signal cable from the receiver/dc adaptor. The dc voltage and rf signals don’t interfere with one another; that saves running a separate power-supply wire, which simplifies installation at a remote location. Capacitors C14 and C13 provide dc supply filtering.
Low-Frequency Converter - [Link]
A state-of-the-art, mobile maker space, that brings the richness of hands-on making to you.
Tesla Truck (www.teslatruck.co) – is a mobile maker-space and a cutting edge prototyping facility equipped with 3D printers, Laser Cutters and CNC machines. Tesla Truckʼs mission is to enable students, teachers, makers, and other creative minds to collaborate, innovate, and create in a dynamic and accessible space. Tesla Truck brings the richness of hands-on making to your community by delivering a cutting edge fabrication facility on a mobile platform.
Tesla Truck: A Mobile-Maker Space for the Masses! - [Link]
by TheSignalPathBlog @ yoututbe.com:
In this world exclusive episode, Shahriar takes a close look at the all new Tektronix Real-Time USB Spectrum Analyzer. The RSA306 has an RF bandwidth from 9kHz to 6.2GHz with a real-time analysis window of 40MHz. While being entirely powered form a single USB 3.0 interface, it provides a 100% Probably of Intercept for any signal event of at least 100us in duration. The RSA306 is compact, lightweight and shock resistant. At the same time Tektronix has made its Signal-Vu PC software with 17 measurement capabilities free and significantly reduced the price of other Signal-Vu advanced applications!
The SFDR, linearity, noise floor and phase noise of the instrument are all measured and presented. The unit is then used to capture and analyze an intermittent RF interference, analyze and demodulate an RF FM signal using an antenna as well as demodulation a 256-QAM signal with -65Bm of total power.
Tektronix RSA306 USB Real-Time Spectrum Analyzer Review and Experiments - [Link]
Josh Levine writes:
It can be nice to know how much battery power you have. It becomes critically important with LiPo batteries since you can permanently damage them by running the voltage down too low. Typically battery voltage detection requires adding a circuit with extra parts and their associated power requirements. Wouldn’t it be great to be able to do this using nothing but software? Read on for a no parts, no pins, no power solution…
Battery fuel gauge with zero parts and zero pins on AVR - [Link]
Using the cirrus logic CS5464 for AC current measurement by Corgi-Tronics:
Continuing the series on examining devices to measure AC current, this time we’ll try out the CS5464 from Cirrus Logic. I initially built it up on a breadboard, but I’ll skip writing up this test and instead build up a prototype and run AC line power through it.
This is a Three-channel, Single-phase Power/Energy monitoring chip, and also can use current shunts and is intended for power meters.
This device provides no direct isolation, instead the entire device (input and output) directly coupled to the AC power line. Any isolation must be provided separately.
Using the cirrus logic CS5464 for AC current measurement - [Link]
Luca Dentella build an ethernet shield based on the ENC28j60 driver from Microchip.
SDWebServer is a complete webserver that can retrieve static elements from an SD card (including a user-defined default webpage) and can also create dynamic pages. This is the latest post in my tutorial about using ENC28j60-based shields with Arduino.
SDWebServer – enc28J60 and Arduino - [Link]
Representatives from the Fraunhofer Institute for Photonic Microsystems IPMS in Dresden will be showing off their Li-Fi wireless communication system at the upcoming electronica exhibition held in Munich from November 11 to 14. The system uses infra-red light as the transmission medium and can transfer data at a speed of up to 1 Gigabit per second over a distance of up to 10 meters.
Li-Fi Goes Live at electronica - [Link]