SUF shared his voltage reference project in the forum:
To achieve the things above I designed a small battery good indicator circuit with a zener an opamp two LEDs and a few resistors. If you switch it on and the battery fall below 8V the red LED will lit instead of the green. I wanted to have a SOB style case. I designed a new one with a trick on it. I used a third acrylic plate what has a hole inside. The hole can accommodate the battery and the battery clip. This setup keeps the battery in place.
Voltage reference project - [Link]
Felix of LowPowerLab writes:
I’m calling it MotionMote because it detects motion and because pretty much every type of wireless sensor or Moteino node name ends in “mote“. The possibilities for home security are endless, put this little guy in a corner near a door or on top of a cabinet somewhere and detect them intrudaz! Did I say there’s no wires?
Read on for details and source code and case design.
MotionMote – Moteino motion sensor - [Link]
Here’s a low-cost single phase energy metering solution using Microchip’s MCP3909 metering ADC and PIC18F25K20 8-bit microcontroller. App note can be found here.
The meter was tested for a range of current from 0.1A to 20A using the Fluke 6100A Electrical Power Standard. Measurement results are visible on the LCD or on the Pulse Output. This document is intended to provide guidance for designers who are interested in using Microchip’s MCP3909 Metering ADC with synchronous sampling and PGA on current channel, and the low-cost high performance PIC18F25K20 microcontroller.
Low-Cost Shunt Energy Meter using MCP3909 and PIC18F25K20 - [Link]
Video from SOS webinar – The use of oscilloscopes in practice - [Link]
Saelig Company, Inc. announces the availability of the new PicoScope 2000 series oscilloscopes, which are 80% smaller than their predecessors, similar in size to a passport but ¾” thick. Connected to a PCʼs USB port for power and communication, they offer bandwidths up to 200MHz, making them ideal for field use while offering the performance of benchtop scopes. They feature a sample rate of up to 1GSa/s, with high-speed streaming of data up to 1MSa/s, enabling data captures of up to 100 million samples in length. The series incorporate a built-in 100MSa/s or 1GSa/s waveform generator, PicoScope 2000 series oscilloscopes can produce standard signals such as sine, square, and triangle waveforms with programmable sweep, and can also act as a 12-bit 20MSa/s full-function arbitrary waveform generator that can reproduce sampled signals – a very useful feature.
The free PicoScope software delivers an uncomplicated high-resolution visual display, and it incorporates a range of advanced signal processing features: spectrum analyzer, automatic measurements with statistics, channel math, reference waveforms, multiple scope and spectrum views, and serial protocol decoding for I2C, CANbus, SPI, I2S, and UART. Example code is also supplied for those users who want to develop custom applications in C, Visual Basic, LabView, etc.
A Software Development Kit (SDK) is also included, which allows scope control using custom or third-party software. The SDK and PicoScope are Windows-compatible, and example programs in C, Excel and LabView are also provided.
The included PicoScope software for Windows harnesses the PCʼs processing power, storage, graphics and networking capabilities. The user interface is easy for novices to learn, but professional users will find many advanced features including spectrum analysis, persistence display, automatic measurements, advanced triggers and channel math capabilities. Users can download software updates, feature extensions and improvements free of charge.
Made by Pico Technology, Europeʼs award-winning oscilloscope adapter manufacturer, the PicoScope 2000 series is supplied complete with two passive x1/x10 probes and a carry case. They are available now with a 5-year warranty starting at $260 from Saelig Company, Inc. their USA technical distributor. For detailed specifications, free technical assistance, or additional information, please contact Saelig 1-888-7SAELIG, via email: firstname.lastname@example.org, or visit www.saelig.com
NEW PicoScope 2000 series oscilloscopes - [Link]
The Oscilloscope Watch by Gabriel Anzziani of Gabotronics:
The Oscilloscope Watch has all the features of a modern watch (time, calendar, alarm, etc…) combined with all the features of the popular Xprotolab (Oscilloscope, Waveform Generator, Logic Analyzer, Protocol Sniffer, Frequency Counter).
Currently on Kickstarter
The Oscilloscope Watch - [Link]
by Publitek European Editors:
Led by solar photovoltaics, the market for harvesting energy from renewable sources is booming. At the simplest level, a single residence is equipped with a PV system, generating electricity for its own use, and feeding the excess back to the national grid. At the highest level are utility-scale PV plants and solar farms, contributing to improved grid resiliency and helping governments meet global targets to reduce CO2 emissions.
Meanwhile, the smart grid concept is emerging as the way forward to provide a much-needed upgrade to national electrical infrastructures. The deployment of smart meters and off-peak tariffs will help utilities meet peak demands without excessively increasing overall capacity. Techniques such as ‘demand response’ and ‘transactive energy’ will help us exploit renewable energy generation effectively.
Taking the Measure of Photovoltaic System Output - [Link]
The perfect gift for any electronics enthusiast or student. Although small, the Key-Scope performs as a fully functional oscilloscope.
Although small, the Key-Scope performs as a full functioning oscilloscope. You will receive the world’s smallest, high quality, low-cost oscilloscope realized in a key ring-type housing made in Italy. Priced below US$60, it serves as a useful gadget or gift to the electronics enthusiastic hobbyist. Since Key-Scope covers all major functions of a traditional oscilloscope, it also serves as a great tool supporting the electronics student to get familiar working with oscilloscopes.
World-smallest keyring-type oscilloscope with color LCD - [Link]
Kerry Wong built a DIY constant current/constant power electronic load. It can sink more than 200W of power:
A while back I built a simple constant current electronic load using an aluminum HDD cooler case as the heatsink. While it was sufficient for a few amps’ load under low voltages, it could not handle load much higher than a few dozen watts at least not for a prolonged period of time. So this time around, I decided to build a much beefier electronic load so it could be used in more demanding situations.
One of the features a lot of commercial electronic loads has in common is the ability to sink constant power. Constant power would come in handy when measuring battery capacities (Wh) or testing power supplies for instance. To accommodate this, I decided to use an Arduino (ATmega328p) microcontroller.
Building a constant current/constant power electronic load - [Link]
Glyn Hudson over at OpenEnergyMonitor has developed this remote temperature and humidity monitoring node, the emonTH:
The emonTH supports both the DHT22 (humidity and temperature) and DS18B20 either onboard or remote temperature sensor. The default software will search for the presence of either sensor at startup. If both sensors are found it will return humidity from the DHT22 and temperature from the DS128B20. If only the DHT22 is found it will return both humidity and temperature readings from this sensor, finally if only the DS18B20 is found only temperature readings will be returned. In the future I would to expand the code to support multiple DS18B20 sensors on the one-wire bus.
emonTH – Wireless temperature and humidity monitoring node - [Link]