Fully Assembled Solar Cell Controller Board and Sun Tracker for Arduinos /Raspberry Pi / Phone Charging. Plus Open Source Drivers.
Ever wanted to build your own Solar Powered Raspberry Pi or Arduino system? That is what this Kickstarter is all about!! SunAir and SunAirPlus are 3rd Generation Solar Charging and Sun Tracking Boards designed by Dr. John C. Shovic at SwitchDoc Labs.
You can use this board to power your projects and add a servo or stepper motor to allow it to track the sun using photoresistors to generate even more power! It incorporates a number of outstanding features in a very compact, inexpensive single fully assembled and tested PC Board.
SunAir Solar Power Controller Board/Tracker/Phone Charger – [Link]
by Dan Meeks @ edn.com:
A long, long time ago there was a great Design Idea for a simple gadget to find a bad bulb in a series-connected string of Christmas lights. This is really simple and works great, but it exposes the user to potentially lethal line voltages. The PROBE in the figure above is inserted into the light bulb bases, so there is a good chance that you could be touching a part of the probe, while the probe is touching line voltage.
Bad-bulb finder fixes Christmas lights – [Link]
… and will prevent to spread there, where you don´t want to. Fluxes in pen Stannol series Mini Fluxer belong to the invaluable helpers of every electro-technician.
How could I work without a flux so far? That´s a probable question of probably everyone, who once tried action of a solder flux. In a common wire solder, there´s some amount of a flux, usually sufficient for one-time soldering of a given joint, if the components to be soldered are clean and oxides-free. However, we know well a case, when we use for example an older PCB, or an older component with slightly oxidized leads and suddenly it´s much harder to reach an acceptable joint. Similar situation happens at an exchange of a component or any service action, when a solder tends to oxidize on a surface and create various bad-looking creatures, which are quite far from a professional joint. Fortunately, there´s a flux here …
In general, fluxes act in a manner, that a solder is as if „more movable“ after application. It is mainly thanks to the protection against oxidation, change of surface tension and other influences. As a result it means, that a solder spreads well on metals and joints with a given material (what we naturally want) and on the non-metal substances (PCB) is a solder repelled as if on an oily surface.
At an automated „all-surface“ soldering, fluxes are usually applied by wetting (foam) or by spraying. At development and servicing smaller packages are much more practical, for example in a form of a pen. Two novelties in our offer also belong to this category:
- Stannol MINI-FLUXER X32-10i – halogen free, activated „No clean“ flux, practically residue-free, vey tolerant to various working conditions. Minimum amount of electrically safe transparent residues with a high insulation resistance enables its usage even at visible places and at production of highly reliable devices, including solar panels. Significantly eliminates build-up of bridges, that´s why it´s very suitable even for manual soldering of fine-pitch components.
- Stannol MINI-FLUXER X33S-07i – highly activated halogen-free „No clean“, resin-free flux, with a corrosion inhibitor, very suitable even for copper surfaces – clean, passivated or lacquered by rosin-based agents. Excellent wetting even on poorly adherent surfaces. Excellent spreading manifests by for example trouble-free filling of vias by a solder.
Stainless steel spring mechanism of a pen enables simple and precise dosage and also a long pen lifetime. During application, it´s only necessary to softly press on the tip. Both fluxes are in our stable stock offer, available immediately or in a short leadtime (in case of a temporary out-of -stock status).
Mini Fluxer will spread solder there, where you want – [Link]
by noelportugal @ instructables.com:
The day I read that a new $5 wifi module was available, I order a few of them to test. Now, a few weeks later I want to share my experience.
This is a very simple demo using the ESP8266 and Arduino to update a remote server (https://thingspeak.com/) using a digital temperature sensor.
ESP8266 Wifi Temperature Logger – [Link]
After finishing my last project – “Simple LC meter“, there were some discussions in the forum I am a member of, that ability to measure electrolytic capacitors would be very useful in this type of device.
I searched the Web and found a very cute project named LCM3 on this Hungarian site: hobbielektronika.hu . I love Hungarian rock since my school days, but I don’t know a word in Hungarian . So, I searched the Web again, this time for this specific project and found a Russian forum where the project was discussed in details and I got more useful information about parts, settings and so on.
Advanced LC meter – [Link]
The first approximation is based on a modification of an expression developed by Wheeler; the second is derived from electromagnetic principles by approximating the sides of the spirals as current-sheets; and the third is a monomial expression derived from fitting to a large database of inductors (and the exact inductance values).
Single layer Planar spiral coil inductor calculator – [Link]
by Kenneth Wyatt @ edn.com:
The spectrum analyzer has always been a vital tool for the EMC engineer. Until the last few years, these instruments have been rather large and heavy desktop instruments, weighing up to 60 pounds, or more. With the breakthroughs in components used for wireless technology, the size and weight of these instruments has decreased dramatically. This is good news for product designers whose workbenches may already be cluttered with other test instruments or for those like myself who work a lot in the field or travel a lot.
Tektronix RSA306 spectrum analyzer Review – [Link]
by Susan Nordyk @ edn.com
Based on a four-switch single-inductor architecture, the LT3790 synchronous buck-boost DC/DC controller from Linear Technology accommodates an input of 4.7 V to 60 V and delivers up to 250 W of continuous power for use in a variety of automotive and industrial applications. The device operates from input voltages above, below, or equal to the output voltage, making it well-suited for automotive designs where the input voltage can vary dramatically during stop/start, cold crank, and load dump.
LT3790 – 60V Synchronous 4-Switch Buck-Boost Controller – [Link]
Hey, sorry everyone, I know it’s been a while. But I hope this post will make up for that! Anyone who has done embedded programming knows that an easy way for microcontrollers (like arduino) to connect to a PC is through a serial connection. Unfortunately, not many computers have a serial port these days, and while are a lot of chips that will act like a usb-serial converter, they tend to be somewhere in the $3-5 range. However, I found one chip, the CH340G, that only costs 40 cents!
CH340G – alternative USB to serial IC – [Link]
by jmacarthur @ github.com:
The Zeta is a minimal Z80 toggle-switch computer. It has a Zilog Z80 microprocessor, 256 bytes of RAM and the only interface is the front panel which directly sets and reads the address and data buses.
At the moment, there is only one real source file in this repository, an Inkscape-produced SVG which contains the stripboard layout and lasercut paths along with the image for the box top. In the future I’ll try to add a KiCad circuit diagram. This file doesn’t preview well in github because there are some very thin and zero-width lines – turn on outline mode (View -> Display mode -> Outline) in Inkscape to view it.
The Zeta minimal Z80 toggle-switch computer – [Link]