In this video I take a look at the Zener diode used as a voltage reference and the effect of temperature on the stability of the output. (temperature coefficient)
By using a normal silicon diode in series which has a negative temp co you can offset the effect of the Zenner’s positive temp co.
Zener Diode Temperature Coefficient - [Link]
Record attendance and development sets for great prices. Webinar with IQRF about wireless solutions was also about this.
This time, we again realized two webinars during just one day – one in English and one in Czech language.Usually, we draw one winner of development set out of all webinar participants. However this time, all participants had a chance to get DS-START-03 development set for fantastic price.
Did you miss our webinar?
If you missed this webinar, you can check VIDEO-record…
SOS webinar – How can you make a wireless device from your product? It‘s simple! - [Link]
by Sound Guy @ instructables.com:
You may be familiar with a website in the UK called Colour Clock (http://thecolourclock.co.uk/) which converts the time into a hex value and then uses that value to update the background color. It’s very hypnotic and once you get used to how it works you can actually tell where you are in the day just by glancing at the screen from across the room.
I had an Arduino Uno R3 and an Adafruit 1.8″ Color TFT Shield w/microSD and Joystick that I was trying to use for another project that kept stalling out. One night just for fun I decided to see if I could recreate the Colour Clock and it only took a couple hours. If you’re familiar with Arduino you could easily swap parts out for a simple TFT breakout board and something tiny like a Beetle and make a very compact unit. You could even wear it as a badge.
Arduino TFT Color Clock - [Link]
Arduino hacked Ericsson T65 mobile phone GSM remote control. By Konstantinos Kokoras @ youtube.com:
Accepting incoming call from predifined caller and after 2 rings hungs up and turns on a device through a relay.
Also accepting incoming SMS’s from predifined caller and depending from text tuns on or off a device through a relay.
After each command execution it sends back a confirmation SMS.
Unfortunately Ericsson T65 has only PDU mode for SMS.
Arduino hacked ericsson mobile phone GSM remote control - [Link]
by Colin Jeffrey @ gizmag.com:
With LEDs being the preferred long-lasting, low-energy method for replacing less efficient forms of lighting, their uptake has dramatically increased over the past few years. However, despite their luminous outputs having increased steadily over that time, they still fall behind more conventional forms of lighting in terms of brightness. Researchers at Princeton University claim to have come up with a way to change all that by using nanotechnology to increase the output of organic LEDs by 57 percent.
Breakthrough in LED construction increases efficiency by 57 percent - [Link]
by Michael Dunn @ edn.com:
We’re living in a golden age of software, where many useful programs are available – for free!
Let’s survey some of what’s out there that just might interest an engineering crowd like the EDN community.
I can’t offer personal opinions on most of these packages, but I expect to hear back from you after you’ve test driven a few.
Mostly free engineering software - [Link]
A recent press release from Atmel has announced the introduction of the Arduino WiFi Shield 101 which can be connected to any modern Arduino R3 board to give connectivity to the Internet via any traditional Wi-Fi access points. This new Shield is said to offer secure, cost-effective, high-performance Wi-Fi connectivity. The new board is targeted at Arduino IoT applications and incorporates Atmel’s WINC 1500 wireless network controller offering IEEE 802.11 b/g/n (1×1) at up to 72 Mbps and supporting IEEE 802.11 WEP, WPA2 security enterprise.
Arduino WiFi Shield - [Link]
Days get shorter but it doesn´t have to be a problem. At purchase of Wago terminal blocks it´s now possible to gain a quality portable LED lamp.
If we want to bring electric energy to same place, we´ll reach for cables. If we want to interconnect them, we´ll reach for Wago 2273 terminal blocks …
Also this way could be characterized well-known push-wire connectors Wago 2273, as they provide practically unrivalled simplicity of usage at interconnecting of wires in installation boxes. Similar situation is also with Wago TopJob S terminal blocks at installations in distribution boxes.
Wago autumn special offer this time brings a portable LED lamp myLUX Professional (230V, 900 lm, 6000K) with a Li-Ion rechargeable battery (exchangeable) – as a gift to the above mentioned connectors and terminal blocks. If you have 230V mains line available, the lamp works on 230VAC and recharges battery at the same time. At a power dropout or in places without electric energy a battery power can be used. Two sets will be available:
Prolong the short days with a Wago autumn special offer - [Link]
Davide Gironi writes:
A Spark.io library for the BH1750FVI IC.
The BH1750 IC is a light intensity sensor module with built-in a 16 bit AD converter generating digital signal. With the BH1750 Light Sensor intensity can be directly measured by the luxmeter, without needing to make calculations. This library provides function to measure lux through I2C on a Spark Core.
Measure brightness in Lux using BH1750 sensor on Spark core - [Link]
by Suzanne Deffree @ edn.com
Arduino and Raspberry Pi are great, well-utilized DIY boards for hacking just about anything you want to design. But if you’re looking for an alternate hacker board, here are seven that Steve Nelson, Freescale’s director of ecosystem and marketing programs, presented at this week’s Designers of Things (DoT) conference.
With some starting below the $20 mark, these Freescale-enabled, alternative hacker boards are community-supported and allow the transition to low-cost commercial volume manufacturing while still being compatible and easy-to-use, according to Nelson.
7 alternative hacker boards - [Link]