Sound activated switch

in DIY, sensors by DP | 0 comments

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A sound activated switch project by Rajkumar Sharma of Electronics Lab:

Clap switch/Sound-activated switch designed around op-amp, flip-flop and popular 555 IC. Switch avoids false triggering by using 2-clap sound. Clapping sound is received by a microphone, the microphone changes the sound wave to electrical wave which is further amplified by op-amp.
555 timer IC acts as mono-stable multi-vibrator then flip-flop changes the state of output relay on every two-clap sound. This can be used to turn ON/OFF lights and fans. Circuit activates upon two-clap sound and stays activated until another sound triggers the circuit.

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Reverse engineering a wireless soil moisture sensor

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Ray Wang at Rayshobby has been working on reverse engineering a wireless soil moisture sensor. He writes, “At the Maker Faire this year I got lots of questions about soil moisture, which I knew little about. Recently I started learning about how to build my own soil sensor, and came across this cheap 433MHz wirelss soil sensor available from Amazon. I’ve experimented with some similar wireless sensors (temperature, humidity, rain etc.), so it didn’t take me long to figure out the signal encoding pattern of this one. I wrote an Arduino program (also adapted to R-Pi) to listen to the sensor and print out the soil moisture level to the serial monitor. This provides a convenient and low-cost solution to integrate soil sensors to my home automation projects.”

Via the contact form.

New microchip promises to streamline and simplify diabetes diagnoses

in Chips by DP | 0 comments

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Dr. Brian Feldman and his team at Stanford University have developed a new microchip. It promises to streamline and simplify diabetes diagnoses. Ben Coxworth of Gizmag writes:

For people who don’t already know, here’s the difference between type 1 and type 2 diabetes: the body produces little or no insulin in the case of type 1, and isn’t able to utilize the insulin that it does produce in type 2. It’s a significant difference, so it’s important that patients are diagnosed correctly. Thanks to a new microchip developed by a team at Stanford University led by Dr. Brian Feldman, doing so could soon be quicker, cheaper and easier than ever before.

Via Electronics Lab.

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Light Appliance – Remote controlled 32×32 RGB LED Matrix

in DIY, infrared by DP | 0 comments

FrontViewOnSmall

IR remote controlled light appliance application for the 32×32 RGB LED Matrix by Craig Lindley, that is available at Github:

My latest creation, the Light Appliance. This device displays various graphical routines (plasmas, fractals, etc.), animated GIFs, displays time, date and temperature, can be an open or closed sign for a business and a mood light. This is a quick demo to show what it can do

Check out the video after the break. Continue reading →

Lasercut strip feeder for your pick & place

in DIY by DP | 0 comments

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Do you need a strip feeder for your pick & place?  Felix of LowPowerLab  shows you how to easily make a DIY strip feeder:

So let’s make a strip feeder. I have lots of components that are less than a full reel (exotic resistors, transistors, crystals, caps, mosfets etc). Most of these are 8mm and 12mm tape, rarely 16mm. So it would be perfect to have a strip feeder that can be placed in a fixed position in the machine. To reload you just cut the pre-determined length, feed it through and align the first pocket to a marker on the side, reset component count for that row, and machine already knows where to continue, quick and easy.

Check out the video after the break. Continue reading →

Digital Zoetrope

in DIY by DP | 0 comments

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Sholto wrote this instructable detailing the build of his digital zoetrope:

A zoetrope is a mechanical device that animates a series of pictures by spinning them fast enough that the images appear to merge together and move, My digital zoetrope works on a similar principal, by flashing the LEDs while they are spinning it is possible to display text, patterns and possible even simple animations. My design uses an Arduino Pro mini powered by a system of brushes and a magnet and hall effect sensor for position detection.

Check out the video after the break. Continue reading →

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How to recover a laptop after a failed BIOS update

in Bus Pirate by DP | 1 comment

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Viktor describes on his website how he used the Bus Pirate to recover a laptop after a failed BIOS update:

Once I had to open the laptop to fix it I decided to take this opportunity to explore the options there are for fixing the broken BIOS and compile my findings in this article. In the process I tried all of the methods described below, some on the actual laptop I fixed eventually, some on (really-really) dead motherboards.
There are several ways of getting the right BIOS back in the computer – in the following I am going to present a number of ways to get your laptop back on its feet. There are probably more ways to do it, but this should be a good starting point for someone in the same shoes as I was.

Via the contact form.

Get your own handy Bus Pirate for $30, including world-wide shipping. Also available from our friendly distributors.

Posted in Bus Pirate | Tagged , | 1 Comment

Yet another laser cut Open Bench Logic Sniffer case

in cases, Logic Sniffer by DP | 0 comments

 

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Yet another laser cut Open Bench Logic Sniffer case by builttospec:

This one is a bit thinner thanks to the use of brass inserts and 0.06″ acryic for the board layer. The PCB is nice and secure and the buttons are easily accessable without the use of a paper clip or big holes in the case for fingers.

More awesome DIY cases.

Get a Logic Sniffer for $50, with free worldwide shipping.

Mini FM transmitter

in DIY, hacks by DP | 0 comments

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electronics-diy shows you how to easily make a mini FM transmitter:

It transmits FM waves so you could easily receive the signals on your mobile phone, radios, etc. As the name and the picture indicates it is very small and is approximately the size of a 9v battery clip. With this FM transmitter you could start your own mini FM station. The circuit uses BC547 transistor to amplify the signal and then frequency modulate it. It uses “frequency modulation” most commonly known as FM, the same principal to transmit audio signals captured by the microphone.

Components
BC547 Transistor
An microphone
A variable capacitor 47pf
An Inductor (see steps for description)
4.7k Resistor
330ohm resistor
1n capacitor (102)
10p capacitor
9V battery
LED(optional)

Via Hacked Gadgets.

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How to hack a manual control into a cheap DMX dimmer

in hacks, how-to by DP | 0 comments

SAMSUNG

This article shows how to hack a manual control into a cheap DMX dimmer by Miceuz and Rxdtxd of wemakethings;

One of our friends wanted to have a manual-control LED dimmer for his stop motion setup. We had several of these cheap Chinese DMX dimmers. How does one adds potentiometer control to something like this? Just cut a trace from the RS485 transceiver into the unmarked micro, add another micro to act as a DMX master, and patch into the serial line via a SPDT switch.
The hacked-in micro just reads three potentiometers via ADC and spits their values into the DMX bus. We’ve found some DMX master code online and copied some stuffs into it

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#FreePCB via Twitter to 2 random RTs

in Free PCBs, PCBs by DP | 0 comments

irtoyv3

Every Tuesday we give away two coupons for the free PCB drawer via Twitter. This post was announced on Twitter, and in 24 hours we’ll send coupon codes to two random retweeters. Don’t forget there’s free PCBs three times a every week:

  • Hate Twitter and Facebook? Free PCB Sunday is the classic PCB giveaway. Catch it every Sunday, right here on the blog
  • Tweet-a-PCB Tuesday. Follow us and get boards in 144 characters or less
  • Facebook PCB Friday. Free PCBs will be your friend for the weekend

Some stuff:

  • Yes, we’ll mail it anywhere in the world!
  • Check out how we mail PCBs worldwide video.
  • We’ll contact you via Twitter with a coupon code for the PCB drawer.
  • Limit one PCB per address per month please.
  • Like everything else on this site, PCBs are offered without warranty.

We try to stagger free PCB posts so every time zone has a chance to participate, but the best way to see it first is to subscribe to the RSS feed, follow us on Twitter, or like us on Facebook.

Sniffing I2C traffic with a Bus Pirate

in Bus Pirate by DP | 0 comments

IMAG0581

Joshua shows us how he sniff the I2C traffic with the Bus Pirate:

As far as wiring and software setup, it’s the exact same from the previous post with the exception of adding on the Bus Pirate connections to the SDA and SCLK pins, along with a ground. Also, I swapped out the Bus Pirate from being my Serial to USB converter in order to be the I2C sniffer and used a MCP2200 Breakout Module instead.

Get your own handy Bus Pirate for $30, including world-wide shipping. Also available from our friendly distributors.

DS3232 clock frequency calibration

in Arduino, AVR by DP | 0 comments

DS3232Cal_1

Kerry Wong writes:

DS3232 is an extremely accurate RTC with a guaranteed accuracy of 2.5 ppm (0 °C to 40 °C), which translates into an error of just 80 seconds over the course of a year under the worst case scenario. I had done a few projects using this chip before (you can read about them here).
While by default DS3232 is already very accurate, we can push its accuracy even higher by adjusting its aging offset register (8bit). This adjustment works by adding or subtracting the corresponding capacitance to or from the oscillator capacitor array. The adjustable range is represented as 2′s complement (-128 to 127) and each LSB change corresponds to roughly 0.1 ppm of change in frequency. So the overall adjustment range can be achieved programmatically is roughly ±13 ppm.

Check out the video after the break. Continue reading →

PIC-18 Breakout with ICSP

in DIY, PIC by DP | 3 comments

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A breakout for 18 pins DIP package Microchip PICs by Electropepper, he writes:

I needed to make a small test on some old chips i had, so i came up with a quick hour and half, break-out board for most PICs DIP-18 sockets. I also included an ICSP header.
I have been using this mostly to PIC16F88 and PIC16F628a, and it should be compatible with most 18 pins 16f family of microchip PIC microcontrollers.

 

 

Flux capacitor – Back to the future

in DIY by DP | 0 comments

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n1cod3mus made this flux capacitor from Back To The Future.  He writes a complete step-by-step guide on the Instructables site:

Since the release of the film back in the 80s I have been obsessed by the film Back To The Future watching the trilogy repeatedly. I watched it at the cinema over and over, I was very lucky that my great uncle was a projectionist so I could just sit in show after show.
So about 10 years back I decided I wanted to build a flux capacitor, but I got stuck back then because I didn’t have the correct skills at that time and I was making a mess of it, so I shelved the project.
I decided to come back to it with my now improved skills and technology, and this time I have something awesome!!

Check out the video after the break. Continue reading →

LM386 low voltage audio power amplifier

in DIY by DP | 2 comments

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Zx Lee published a low voltage audio amplifier build:

Today, I am going to share on how you can make a low voltage audio amplifier. For this project, I am using LM 386 Audio Amplifier, which is commonly used among electronics hobbyist. I will break the article into a few sections. First, I will explain about the LM 386 chip itself. Then move on with some explanation on the parts used in this project. And finally, the design of audio amplifier.

Check out the video after the break.

Continue reading →

Posted in DIY | Tagged , | 2 Comments