Tech Marinade
Uncovering Hidden Innovation in DIY Electronics
Tutorial Roundup #4: Instruments!
by Ryan Sailor ▪ 11.15.2013 Features

Instrumentation is expensive. A decent desktop oscilloscope can run well over $300. When you don’t have the cash to spend on instrumentation to test your creations, what must a Maker do? Build your own, of course! This week, we have collected three tutorials to help you Make the tools you need to analyze and test your projects. Continue Reading

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The All-In-One Card Startup Coin Offers An Arduino Bluetooth Low Energy Developer Kit
by Kyle Patrick Cayabyab ▪ 11.14.2013 News

coin_productIf you haven’t already heard, there is this new card that has been developed, and it isn’t of the Pokemon or Magic variety. This card can act as a representative of your entire wallet and be programmed to swipe as your credit, debit, or loyalty cards and more! This convenient marvel that does away with thick wallets is called the Coin. By using the Coin mobile app and a swipe dongle on your smartphone, you can upload your various cards onto both the app and your Coin device. All you need to do is swipe your card through, take pictures of both sides, and fill in the rest of the details. The mobile app can hold an unlimited number of card data and you can add up to 8 cards onto your Coin device. When it comes time to make your payment, you can simply choose which card you need using the interface located on the card and swipe. And if you happen to stray away from the card, the mobile app will warn you that you may have lost your Coin device. This is done via a Bluetooth Low energy (BLE) module that Coin developed themselves and now offers a kit for others to use!

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Introduction to Color Sensors – ADJD-S311 (Part 2)
by Ryan Sailor ▪ 10.18.2013 Learn

The ADJD-S311 is a chip you can use to easily add color sensing to any project.

In part 1 we reviewed the ADJD-S311 color sensor and set up our breadboard to light an RGB LED with the color detected by the sensor. In this article, we will program our Arduino/Teensy to calibrate the ADJD-S311 and run our program. I will make the assumption that the reader (you) already understands how to program their device of choice.

The Arduino code has two steps: first the sensor is calibrated against a known white surface or object, next the program runs in a loop, converting the sensor readings to values to output to the RGB LED.  Calibration is an important step if you do not want to manually change the sensor’s internal values each time you use the color sensor.  We can easily leave this task to the Arduino, which if coded properly can calibrate the sensor for use in less than a second.  Fortunately, the calibration process is simple and does not require many lines of code.  Let’s get started!

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