Reddit DIY Electronics contests

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/r/diyelectronics on Reddit currently has two electronics design contests going on:

An Unconventional Clock

Deadline is April 3rd for this beginner contest

The mission here is simple: give me a clock you won’t see in a store.

Perhaps a word clock. A lava lamp water clock. An alarm clock that slaps you in the face and eats your hair (warning: audio). I don’t care.

Buck Regulator Olympics

Deadline is April 30th for this advanced contetst

The goal is to build a switching buck DC-DC converter from discrete components that can step down a fairly common input voltage to another common output voltage–in this case, 3.3V.

 

Reddit DIY Electronics contests

Joe Grand’s Creaturepod

We are big fans of Joe Grand!  You may know him from his awesome designs like Emic 2 Text-to-Speech, Defcon badgesJTAGulator and many more on Grand Idea Studio.  We loved watching Joe introduce cable TV audiences to hardware hacking on the Discovery Channel show Prototype This!

Here’s a fun project from Joe Grand that he has shared on OSH Park:

Creaturepod

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The Creaturepod is a portable walkie talkie system that enhances children’s interactive play. It mimics the fictional Creaturepod from the popular children’s television show, Wild Kratts.

Joe writes:  “The design features an Arduino Mini Pro 328, 2.2-inch TFT liquid crystal display (LCD), DRA818U voice transceiver module, electret condenser microphone, speaker, and buttons for channel/ frequency selection and push-to-talk capability. Bitmap images are stored on a microSD card and displayed on the LCD to indicate the currently selected channel. A 2000mAh Lithium-Polymer battery provides more than 20 hours of playtime before recharging is necessary.”

Documentation links:

Shared Project: Creaturepod

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Joe Grand’s Creaturepod

Self Portrait on Circuit Board

Ronald Sutherland created a PCB with a self portrait on the copper layer:

15027,Assembly (1)

Self Image on Circuit Board

I guess at some point everyone does this…

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Ronald has shared his project on OSH Park:

OSH Park Shared Project

2 layer board of 1.86×2.36 inches (47.14×59.87 mm).
Shared on January 30th, 2015 21:48.

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Self Portrait on Circuit Board

D-DAQ: monitor automotive perfomance

Michael O’Brien created this project to monitor automotive performance:

Hackaday.io: D-DAQ

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“D-DAQ is the new incarnation of the Doniol Boost Gauge. It is designed with around a modular paradigm and high quality parts. Though by it has battery voltage, EGT, Boost up to 85 psi, and a 5V aux sensor of your choosing, it can be expanded via 10 additional analog inputs, 2 impulse inputs, and future CAN integration.”

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“As for outputs, you can add up to 3 OLED displays to view everything on, though this too is not limited to the displays in development.”

Michael made this 2 minute overview video for The Hackaday Prize:

Digital-Corpus has shared several projects on OSH Park including:

D-DAQ Mainboard Proto 4

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Michael wrote about his experiments with plated slots in his hackaday.io project log:

OSH Park Manufacturing

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NOTE: Internal Cutouts and Slots

We officially support non-plated slots and cutouts that are at least 100 mil wide (0.1inches / 2.54mm).

Whenever possible in your designs, we advise replacing small or plated slots with a large via. Typically, setting the hole size equal to the slot length is sufficient to fully replace the feature with minimal design impact.

D-DAQ: monitor automotive perfomance

USB Cable Tester

davedarko wanted an easy way to check a USB cable, so he created this project on hackaday.io:

USB cable tester

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Test your mini, micro and A-A cables with this little device!

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A little ATtiny45, some LEDs and transistors – battery powered. It scans through the cable with some blinking LEDs, then goes to sleep.

 

The design files and source code are shared on GitHub:

/USB-Cable-Tester

 

And the board is a shared project on OSH Park:

USB cable tester

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USB Cable Tester

Vinduino: wine grower saves water

Reinier van der Lee created the Vinduino project (Vineyard + Arduino) to better manage the irrigation of his Southern California vineyard:

Vinduino, a wine grower’s water saving project

Monitoring soil moisture at different depths to determine when to irrigate, and – more importantly – how much water is needed. Save 25%!

Reineir explains further on his project page:

If you want to learn about saving water, talk to a farmer. California farmers, including myself, voluntarily aim to reduce agricultural water consumption by 25%. This reduction is more than the annual urban water use, much more effective than any residential water reduction can achieve.

The project includes:

  • DIY calibrated gypsum soil moisture sensors
  • Hand held sensor reader for soil moisture, salinity & water pressure
  • Solar powered remote sensor platform:
    • 3 electrically separated inputs for soil moisture sensors
    • Wifi (ESP8266) or Appcon RF module for long range connectivity (miles)
    • Irrigation valve control, optional pressure sensor for valve operation feedback
    • DHT-11 temperature/humidity sensor

Vinduino has produced impressive results:

  • In 2015 we saved 25% , or 430,000 gallons, of irrigation water.
  • Cost saving on water and labor was $1,925
  • Cost to achieve these savings was $635
  • Minimum configuration for developing countries, incl. salinity measurement: $60

 

ReiniervdL has shared two project on OSH Park:

Vinduino-R V0.1: Remote soil moisture measurement 

2 layer board of 3.69×3.15 inches (93.65×80.01 mm).
Shared on June 7th, 2015 21:33.

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2 layer board of 2.39×2.00 inches (60.66×50.80 mm).
Shared on June 7th, 2015 21:33.

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Vinduino: wine grower saves water

Sunburn Monitor

This UV monitor on hackaday.io was designed to help prevent UV-caused skin damage:

Sunburn Monitor

 This is a UV monitor based around the SI1132 light sensor and an ATMEGA168. It uses a sound-based interface, where beeps signal settings for skin type and use of sunscreen, if any. This is to save the power and cost of a display, and also in recognition that the device will be used outdoors in bright sunlight, where only reflective displays would be usable.

SI1132 was chosen as it produces a ‘calibrated’ UV index and takes up very little space. ATMEGA168 was chosen as a cheap uC with hardware I2C support which is supported by the Arduino environment (to allow a broad range of users to easily modify the code as they see fit).

The design files and source code are hosted on GitHub:

/Sunburn-Monitor

matrixwide shared the board design on OSH Park:

Sunburn Monitor V 0.2


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Sunburn Monitor