ARPM: Another Raspberry Pi Microscope


Dr H @ build a Raspberry Pi based microscope using a WaveShare B-camera and plexiglass parts. He writes:

Based on the RPI camera and LEGO brick-based microscope I presented earlier ( A-Raspberry-Pi-camera-based-microscope-built-from- LEGO ) I have constructed a similar microscope build from Plexiglas parts. So you may build your microscope even w/o having a LEGO collection. What is missing so far is the adjustment gears of the LEGO version.

The maximum resolution is about 5 µm/pixel. On high resolution only a small area will be in focus and you will see an effect called chromatic abberation.

Below you will find a description of the device and the information required to build one on your own.

ARPM: Another Raspberry Pi Microscope – [Link]

DIY Sunlight Simulator – Light Therapy Light

DIY Sunlight Simulator Light Therapy Light banner

Luke Skaff @ decided to build a DIY Sunlight Simulator using wide spectrum filament lamp to be used as light therapy for Seasonal Affective Disorder. During the process he checks for various kinds of lamps and examines their light spectrum. He writes:

Sunlight simulation light boxes are commonly used as light therapy for treatment of Seasonal Affective Disorder (SAD). My mom has SAD and after seeing her wimpy light box I thought there had to be something better out there, after some research I was really surprised at the underwhelming sunlight simulator light therapy options on the market. When I started this project my parents lived in the Northern Virginia \ DC area of USA where there are many overcast days in the winter months. I love bright work lighting and lighting in general so part of me was happy that was not there was not a good option available on the market so I could be creative and make my own for her. Most light therapy boxes use fluorescent lighting which I have never liked due to its spikes in a few bands on the spectral power distribution (spectral distribution or emission spectra, discussed below). I love the full spectrum light of incandescent and halogens but to get a light bright enough to work for light therapy I needed a bulb in the 1100 watt halogen or 1500 watt incandescent range at minimum (likely much higher for ideal lumens) which is impractical in its power consumption and heat output. The best all around option is a high intensity discharge (HID) light such as a ceramic metal halide which have some of the best Color Rendering Index (CRI), spectral distribution, lifespan, and cost of any non-incandescent light source.

DIY Sunlight Simulator – Light Therapy Light – [Link]

Makerarm: The Robot That Can Make Anything!

A complete digital fabrication system for makers everywhere: 3D print, laser, carve, plot, assemble, pick/place + more on your desktop!

Makerarm: The Robot That Can Make Anything! – [Link]

Arduino LED Wall clock using WS2811


This is a big LED digit wall clock based on Arduino and WS2811. Features :

  • big digits ( each digit is approximately the size of a A4 paper).
  • slim in order to fit in a photo frame (a big one).
  • auto dim the light depending on the light in the room.
  • dedicated DST button.

Arduino LED Wall clock using WS2811 – [Link]



Digital Panel Meter performs digital processing on or conversion and display of voltages, currents, other analog signals, and pulse signals. This project is based on popular ICL 7107 IC, which is analog to digital converter and has been designed to drive 7 segment LED display. The ICL7107 is high performance, low power, 3, 1/3 digit A/D converter. Included are seven segment decoders, display drivers, a reference, and a clock. This DPM project may be used in a wide variety of configurations Full scale reading of +/- 199.9mV (200mV)


  • Supply 5V DC @ 80mA.
  • Range 0 to 199.9mV (200mV)
  • Low Current consumption
  • Low input leakage current because external reference
  • Single supply operation
  • On board Jumpers for range display
  • Auto Zero and auto polarity within IC
  • Supply Input CN2 5V DC
  • Test Voltage CN1 0-200mV
  • PR1 Preset for reading calibration.

Digital Panel Meter – Voltmeter – [Link]

Arduino IDE 1.6.6 Now Available for Download


Arduino IDE latest version is ready for download.  New features include the arduino-builder tool for command-line fans, a nifty Serial plotter that should help with visualizing sensor readings and tons of bug fixes. From the Arduino blog:

Today we are very proud to release Arduino IDE 1.6.6 and updated cores for all supported platforms (AVR 1.6.9, SAM 1.6.5, SAMD 1.6.2). This update brings an impressive 723 closed issues and 147 pull requests merged.

Arduino IDE 1.6.6 Now Available for Download – [Link]

Building a SmartWatch


Benjamin Blundell has been working on his DIY smart-watch:

I have an issue with smart-watches. Watches in general fall into one of two categories: a tool to tell the time, or a fashion statement. Increasingly, I believe the latter category is larger than the first. With the advent of the iWatch, Pebble and the like, fashion and making a statement has moved into technology. It’s not quite a new thing but nevertheless, it’s something I’m not too fond of. My solution? Make your own smartwatch.
There is a precedent for this. Steve Wozniack sports a pretty fly nixie tube watch which he made himself. It’s pretty cool, but also a statement of sorts too. I’ve been meaning to up my game with electronics anyway, so I’ve been working on a few initial prototypes.

Building a SmartWatch – [Link]

Real Time Monitoring Of Crop Health using Intel Edison


by ssarthak598 @

The idea is to make a hardware + mobile app which could be used by farmers, can update farmers with any issues with their farms and can analyse amount of sunlight, rain, soil moisture, pH and can suggest best fertilizers according to the data from the sensors. It can also compare the data with the local weather data for that GPS location. The app will also have real-time updated selling prices of crops for the farmer.

Real Time Monitoring Of Crop Health using Intel Edison – [Link]

5V & 12V Regulated Power Supply


This project can be used to power up TTL and CMOS based projects, it provides 5 VDC & 12 VDC outputs with an onboard mains transformer.  The project is based on the industry popular 7800 series voltage regulator in TO220 packages.


  • Input: 240 VAC
  • Output: 5 V, 12 V @ 600 mA regulated low ripple DC voltage
  • Thermal overload/short circuit protection (provided by IC feature)
  • Power Battery Terminal (PBT) for easy input and output connection
  • External On/Off switch connection possible
  • LED indication for outputs
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 87 mm x 49 mm

5V & 12V Regulated Power Supply – [Link]

Light and Dark Sensitive Switch


Light / Dark Sensitive Switch project is a simple project which operates a relay when the light falling on the LDR goes below or goes above a set point.

  • Input – 12 V @ 50 mA
  • Relay output – SPDT relay
  • 2-in-1 kit, either as light sensitive kit or dark sensitive switch
  • Onboard preset to set the level
  • Power-On LED indicator
  • Relay On LED indicator
  • Power Battery Terminal (PBT) for easy relay output connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 50 mm x 54 mm

Light and Dark Sensitive Switch – [Link]