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L3D Cube visualizations Part 1: real-time scatter plot with Thingspeak

November 7, 2015 / / 0 Comments

Overview

Basically a demonstration of the plotting capabilities of the cube. We will retrieve some data from a public thingspeak channel (they correspond to
data points posted by a connected barometer installed in my living room).

The JSON returned by the Thingspeak API is parsed on processing and displayed on the cube. Each serie of data is represented by a 2 voxels thick scatter plot.

The client code on the photon is a variation of the main client: we use the accelerometer data to give the ability to change the plot displayed on the front frames of the cube by tilting it one way or another.

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Make a connected barometer shield for Arduino Uno – using an ESP8266

September 5, 2015 / / 7 Comments

Prologue

I’ve never really considered connecting my projects to WiFi since the price of the shields was so high. The HUZZAH from Adafruit will set you back $39.95. Sparkfun sells this shield for $84.95. Way to expensive.

So you might imagine my excitement when I first heard about the ESP8266 through hackaday. A WiFi module for less than $5, that sounded ideal. I started to read about it, checking out the projects that flourished around this newcomer. It seemed easy enough to use, and I was already imagining how I would start this article. Something like :

“Meet the great ESP8266, a low cost, plug&play device that will allow you to easily connect your projects to the web”.

But things did not go as planned…The first module I bought was defective, and it almost drove me nuts trying to figure out what was it that I was doing wrong. When I started to think about leaving electronics behind forever and starting a new life as a shepherd in South America, I decided that spending an additional five bucks for a new module just in case mine was broken from the start was not too much.

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