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The Aurabean Project

The Aurabean is a small hand held device for testing randomness, luck and synchronicity. The device consists of a softpower latch circuit, two buttons, and a ATTINY13A microcontroller. The microcontroller determines whether the device remains on or turns off, and records the score of the player in terms of correct sequential guesses.

Aurabean Device Version 8

Artistic Design

An artistic shape has been used influenced by the local indigenous culture. The PCB was manufactured by Oshpark using the After Dark option.

5 September 2023

Colour-Coded Score

The device now uses two WS2812C LEDs to indicate colour-coded scores ranging from red through green and blue to purple.

6 February 2023

Refined for Production

The second run of manufactured devices have been delivered. They incorporate a PCB mounted coin cell holder to simplify the design and enclosure development.

3 November 2022

Manufacture Completed

Our first manufactured devices have been delivered.

11 September 2021

PCB Assembly Run

We have started a production run of 30 units with our manufacturers in China. The cost per unit is quite high in small quantities but this will enable us to carry out further product development and market research.

12 August 2021

Prototype 5

Some minor changes are needed to the switches but otherwise the prototype connects well to the online database through HTTP GET requests.

25 September 2020

Model of Prototype 5

A model has been created in Rhino3D so enable visualization of some layout revisions. The new PCB has been sent for manufacture.

21 September 2020

Prototype 4

Version 2.0 has been made and we are now testing the circuit and software, as well as assessing usability before refining the design to fit in a handheld enclosure.

12 September 2020

CircuitMaker PCB Design

We have used CircuitMaker to develop the PCB for the Wipy daughter board. This board contains a softlatch circuit, LiPo battery, USB charge circuit, and Infrared LEDs.

20 August 2020


After a long break working on other projects, we have returned to redesign the Aurabean to include Wifi using the Pycom WiPy3 module. The breadboard shown here prototypes the Wipy with our softlatch module.

9 August 2020

AuraBean Website

Our AuraBean website is up and running. It is planned that this will to be the front end for product sales and information.

31 March 2017

Prototype 3

We have revised the design to incorporate lower cost parts including the use of the ATtiny13A microcontroller.

28 July 2016

Fits Case

It fits the enclosure, but more detailed work is required.

11 June 2016

3D Printable Case

A more fitted enclosure has been designed and sent off to 3DPrint-AU for printing.

10 May 2016


This is an illustration of a simple enclosure suitable for 3D printing. The two halves fit together with holes aligned for the buttons and LEDs.

19 December 2015

Prototype 2

Here's revision 2 with dual buttons and LEDs. This model gives better feedback and allows the device to record your score. Also included is a switching output that can drive a small vibration motor or buzzer.

26 August 2015

First Scores

The scores at the moment appear to be no better than chance. However, getting 8 guesses correct in a row during a sample run of 24 attempts is interesting. In revision 2 we will try using two buttons to simplify automatic recording of the score.

22 August 2015

Field Trials

Field trials have begun to test if a probability of better than chance is possible when guessing if the device is turned on or off.

10 August 2015

Test Code Working

The PCBs have arrived and we've put one together. All those extra wires just facilitate USB 5V supply to the 3.3V power system so that we can prototype code without needing batteries.

31 July 2015

First Prototype Manufacture

The first prototype circuit boards have been sent to China for manufacture and should be ready to be assembled and tested in a couple of weeks.

24 July 2015

Soft Power Latch Works

The soft power latch works on paper. We've drawn the circuit using the Circuit Scribe conductive ink pen on paper and soldered some components in place. A momentary press of the ON button turns the circuit on, whilst the KILL button turns the circuit off.

23 July 2015

Power Circuit Simulated

We found a soft power latch circuit on EEVblog that is exactly what we are looking for. One momentary press of the power button turns the circuit on, and another button turns it off. The circuit draws no power when off, and allows the facility for a microcontroller to monitor the on button and turn the circuit off itself.

17 July 2015

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