Final Project¶

Composite Sensing Coffee Table¶

Composite coffee table with a Fablab logo light up when people approaching.¶

And Control via bluetooth to turn on or off.¶

Done by someone before.¶

Tomer Weller
Jeffrey
Jain

Answering questions¶

What will it do?
Light up a logo when someone approaching to a coffee table.
Who has done what beforehand?
Tomer Weller, Jeffrey, Jain and more people had did a coffee table.
What will you design?
A coffee table with smooth surface.
what materials and components will be used?
Epoxy, paper and electronics.
Where will they come from?
From local retailer.
How much will they cost?
Around a hundred.
What parts and systems will be made?
Table, leds, controller and interface.
What processes will be used? Composite and bluetooth.
What questions need to be answered?
None.
How will it be evaluated? Can It lights up when people walk-by.

Licence and spread¶

It will be just publish to web, no further commercial plan.
Someone may ask a customize work.

Any can share it under CC Attribution-NonCommercial 4.0 licence.

BOM ¶

updated 6.23.2019

Material provider¶

Most provider for the BOM have serched on a P2P shopping website for cheaper cost.
They are unstable bissness or personal seller keep change what they sell.
For the building tint, search “build tint black silver” to find someone near you.

Composite part¶

Parts	Spec.	Quantity	Approx. cost
paper	600 x 900 mm 100p	many	10
Epoxy Resin	40min operate time	~3750g	90
Building tint	-	1500 x 800 mm	20
gift paper	silver	1	1

Electronics part¶

Parts	Spec.	Quantity	Approx. cost
ATtiny 44a	-	1	-
Capacitor	105 (1uF)	1	-
	18 pF	2	-
Crystal	20.0 M hz	1	-
HC-05 module	-	1	3
LED tape	12V width 5mm	1.5 m	10
Pin header	1x6	1	-
	1x4	1	-
	2x3	2	-
Resistor	10k ohm	1	-
	1k ohm	1	-
	o ohm	1	-
Relay module	5V	1	2
Transformer	DC 12v to DC 5v	1	1
	AC 110v to DC 12v	1	3

Design¶

See Week 18 for detail.

Draw the shape of desktop.

The legs.

And the bottom.

Design of the table done.

Make slices

Arrange pieces for cut.

Make the table¶

See Week 18 for detail.

Send to vinyl cutter and cut it.

Put them together.

Adding layers.

Add a shiny gift paper as bottom reflector.
It is also good as a finish work but not done yet.

Install a shiny gift paper and LED tape.

Cover the top reflector.

Electronics¶

See Week 14 for detail.
Design by Eagle.

Change Led by a relay module to control 12V Led tape.

Draw and make a box to packing board.
updated 6.23.2019

Put the electronics into the box.

Attach to the table.

Programing¶

See Week 14 for detail.

Because of the Attiny44a will read wrong message if too many “if loop” in code,
the power button of UI does not have its code.

/* Write by Weng, Wei-Sung at Fablab Taipei for fab academy 2019
 * CC BY-NC 4.0 licence 
 * Acknowledgement: 
 * Devon Hsin (Maker Xin @ Facebook) - helps for debug.
 * Hazim Bitar - Bluetooth communication.
 * Tom Igoe - Serial Event example.
 */


#include <SoftwareSerial.h>
SoftwareSerial BTSerial(1, 0); // RX | TX
char sense = 1;

void setup()
{
  BTSerial.begin(38400);
  pinMode(2, INPUT);
  pinMode(3, OUTPUT);
}

void loop()
{
  // lights up if motion detector works
  if ((char)sense == '1') {
    if (digitalRead(2) == HIGH) {
      digitalWrite(3,HIGH);
      }
      else {
        digitalWrite(3,LOW);
      }
    }
    else {
      digitalWrite(3,HIGH);
    }
  // Bluetooth control
  if (BTSerial.available()){
    char data= (char) BTSerial.read();
    if ( data == 'c'){
      sense = '1';
    }
    else if (data == 'd'){
      sense = '0';
    }
  }
}

Make and programing it.