Friday, July 10, 2015

Maker Faire Singapore 2015 SP Makers FabLab@SP Makerspace@SP booth

check out our booth at Maker Faire Singapore 2015!

Look out for the laser cut acrylic signage we made with attiny85 ws2812

some of the maker inspired projects you will see at maker faire singapore:
techno mohawk v2.0

attiny85 ws2812 spectrum analyzer

attiny85 ws2812 fastled electret spectrum analyzer

maker faire singapore 2015 sound to light gizmos using attiny85 ws2812 fastled spectrum analyzer

check out the video here:

source code: here

Techno mohawk v2.0 Arduino ATtiny85 RGB LED Spectrum Analyzer

techno mohawk v2.0 for maker faire singapore 2015.
made a maker hat for maker faire singapore 2015.

for more details about how to make it, refer to my blog post 

Saturday, April 25, 2015

3R power bank by Recycling Reusing and Repurposing

3R power bank by Recycling Reusing and Repurposing

Always wanted a 5v 1A mobile power bank to supply projects or to charge mobile devices?

In this post, let's recycle li-ion batteries (18650 cells) from an old Laptop's battery pack into mobile power banks.

WARNING: take extra precautions not to short the VCC and GND of the circuity that wired up the 18650 cells in the laptop battery back. One the casing of the battery pack, there are warnings and cautions.

Remember the Fujitsu E8410 that was broken down to retrieve the tasty bits ?

Remember the LCD panel of the Fujitsu E8410 laptop what was revived as a secondary monitor ?

Yours truly is a hoarder. having break down the E8410 into tasty bits, nothing was wasted, including the battery packs. The battery pack's plastic cover will be pry open carefully to reveal the goodies: 18650 li-ion cells.

please note the each of the 18650 li-ion cells is 3.7v; detail writeup of li-ion battery cells to follow soon.

the objective is to harvest the 18650 li-ion cells from old laptop battery pack. The harvested cells than can be used as the reservoir with li-ion charging circuit that thats input from a renewable energy source such as solar, wind mill, hydro, or even a hamster wheel, and 5v dc booster circuit will provide constant 5V 1A output to power device such as arduino units or even mobile devices.

parts needed
1x old laptop battery pack
1x lithium battery charger circuit TP4056
1x DC-DC boost up circuit 5V BL8531

note: TP4056 and BL8531 circuits are bought from middle kingdom at 68cents and 80ctns respectively.

1. carefully remove the plastic cover of the battery pack. take extra precautions not to puncture or damage the 18650 cells.

2. make sure the work area is free of conductors, eg small metal screws, paper clips etc. carefully remove the 18650 cells from the plastic enclosure

3. At the point of writing, there is a plan for the 18650 cells (in red) above. hence, it is not thoroughly broken down into individual pieces. A detailed step by step guide to break it down will follow in future post.
A regular 18650 cell (in blue) bought from stores will be used as a demo in the following steps.

4. Solder multicore wires preferably AWG10 as leads.
the PCB on the left is TP4056, PCB on the right is BL8531.
A terminal block is used to allow for connection from a variety of clean energy sources eg solar cells, wind mills, hydro, or even human powered hamster wheel. the red and black wires exposed are meant to be connected to the li-ion battery made up of 18650 cells. the regular USB port is the output port.

5. testing of the charging of 18650 li-ion battery cell from a usb source

6. testing of powering up and arduino using the 18650 li-ion cell as supply. note the usb port to charge the li-ion battery is disconnected.

7. testing of charging the 18650 li-ion cell with solar panel rated at 6V and max output of 6.5W. Solar panel courtesy of Mr.Nalpon's stash at T1016 (before he retired).

So, what can you do with it? have an idea on what to make with this setup? ping yours truly.

Monday, March 30, 2015

Seal the Deal: digitally fabricated personal seal using 3D printing, laser cutter, and CNC milling

Seal the Deal: digitally fabricated personal seal using 3D printing, laser cutter, and CNC milling

since young, yours truly always wanted a personal seal. The reasons for a personal seal? it looks cool to "chop" (native colloquial for stamping) a document.

A personal seal consist of 2 parts, the structure of the personal seal aka the body, and the calligraphy used as the seal's signage.

the cost of owning a traditional personal seal is exorbitantly prohibitive. Firstly, the cost of the material for the personal seal. Usually semi precious stones such as jade is used. the choice of materials do affect the cost of the personal seal. Artistic impression on the body of seal. from blanks to simple engraving of philosophy quotes , and some went all out to have complicated sculptures carved on the body of the personal seal. Well, the cost will escalate accordingly too. Lastly, the calligraphy for the signage used in the personal seal.

Luckily, yours truly have access to FabLab@SP, an arsenal of digital fabrication machines to choose from. Designing and fabricating a personal seal is a breeze with the availability of machines, tools, software, and expertise.

equipment needed
1. 3D printers
1a. CNC milling machine
2. laser cutters

software needed
1. inkscape
2. tinkercad
3. cura

parts needed
1. stl file of the personal seal structure
2. dxf file of the caligraphy
3. basswood (balsawood is too soft; after several stamps, the engraving gave way)

the methodologies to digitally fabricate a personal seal:
1. download a model of choice from thingiverse as the body of the personal seal.
2. edit the model using simple cad modelling tools such as tinkercad. Here, a hallowed out base is created. This area hallowed out is to be inserted with the signage

3. send the edited STL file to be 3D printer. we have the stl file 3D printed using ultimaker2 at the highest resolution eg 20microns. Perform some final finishing moves such as acetone bath (if using ABS filament) or THF (if using PLA filament) on the 3D printed parts if desired.

3a. the STL file can be used for CNC milling too. more about that in a future post.

4. engrave the calligraphy on basswood with a laser cutter. several passes are needed to achieve atleast a 3mm deep engraving. note that there are 2 styles, the positive engraving (阳刻) on the surrounding of the calligraphy, and the negative engraving (阴刻) on the calligraphy itself.

5. insert the engraved basswood into the hallowed out spacer of the 3D printed part.

6. the final outcome

next up: cnc milling of the personal seal on aluminium!