Hey I’m writing my first tutorial ūüôā

During my recent OLED testing¬†I wrote the software using Arduino Pro Mini 3.3 – the only Arduino board with 3.3V I/O (Lilipad may be the other one but not breadboard friendly). Originally I was using the SPI interface and everything works fine. But when I’m trying to test the I2C interface I suddenly realize the I2C lines are not on the breadboard pins! Instead they are on top of the board and I have to use jumper wires to connect them, not as neat as I would like ;p Continue reading

3D design of OLED test jig

During last (Chinese) year end shopping frenzy I grabbed some OLED display panels, hoping to boost the presentation¬†of my projects.¬†¬†The panel model is¬†UG-2864ASGGG14, made by “WiseChip Semiconductor Inc.” in Taiwan. Unlike typical LCD modules with complete interface board and 0.1 inch pitch pin headers, ¬†this is a bare panel comes with only the glass and flex PCB connectors.¬† Continue reading

Final PCB

During a recent shopping mania I grabbed some old AMOLED screens at very cheap price. The seller is an electronics hobbyist. He is kind enough to provide an adaptor board that generates required bias voltages for the screen. Unfortunately the board uses 2×12 DIL header, pain in the arse for breadboarding. I realize this is a perfect opportunity to test drive my MF70 CNC for PCB milling. So I quickly fire up Eagle and create a DIL to DIP adaptor. Continue reading

Finished LA/PWM box

In a recent project I need a 3.3V PWM signal generator. Initially I think the fastest ¬†way to do it is using an Arduino and write a simple program with analogWrite() function. But I’m too lazy to setup the breadboard… so I tried google.

Soon I come across a free software called “PWM Logic“.¬†Supposedly it will turn Saleae Logic Analyzer into a PWM generator. An original Saleae Logic is somewhat too steep for my pocket right now. But I do have a cheap Chinese clone lying aroung. So I hook it up. Not¬†surprisingly it does not work. Continue reading

Charger D ripple

Mobile charger has become one of the most popular accessories/consumables for smart-phone (thanks to Apple’s non-removable battery design). Being a heavy mobile internet user, I have accumulated several mobile chargers, ranging from top-of-the-line Energizer “Energi To Go”series, to homebrew single 18650 lithium battery¬†adaptor. All of them have proved to charge mobile phone well. But are they good enough to power testing circuits for lab use? I cannot have good confidence until I tear them apart and measure their performances. Continue reading

Finished relay board

I always admire those hobbyists having a machinery workshop in their garage. But living in Singapore government housing basically deprived me of any wild wishes of having my own. It is not until I found Proxxon Micro Mill MF70, I see a glimpse of hope. The reason I choose MF70 is not only because of its compact size and “reasonably” affordable price, but more importantly it being “CNC Ready”. I can imaging it would extremely useful for PCB prototyping and building cases or panels for my upcoming projects. Backed by the huge MF70 CNC community, I stated the quest for my first ever computerized machine.

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SMMF12 badge

Maker Faire to me was a¬†carnival¬†to enjoy on the web. Being mostly held in the US area, I’m simply denied the luxury of attending ¬†it. So when I received a news letter from sgbotic.com about their promotions during Singapore Mini Maker Faire 2012, I’m stunned.

It is a day to remember, 4th August 2012, that I attended the inaugural Singapore Mini Maker Faire 2012 (#SMMF12).
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Atten rework station AT8586

In Singapore where hobbyist are generally understood as Gundam models collectors or Tamiya cars racers, Sim Lim Tower is probably the only market place for electronics lovers. With four stories of retro-style retail shops which essentially selling the same vintage, it never fails to bring me back to the good old days. I sometimes do wonder how these shops survived. Maybe because of our curriculum for the final year project never changes since 1985, or our consumers are nostalgic by nature. But one thing for sure is that the shop owners are able to turn mediocrity into magnificence. When a LED light is selling at chocolate bar’s price, it is not too hard to understand how this market works. Continue reading