Some days ago, I suddenly want to make a microcontoller downloader with printed circuit board. I want to explore my interest about microcontroller I've studied some years ago. Because of my concentration was mechanical and machinery design, microcontroller just be a little part of my whole study. I was only learning the microcontroller basic logic and the simple programming language to be downloaded to the chips, not the detail of electronics devices for making implementation.
To begin my project, I made a plan for myself.
That was my plan:
1. Making a power supply unit:
- Learning.
- Analysing schematic circuit; made by other source.
- Ordering components.
- Designing Power Supply Unit Layout.
- Designing PCB layout.
- Making PCB.
- Soldering components.
- Finishing, troubleshooting.
2. Making Microcontroller Development Board.
- Learning.
- Analysing schematic circuit of downloader unit.
- Ordering components.
- Designing Microcontroller Development Board Layout.
- Designing PCB Layout.
- Making PCB.
- Soldering components.
- FInishing, troubleshooting.
- Testing with simple microcontroller project.
3. Implementing Any Microcontroller Projects.
Pending until succesfully finishing microcontroller development board.
My current condition.
When I first write this article, I was currently on last Stage 1 point 7, and wait for some components I order from
www.digi-ware.com. Now I'm just finished Power supply unit. It's working, though the performance is prety ugly. :P.
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| Power Supply Unit with 2 Output, 1.7-25V each |
Flash Back: Making PCB layout
I opened google
search engine and just searched adjustable power supply unit or whatever similiar to that. For the result, I found this diagram:
Then suddenly I want my power supply will have two adjustable output, so I modify that diagram by making branch after positive output from diodes bridge, and copying the rest circuits. I made sketch of PCB layout, then design it with CATIA in 2D drafting mode. I printed on glossy photo paper, and become like this:
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| PCB layout on glossy photo paper |
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Preparing Plain PCB
I measured the PCB, marked on it, and then cut it.
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| Dirty plain PCB |
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It's very rough, so I clean it with foam while polishing with abrasive sponge. Look the differences.
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| Polished plain PCB |
I prepared the iron with ironing pad and made preheat that clean plain PCB.
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| Ironing Preparation |
The hot plain PCB will gladly accept the glosy photo paper with ink on it. I pressed my iron on them to make the ink melt and stick on the copper surface.
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| After Ironing |
And then remove the papper carefully after the temperature became realy cooling down. I did it.
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| Result of Ironing |
That's my 2nd trial and was still unperfect. For countermeasure, I try to cover the unwanted opened copper surface with permanent marker.
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| Covering Mistakes |
Start Etching
It's time to do etching process, so I prepare the Ferric Chloride Powder.
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| Ferric Chloride |
Pouring 1,5 glass of warm water into that powder was a nice experience. They're reacting (so what? LOL :D).
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| Etching Preparation |
I just put the PCB directly into the ferric chloride. Because I use new ferric chloride, etching process was very fast. It's just about 5 minutes. Shaking the PCB with twin stick make the process better.
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| Etching Process |
Clean them with clear water will finish the etching process.
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| Gotcha!! |
Making Holes for The Components
I bought mini hand drill
that could handled 1 & 2 mm diameter twisted drill. The power source of the hand drill is 12 DC-Volt, and my DC power supply unit was currently in making progress. Finaly I use my notebook charger. It's 19 DC-Volt, so my drill turning fast.
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| ASUS Notebook Charger as Temporary Power Suply |
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