The eagle has landed…

…well, nearly. I finally figured out what I was doing wrong in eagle. Basically, the grid resolution is not the routing grid resolution and when I figured that out I was able to get the auto router to work. I think I’ve got a better handle on what I need to do to make circuit boards now so I’m planning to crack on with some more useful ones after I’ve got this first lot out of the way. I’m picking up the “reflow” oven on Saturday:

ebay £16, never been used

ebay £16, never been used

I’ll need to build a PID controller to control the temperature so I’ll start faffing with that at the weekend. My first circuit board is very simple, it’s just 5 RGB LEDs and associated resistors. Applying PWM to each ground will have to be done externally, this really is just a trial run. Here’s the schematic:

5led Schematic

5led Schematic

And here’s a picture of the board:

5led board layout

5led board layout

I don’t think it could get much simpler really. The leds will be driven using transistors from Arduino PWM pins, as long as the connections are right and I can solder the components on properly then it should “just work”TM.

I’ve used the SeeedStudio PCB service – it used to be (I think) $9.99 for 10 x 5x5cm 2-layer boards with free postage. It’s now $9.90 for 5 x 5x5cm 2-layer boards with postage extra. That’s still very cheap compared to everything else I’ve seen and comes in at just under £11.

It should be possible to solder one of these by hand (I’ve ordered the resistors and solder paste from RS – £3 for 500 x 0805 100R and £5 for 500 x 0805 150R. Solder paste is about £11.50 for 10cc, all of this is plus VAT and the usual £5 delivery charge. Have to start somewhere (I’d like to get the parts in fairly quickly) but I have seen reels of 5000 SMD resistors (0602, 0805 etc.) for around $8 with free postage on AliExpress!

Let’s see how the “reflow” oven pans out at the weekend, I can’t see that there are any difficulties but you never know…

 

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