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Messages - t0mpr1c3

1
Tools of the trade / Re: Cheapest soldering station ever?!
Well, it turned out to be a perfectly serviceable no-name 936 with a skinny tip and a nicely balanced metal stand. It was appropriately earthed and fused, and even somewhere near calibrated. In short IT VERKS and for $11.90 including tax and shipping I'd say you could do worse. I would recommend it, for example, over a salad from sweetgreen.
4
Dirty Store / Re: Laser cut delrin?
I have reordered several times now and just want to say thanks for the great service! My most recent order was turned around in 3 days, which is just phenomenal.
6
Dirty Store / Re: Laser cut delrin?
I'm glad to say that the results were excellent, and I am about to reorder. The only issue was that I had to increase the width of some narrow slots slightly (see attached picture).
8
Dirty Store / Laser cut delrin?
I love me some 3mm clear acrylic, but is there any prospect of lasering up some Dirty Delrin? Pretty please!  :D
9
Project development, ideas, and suggestions / Re: Yet Another Protoboard for Pi Zero... MS4∏0
The prototypes arrived just now from Elecrow, and they look great. There is some tiny text on the boards and I am impressed how legible it is.

If anybody out there has some variety of Pi Zero and would like to test out a board, please contact me and I will put one in the post for you. Please indicate how soon you could get feedback to me about the board. Thanks!

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10
Project development, ideas, and suggestions / Yet Another Protoboard for Pi Zero... MS4∏0
Back in the OSHW fray after a longish hiatus, I snagged a Raspberry Pi Zero W in a 3/14 twitter comp (thanks @ZipCar) and set  about task 1: making a prototyping board for the initial experiments. I found several designs already out there. The one that I liked best was Adafruit's breadboard-style design with central power rails but it had one feature which I though rather weird. The positive power rail was split, supplying 5V on one half and 3.3V on the other. It seemed like a poor compromise.

I got to work rejigging the design with a 2-way solder bridge for a semi-permanent selection between 5V and 3.3V on the positive power rail. For greater flexibility, you can replace that with a 3x1 male header and jumper cap. That's it, basically. I couldn't find much else that I wanted to change.

Comments are more than welcome. I'll probably wang it over to OSH park so you can pick up the design from there, but for the time being it looks like this:
12
Project logs / Re: Nano fridge for solder paste
Better idea. An insulated food container would make a good, cheap, airtight box. Sandwich the Peltier between 2 heatsinks and mount one inside and one outside. 12V PC fan on the outside.

I read up on Peltier TECs here. It sounds like on/off control from a thermostat is likely to stress the Peltier unless the control cycle is really slow. Linear control is preferred. I will also have to restrict the current to 3A which is the limit of the 12V power supply I have available. So this will be a microcontroller thing. This project is a candidate from probably 10000 Arduino beer coolers out there.
14
Project logs / Re: Wireless sensor node with MSP430G2553/NRF24L01+
Here is Version 2 of the Magic Mote PCB. The tactile switch is more accessible at the side of the board, the programming/serial header is now IDC6 compatible, and there is improved isolation of the ground plane under the watch crystal.


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