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Topics - t0mpr1c3

3
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
4
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:
5
Project logs / Nano fridge for solder paste
I'm thinking a Tayda 125B aluminium enclosure, big enough for a couple of pots of Mechanic inside, with a Peltier TEC attached to the top of the lid under a heatsink. Some kind of temperature regulation running off the 12V that drives the Peltier. Perhaps just a comparator, thermistor, and a few passives: Velleman do a 12V thermostat kit (MK138). Spray foam to insulate, or just shove it in a shoebox with some packing peanuts.
6
Project logs / Proto Cape for BeagleBone
I spun a prototyping cape for the BeagleBone/Black.



The design is derived from the LGX Proto Cape created by Alexander Hiam for LGX / Logic Supply and released under Creative Commons Attribution 3.0 Unported License. I removed the SMD component footprints, which seemed superfluous to me, and cut back the "wings" on the side to make the cape shorter.

I have some spares listed on Tindie but have been known to trade PCBs or even give away the occasional freebie. PM me and tell me about your project :)

Blog post
Github repo
8
General discussion / Seeedstudio Fusion PCB coupon
I bought a $10 "leaf" coupon from Seeedstudio for PCB prototyping, but I seem to have had it a while.

Someone make me an offer. The actual coupon is just an alphanumeric code. Can't send the leaf by email :)
9
Project logs / Open source PID controller (DIY Arduino shield)
Program a temperature profile to mash beer or reflow solder. Here's how.

This full featured open source PID controller uses a DIY stripboard shield for Arduino Uno and compatible boards. Firmware based on osPID massively revamped and extended, blood was sweated over new auto tune routines. Standalone or remote operation over UART using Java GUI. All documented on Github with BOM, schematics, code, pictures etc. Parts cost about $15, external SSR module and Arduino required.



Hardware
Firmware
GUI
Thermocouple adapter
SSR module

I spun this project as a kit for Tayda, with the idea that all the components could be cheaply ordered in one place. It took a while to happen but the project is finally up on their site. Another way to go would be to adapt one of the very cheap LCD shields that are available.
10
Project development, ideas, and suggestions / Uranium glass wearable
Anyone into wearables here? I am planning a present for my sister that will feature some combination of UV leds, uranium glass buttons/beads, and surface mount MSP430 value range microcontrollers.

Lithium coin cells seem like the lightest and cheapest power option, I suppose rechargeable LiPo is longer lasting and more environmentally friendly but seems a bit heavy for a pendant (as opposed to a clip-on, which I think she would be less likely to wear).

If anyone has useful links I would appreciate it. I have checked out Adafruit a little bit but otherwise this is new territory for me.
12
Project logs / Wireless sensor node with MSP430G2553/NRF24L01+


I set out to design a wireless sensor PCB that could be inexpensively prototyped in quantities of 10. NRF24L01+ modules are exceedingly cheap (~$10 for 10), use very little power, and have sufficient range for most indoor projects. Low power MSP430 microcontrollers make an ideal partner for battery powered applications. I settled on the MSP430G2553, but the MSP430G2452 can be substituted whenever hardware UART is not required.

Read on

Github repo

I'm happy to donate a few pairs of these to the free PCB drawer.
13
Hardware biz / Tindie commission increase
I have a lot of goodwill for Emile at Tindie and his openness is to be commended but I have been very discouraged by the reasons behind the recent commission increase.

https://www.tindie.com/forum/topic/467/

Tindie seems to have scored a real hit with us makers, but it appears that to achieve the next round of VC funding will require a large step up in both volume and margin. I'm no businessman but I just don't see the strategy for the increase in scale.

I guess what I mean to say is, congrats to Ian for keep things small and nimble all these years.

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