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Topic: Bus Pirate "Ultra" v1a & v1b with ICE40 and Icestorm :) (Read 3419 times) previous topic - next topic

Re: Bus Pirate "Ultra" v1a & v1b with ICE40 and Icestorm :)

Reply #60
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Received 100 Bus Pirate cables using our pinout colors from DirtyPCBs.com custom cable service. The cables were just over $1 each for quantity 100.
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The primary reason we ordered these now is to get a feel for how the pinout color scheme works in practice before we commit to it permanently.
The leads are 30cm long, which seems a bit unwieldy in real life. The next version will be a few centimeters shorter.

The ends are terminated with 1 pin female "Dupont" connectors. These are easy to use with breakout boards and bread boards that have 2.54mm header pins. We'll need to choose a nice probe hook and mating crimp eventually.

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While the wire quality is fine, it's a bit stiff and unpleasant to work with. We're still looking for the perfect wire. The Saleae Logic cable has really amazing tangle free wire with great flexibility. We took the Saleae cable to a bunch of wire manufacturers in Shenzhen, but none of them had anything close in terms of quality and flexibility. They did confirm that it is not silicon coated wire, so our search will continue.
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Re: Bus Pirate "Ultra" v1a & v1b with ICE40 and Icestorm :)

Reply #61
I have bought these jumper cables [1] from AliExpress and they are super nice and flexible. They are advertised as being made from silicone wire.

[1]: https://aliexpress.com/item/32811041093.html

Re: Bus Pirate "Ultra" v1a & v1b with ICE40 and Icestorm :)

Reply #62
Very nice. If you bend the wire really hard does it leave a crimp in the wire? I bought various samples of silicone insulated wire from the market in Shenzhen, and while it is a big improvement over PVC wire, they are all kind of "floppy" and easily left with a permanent crimp when bent 180 degrees.

Someone also suggested we look at multimeter probe wire and suppliers, which has been pretty promising as well. According to a few probe datasheets I've read, the wire is double insulated with silicone in two different colors so bends and abrasions are readily apparent.

Overall it feels like we are getting closer :)
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Re: Bus Pirate "Ultra" v1a & v1b with ICE40 and Icestorm :)

Reply #63
Whether it leaves a kink in the wire depends on the radius of the bend. A radius greater than ~3 mm don't seem to do anything to the cable.

Besides the material of the insulation you also have to look out for wires with very fine strands. These tend to be much nicer and more flexible.