yo holmes

Bob Pease is not just an electrical engineer

Sat, 20 Apr 2013 23:20:41 +1000

He is definitely also a magician

Photo

Tue, 05 Feb 2013 21:55:28 +1000

Linux Device Drivers, 3rd Edition (it's free!)

Sat, 27 Oct 2012 17:39:46 +1000

Linux Device Drivers, 3rd Edition (it's free!)

“Watch this. We are set. I’m gonna invert the Radon...

Tue, 23 Oct 2012 19:51:00 +1000

“Watch this. We are set. I’m gonna invert the Radon transform; it is un-f*&$ing believable.” @ 26:07

Gfhabentidnwbdhsyqvsnek

Tue, 23 Oct 2012 05:09:31 +1000

Gfhabentidnwbdhsyqvsnek

USB host on android

Wed, 17 Oct 2012 07:54:00 +1000

Attaching a broadcast receiver at runtime for the USB_DEVICE_ATTACHED event doesn’t work in 4.1.2. See here.

Intent filter method works but has a deadlock bug in the usb subsystem. Lovely.

ADS1118 problem solving

Wed, 17 Oct 2012 07:50:00 +1000

1. If you continuously update the configuration register and read it at the same time, the device will lock up.

2. Make sure you are using SPI with negative edge stable polarity

3. It takes about 3ms to switch the mux between channels; it will only switch after all of the pending conversions are complete

What is it? one of these.

Prior HK101 motorised microscope stage pinout

Thu, 02 Aug 2012 21:23:49 +1000

DB25 connector:

1 - first coil in x stepper, A+
2 - second coil in x stepper, B+
3 - limit switch 1 for x axis (NC)
4 - limit switch 2 for x axis (NC)
5 - first coil in y stepper, A+
6 - second coil in y stepper, B+
7 - limit switch common for y axis
14 - first coil in x stepper, A-
15 - second coil in x stepper, B-
16 - limit switch common for x axis
17 - first coil in y stepper, A-
18 - second coil in y stepper, B-
19 - limit switch 1 for y axis (NC)
20 - limit switch 2 for y axis (NC)

life complete

Sat, 28 Jul 2012 11:42:40 +1000

life complete

"Three weeks in the lab will save you a day in the library every time"

Tue, 24 Jul 2012 23:22:53 +1000

““Three weeks in the lab will save you a day in the library every time””

- R. Stanley Williams

NASA research on lead-free solder

Tue, 24 Jul 2012 23:12:00 +1000

NASA research on lead-free solder:

One interesting point: lead can only enter the body by inhalation (it boils at ~1700C) and by ingestion.

"Probes are vital to oscilloscope measurements. To understand how vital, disconnect the probes from..."

Sun, 15 Jul 2012 21:09:00 +1000

“Probes are vital to oscilloscope measurements. To understand how vital, disconnect the probes from an oscilloscope and try to make a measurement.”

- Tektronix Probe Fundamentals

"In this world, Elwood, you must be oh-so-smart or oh-so-pleasant. Well, for years I was smart. I..."

Thu, 12 Jul 2012 00:38:34 +1000

““In this world, Elwood, you must be oh-so-smart or oh-so-pleasant. Well, for years I was smart. I recommend pleasant.””

- From the play Harvey

Pandora is live in Australia!

Wed, 11 Jul 2012 09:52:37 +1000

Pandora is live in Australia!:

Been waiting a long, long time for this

South: schema migrations for Django

Tue, 10 Jul 2012 23:44:00 +1000

South: schema migrations for Django:

Pretty sure this should be built in, but I suppose they have their reasons.

Kids, remember to isolate your amplifier inputs, lest you blow...

Sat, 30 Jun 2012 01:50:00 +1000

Kids, remember to isolate your amplifier inputs, lest you blow up your expensive toys

Experimentin’ like crazy

Sat, 30 Jun 2012 01:48:54 +1000

Experimentin’ like crazy

The innocuous 'inline' keyword

Thu, 21 Jun 2012 09:56:44 +1000

The innocuous 'inline' keyword:

Some love it, some hate it. I personally think it is useful, but one must always be careful with these sorts of compiler features.

Xilinx and Digilent release a low cost Zynq kit

Tue, 19 Jun 2012 09:55:36 +1000

Xilinx and Digilent release a low cost Zynq kit:

Exciting stuff! The Zynq is a dual core ARM A8 merged with an FPGA. This is the way general purpose CPUs will go once we hit the point of diminishing returns for the number of cores.

Also, PetaLogix builds the Linux gear for it; UQ represent!

walter lives

Sun, 17 Jun 2012 14:51:00 +1000

walter lives:

hey overdetermined RLC equations, take this!