Bob Pease is not just an electrical engineer

He is definitely also a magician

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

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

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USB host on android

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

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

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

“Three weeks in the lab will save you a day in the library every time”
R. Stanley Williams