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by rickticktock
Sat Apr 06, 2019 3:53 pm
Forum: Other projects
Topic: Raspberry Pi into iMacG4
Replies: 2
Views: 424

Raspberry Pi into iMacG4

I say chaps,
I've got this iMac G4 (swan-neck thing you may recall) which I like the look of, but it's pretty useless these days.
Thought I might rip most of its guts out and put in a Pi!
Would have to interface HDMI to the screen.
Anyone ever try this?
TTFN
rickticktock
by rickticktock
Tue Mar 26, 2019 10:54 am
Forum: Python
Topic: GPIO hindered by print statements.
Replies: 8
Views: 359

Re: GPIO hindered by print statements.

I say chaps, Thank you all for your useful responses. The effect I'm getting is that pulses are forgotten altogether while printing is in process. I might try a small "sleep" after each "print". Absolute timing is not important here, the shifting in of data just advances by the shift_clock, then, af...
by rickticktock
Mon Mar 25, 2019 3:43 pm
Forum: Python
Topic: GPIO hindered by print statements.
Replies: 8
Views: 359

Re: GPIO hindered by print statements.

The indents didn't paste across for some reason.
by rickticktock
Mon Mar 25, 2019 3:40 pm
Forum: Python
Topic: GPIO hindered by print statements.
Replies: 8
Views: 359

GPIO hindered by print statements.

I say chaps, Here is a snippet of code: Note that I had print statements and a colourful display to help get this right, but they caused the problems. The printed result and the display said it was all working fine, but an oscilloscope on the GPIO pins told another story, of missed pulses. After I c...
by rickticktock
Thu Nov 01, 2018 12:56 pm
Forum: Mathematica
Topic: Mathematica and GPIO
Replies: 3
Views: 6470

Re: Mathematica and GPIO

Thanks both, for those answers.
by rickticktock
Thu Nov 01, 2018 12:03 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: RPi-3 - Power via GPIO
Replies: 14
Views: 17101

Re: RPi-3 - Power via GPIO

This is another case where a schematic would be useful. So far as I can tell, all the USB sockets, the +5 GPIO pins and the +5 power input are copper connected.
by rickticktock
Mon Oct 29, 2018 9:53 am
Forum: Mathematica
Topic: Mathematica and GPIO
Replies: 3
Views: 6470

Mathematica and GPIO

I say chaps, I've got a "real world, real time" situation, with sensors and things to control, which I can do with GPIO and, perhaps, Python to pull the strings, but some heavy maths (multi-variable optimisation) in between. Rather than spend a lot of time writing Python code, I thought I might pull...
by rickticktock
Wed Sep 26, 2018 9:09 am
Forum: Advanced users
Topic: Full schematic for the Pi3 and Zero
Replies: 43
Views: 38357

Re: Full schematic for the Pi3 and Zero

Hippy, I think you're right. None of the 4 SMPS outputs had any voltage. The DVM readings floated about at a few mV, implying open circuits. Also, it seems that order of bringing up the power rails is important so even connecting a bunch of bench power supplies won't do. I've binned it and ordered a...
by rickticktock
Tue Sep 25, 2018 8:44 pm
Forum: Advanced users
Topic: Full schematic for the Pi3 and Zero
Replies: 43
Views: 38357

Re: Full schematic for the Pi3 and Zero

I could prune the appropriate inductor on the output of the 3V3 regulator. First, I will check all the regulator outputs to see which, if any, still work.
by rickticktock
Tue Sep 25, 2018 4:47 pm
Forum: Advanced users
Topic: Full schematic for the Pi3 and Zero
Replies: 43
Views: 38357

Re: Full schematic for the Pi3 and Zero

Hi Dirk,
It didn't get at all hot, it just died. The MXL7704 quad power supply features over-current protection so I'm surprised it did not resurrect without the faulty breadboard connected.
TTFN
rickticktock
by rickticktock
Tue Sep 25, 2018 4:09 pm
Forum: Advanced users
Topic: Full schematic for the Pi3 and Zero
Replies: 43
Views: 38357

Re: Full schematic for the Pi3 and Zero

I've just bricked my Pi 3 B+ because of a short, 3.3 to GND, on a breadboard I had connected :( . I was wondering if pruning out a 3-terminal regulator and feeding 3.3V back in through the GPIO would work. Red LED lights, green doesn't. A schematic would be useful!
TTFN
rickticktock
by rickticktock
Wed Sep 12, 2018 2:31 pm
Forum: Troubleshooting
Topic: Installing bitstring
Replies: 4
Views: 492

Re: Installing bitstring

sudo pip3 install bitstring worked for me, thanks.
So why is there more than one version of Python in the NOOBS install? It just means that when I install some module it disappears into a pit of darkness. I should like to use 3.5.3, and delete earlier versions.
TTFN
by rickticktock
Mon Aug 20, 2018 10:55 am
Forum: Troubleshooting
Topic: Installing bitstring
Replies: 4
Views: 492

Installing bitstring

On my Pi at the command line I typed
pip install bitstring
then in the Python shell I typed
help ("modules")
but bitstring doesn't show in the list.
I tried on my W10 machine as well, same result. What to do?
TTFN

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