Go to advanced search

by mestora70
Wed Nov 07, 2012 8:28 pm
Forum: Beginners
Topic: Static electricity bricked my Pi -- Options?
Replies: 13
Views: 4063

Re: Static electricity bricked my Pi -- Options?

FYI: It was in a case. I'm going to ground myself every time before touching the pi in the future.

Mike
by mestora70
Wed Nov 07, 2012 4:40 pm
Forum: Beginners
Topic: Static electricity bricked my Pi -- Options?
Replies: 13
Views: 4063

Re: Static electricity bricked my Pi -- Options?

I am running a second Pi with the same power supply.

I have not checked the composite video out but the activity light never comes on as it does on the other Pi moments after plugging in the power.

Mike
by mestora70
Tue Nov 06, 2012 8:11 am
Forum: Beginners
Topic: Static electricity bricked my Pi -- Options?
Replies: 13
Views: 4063

Re: Static electricity bricked my Pi -- Options?

This has nothing to do with condensation. It also has nothing to do with heat. It is quite pleasant right now, even a little chilly. A spark occurred between my hand and the Pi when inserting a SD card and not the Pi is dead.

Mike
by mestora70
Tue Nov 06, 2012 1:33 am
Forum: Beginners
Topic: Static electricity bricked my Pi -- Options?
Replies: 13
Views: 4063

Re: Static electricity bricked my Pi -- Options?

just to clarify I used badblocks -w on the sc card and it passed and I've since used the same sd card to install RaspBMC on another Pi. The static electricity definitely zapped my Pi.

Mike
by mestora70
Mon Nov 05, 2012 9:17 pm
Forum: Beginners
Topic: Static electricity bricked my Pi -- Options?
Replies: 13
Views: 4063

Re: Static electricity bricked my Pi -- Options?

Already did. It is dead.

Mike
by mestora70
Mon Nov 05, 2012 5:50 pm
Forum: Beginners
Topic: Static electricity bricked my Pi -- Options?
Replies: 13
Views: 4063

Static electricity bricked my Pi -- Options?

It is 18% relative humidity in Arizona this morning. I was manually changing some advanced settings on Raspbmc config files and when I went to plug my SD card back into my unpowered Pi, I felt a static electrical shock between my finder and the SD card slot. Now when power is applied, the only light...
by mestora70
Wed Aug 22, 2012 12:11 am
Forum: HATs and other add-ons
Topic: Is 3V3 GPIO HIGH voltage enough to fully turn on ULN2803a?
Replies: 7
Views: 4785

Re: Is 3V3 GPIO HIGH voltage enough to fully turn on ULN2803

Thanks Grumpy Mike. It looks like driving 8 160mA automotive relays (using the max saturation VCE--typical is better), gives 1.56W dissapation and a package temp 122C above ambient--just about the limit for this chip. Unless . . . http://letsmakerobots.com/files/imagecache/robot_fullpage_header/fiel...
by mestora70
Fri Aug 17, 2012 11:31 pm
Forum: C/C++
Topic: Wiring Pi in C performance question for Gordon (or anyone)
Replies: 17
Views: 4643

Re: Wiring Pi in C performance question for Gordon (or anyon

joan wrote:The pin mode change code (input/output/pwm) also calls the PUD 20 microsecond delay code.
If this is true, than what I was thinking of doing (to save a pin) is not worth it.

Mike
by mestora70
Fri Aug 17, 2012 11:27 pm
Forum: C/C++
Topic: Wiring Pi in C performance question for Gordon (or anyone)
Replies: 17
Views: 4643

Re: Wiring Pi in C performance question for Gordon (or anyon

Thanks Gordon and others. DexOS, not only have I researched that thread, my question about read/write state switching was partially inspired by that (as was my decision to use only C for shift register bit banging). I then asked about pull up/down as well to be complete. I'm looking into high speed ...
by mestora70
Fri Aug 17, 2012 5:25 am
Forum: C/C++
Topic: Wiring Pi in C performance question for Gordon (or anyone)
Replies: 17
Views: 4643

Wiring Pi in C performance question for Gordon (or anyone)

I've seen a few sites discussion turn HIGH and LOW times for GPIO using Wiring Pi from C but I have not seen anything about the time it takes to switch between read and write or pull-up and pull-down. Do you know the performance?

Mike
by mestora70
Wed Aug 15, 2012 10:56 pm
Forum: HATs and other add-ons
Topic: Is 3V3 GPIO HIGH voltage enough to fully turn on ULN2803a?
Replies: 7
Views: 4785

Is 3V3 GPIO HIGH voltage enough to fully turn on ULN2803a?

Looking at the datasheet for the uln2803 (Rev E) I see the following for Vi(on) on state input voltage Ic=200mA 2.4v Ic=250mA 2.7v Ic=300mA 3.0v Extrapolating, even if pulled up, it looks like the Gertboard can only be relied to switch about 350mA on the open collector driver, not the device rating ...

Go to advanced search