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by mahjongg
Wed May 23, 2018 12:44 am
Forum: Add-ons
Topic: 2,8mm wire cable to RPi pins
Replies: 3
Views: 99

Re: 2,8mm wire cable to RPi pins

considering the pin-pitch of the raspberry PI GPIO port is just 2.54mm I don't see how you could solder 2.8mm thick wires to them, without shorting multiple pins together (this is not a serious reply)....... :mrgreen: :mrgreen: :mrgreen: I would suggest you screw, or plug in, thinner wires to these ...
by mahjongg
Wed May 23, 2018 12:35 am
Forum: General discussion
Topic: 56k Modem with Raspberry Pi
Replies: 16
Views: 2298

Re: 56k Modem with Raspberry Pi

Winmodems are all plug-in cards (PC-bus cards), not external (boxed) modems. All (hayes compatible) external modems with a serial connector are modems that have a built in signal-processor, mostly with a Rockwell chip or something similar. Winmodems are crap, and use most of the CPU power just to do...
by mahjongg
Tue May 22, 2018 11:29 am
Forum: Graphics, sound and multimedia
Topic: Pi Zero PWM Audio through LM386 amplifier still very soft
Replies: 7
Views: 178

Re: Pi Zero PWM Audio through LM386 amplifier still very soft

The zero actually doesn't have any analog audio outputs, so I wonder what you did. Its possible to get audio output from a zero, but you have to accurately redirect one or both of the PWM engines to GPIO'(s) and you have to add your own filtering hardware. I suspect you omitted the latter. I can con...
by mahjongg
Mon May 21, 2018 12:28 pm
Forum: Troubleshooting
Topic: GPIO pins not responding to code
Replies: 3
Views: 91

Re: GPIO pins not responding to code

you seem to have plugged in the Tspine side of the band-cable connectors in reverse. the first few wires, (pin 1 and 2) carrying 3.3V, and 5V, now end off at the extreme left (opposite side) of where they should. look at the brown wire, (wire #1) on the PI it sits on the right hand side, (correctly)...
by mahjongg
Mon May 21, 2018 11:41 am
Forum: Beginners
Topic: where do I start?
Replies: 1
Views: 49

Re: where do I start?

by mahjongg
Sun May 20, 2018 7:45 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: BrightPi IR leds not working
Replies: 5
Views: 164

Re: BrightPi IR leds not working

use a multimeter to find the fault.
by mahjongg
Sun May 20, 2018 7:40 pm
Forum: Other projects
Topic: Yet Another PIC Programmer for the Raspberry Pi
Replies: 21
Views: 5745

Re: Yet Another PIC Programmer for the Raspberry Pi

I think that the numbers from 1 to 6 in the schematic are only to make some sort of order And the numbers in the chart above indicates the GPIO's Because if can I use a Pi or a PI 3 is easy to use the GPIO's numbers to indicate correct pins yes, that was my thought also, the numbering probably stem...
by mahjongg
Sun May 20, 2018 6:30 pm
Forum: General discussion
Topic: repair raspberry pi 3 b
Replies: 9
Views: 405

Re: repair raspberry pi 3 b

The mark is not important. The main thing is that the usb does not work wrong :!:, if the lightening symbol burns, your PI, and thus also your USB devices do NOT receive the at least 4.75V they need to operate , as the lightening symbol tells you that the 5V, at least temporarily, dips below 4.65V....
by mahjongg
Sun May 20, 2018 6:01 pm
Forum: Gaming
Topic: Overclock
Replies: 1
Views: 67

Re: Overclock

Overclocking was (sometimes) possible because the chips were not clocked to their maximum, due to production variations, if you were lucky, and had a sample with some headroom left you could get away with overclocking it. But since the production technology of raspberry PI SoC's has improved, and co...
by mahjongg
Sun May 20, 2018 5:46 pm
Forum: Troubleshooting
Topic: How to get rid of NOOBS
Replies: 5
Views: 73

Re: problem with booting from a "cloned" current raspbian system to a bus powered USB device

split off new posting, and its follow-ups, from a thread marked [solved].
and renamed the subject.

please don't re-open solved threads, as they are about a different subject when you re-address them.
by mahjongg
Sun May 20, 2018 1:00 pm
Forum: Troubleshooting
Topic: Pi 3 is Destroying SD Cards
Replies: 34
Views: 6795

Re: Pi 3 is Destroying SD Cards

if an SD card becomes very-very hot (enough so that its case cracks, due to steam build up inside them) then that means an electric defect (short circuit) has occurred inside that card. That is not something that you can get to happen with any kind of software, as no sd-card has a self-destruct inst...
by mahjongg
Sun May 20, 2018 12:38 pm
Forum: Advanced users
Topic: Pi 3 B+ fries if 3V3 rail is shorted to 5V
Replies: 19
Views: 520

Re: Pi 3 B+ fries if 3V3 rail is shorted to 5V

its all a learning experience, just as a TV repairman of old learned not to put his hand inside a working (CRT) TV, or (god forbid) throw a metal spanner in there, any electronic engineer worth his salary should know not to short two power supplies together. Yes, there could have been added electron...
by mahjongg
Sat May 19, 2018 1:40 pm
Forum: Troubleshooting
Topic: Noise from the board
Replies: 12
Views: 338

Re: Noise from the board

Its probably one of the coils of the switching power supplies, nothing special. Also ceramic capacitors can make sounds if you put large high frequency signals on them due to the piezo electric effect. nothing you can really do about it, but sometimes a drop of nail lacquer can silence a vibrating c...
by mahjongg
Sat May 19, 2018 11:27 am
Forum: Other projects
Topic: Yet Another PIC Programmer for the Raspberry Pi
Replies: 21
Views: 5745

Re: Yet Another PIC Programmer for the Raspberry Pi

For example in the little table chart says VPP control should be pin 9, which according to the Raspberry PI documentation has no connection, while according to the schematic GPIO numbers, VDD control for example is on pin 4 which again has no connection on the Raspberry GPIO. What are all those num...
by mahjongg
Sat May 19, 2018 11:22 am
Forum: Windows 10 for IoT
Topic: Window 10
Replies: 3
Views: 112

Re: Window 10

I expect he means running the development system to write code for win10IOT on the RPI.

I dont (want to) use it, so I cannot say if it will run better on windows8 than on windows10.
by mahjongg
Fri May 18, 2018 5:33 pm
Forum: General discussion
Topic: repair raspberry pi 3 b
Replies: 9
Views: 405

Re: repair raspberry pi 3 b

You have a problem booting the PI. I have used google translate to translate the boot problem sticky, please click on below link and read the translated sticky. شما مشکلی در بارگذاری PI دارید من از ترجمه گوگل برای ترجمه مشکل بوت چسبناک استفاده کردم، لطفا روی پیوند زیر کلیک کنید و چسبنده ترجمه را بخو...
by mahjongg
Thu May 17, 2018 4:37 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: how to connect to pins that are already used by a HAT?
Replies: 5
Views: 137

Re: how to connect to pins that are already used by a HAT?

Or Alex Eames Full_phat

Image

Or a dozen other solutions.

Like a band cable with multiple female isolation displacement connectors.
by mahjongg
Thu May 17, 2018 4:29 pm
Forum: B+ addons
Topic: How to detect what HAT is connected
Replies: 14
Views: 338

Re: How to detect what HAT is connected

Unfortunately not everything that is sold as a HAT is really a HAT.

For example I foresee a bit of an issue with the "POE HAT", which IMHO should not be designed to block all GPIO's, and should be able to do its job in a combination with a HAT, meaning they cannot both be HAT's.
by mahjongg
Thu May 17, 2018 4:19 pm
Forum: B+ addons
Topic: How to detect what HAT is connected
Replies: 14
Views: 338

Re: How to detect what HAT is connected

The HAT's use a private I2C channel, not the main I2C channel, or the I2C channel used by HDMI. I think that to read the EEPROM yourself it would require quite some software trickery. I think the kernel now "owns" the I2C port used for reading the EEPROM in the HAT. Sorry, I'm not familiar with how ...
by mahjongg
Thu May 17, 2018 4:02 pm
Forum: B+ addons
Topic: How to detect what HAT is connected
Replies: 14
Views: 338

Re: How to detect what HAT is connected

All HAT's have an EEPROM which is read, and used to configure the device tree automatically. This mechanism was added to Raspbian with the launch of HAT's, and has never changed AFAIK. I only found *this* issue: https://www.raspberrypi.org/forums/viewtopic.php?t=206944 A thread about the launch of s...
by mahjongg
Thu May 17, 2018 10:37 am
Forum: Troubleshooting
Topic: All pins fried, don't know why
Replies: 24
Views: 543

Re: All pins fried, don't know why

The serial protocol requires the lines to be driven by an open-collector output - high is open-circuit, low is pull-down to gnd. At one end of the line (probably the rx end) there should be a pull-up resistor. I am not convinced that is the case; that 3V3 UART serial protocol is an open-collector s...
by mahjongg
Wed May 16, 2018 5:56 pm
Forum: Beginners
Topic: wiring a mouse to Rpi to emulate click
Replies: 3
Views: 123

Re: wiring a mouse to Rpi to emulate click

I doubt such an example exists, if it does it probably doesn't use the same mouse you have. So use your noggin, you can do it! I would use an opto isolator, (4N35 or similar) start by lighting the LED inside it up permanently, so the photo transistor conducts, and then wire the photo-transistor acro...
by mahjongg
Wed May 16, 2018 4:24 pm
Forum: Troubleshooting
Topic: All pins fried, don't know why
Replies: 24
Views: 543

Re: All pins fried, don't know why

If all the GPIO's are "fried", (that is they are all defective due to some external damaging force) then they would all get very hot, and you would definitely notice that the SoC would get too hot to touch. I know of no situations with any "fried" GPIO's where that was not the case. its very difficu...
by mahjongg
Wed May 16, 2018 4:13 pm
Forum: Raspbian
Topic: Under-voltage detected! (0x00050005) ... how to disable?
Replies: 70
Views: 7608

Re: Under-voltage detected! (0x00050005) ... how to disable?

I would hope that customer facing devices would never ever have this happen anyway. I would also expect that customer facing devices will be likely to have some sort of custom software on them, and that customisation could include modification to this functionality if it really is a problem (for ex...
by mahjongg
Wed May 16, 2018 11:04 am
Forum: Nederlands
Topic: raspberry pi 3 start niet meer op.
Replies: 1
Views: 74

Re: raspberry pi 3 start niet meer op.

Lees de boot problem sticky thread in "troubleshooting". Als je engels niet goed genoeg is, vertaal dan de thread met google translate.

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