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by pbrwr
Sat Nov 28, 2015 8:59 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Rs232 to TTL with handshaking
Replies: 4
Views: 1177

Re: Rs232 to TTL with handshaking

rs-232 can use various options for flow control. Your best bet is to use a USB to RS-232 converter that implements all signals (some el cheapo ones don't). Also make sure it creates the correct signal levels, as some really bad ones use signal levels that are actually too low (worst I've seen is 0 t...
by pbrwr
Thu May 07, 2015 6:33 pm
Forum: Windows 10 for IoT
Topic: DHT22/AM2302
Replies: 9
Views: 3255

Re: DHT22/AM2302

I'm working on a wrapper class for that sensor. When it's done i'll post a link to it. It can take a while, as I first have force a display into submission.
by pbrwr
Mon May 04, 2015 1:06 pm
Forum: Windows 10 for IoT
Topic: keyboard won't work!
Replies: 6
Views: 1468

Re: keyboard won't work!

Make sure you use a wired keyboard, wireless ones don't work appearently.
by pbrwr
Tue Mar 03, 2015 1:28 pm
Forum: Troubleshooting
Topic: Relay 12v doesn't works(but led does)
Replies: 3
Views: 428

Re: Relay 12v doesn't works(but led does)

Hi, Unfortunately, the amazon description is as clear as mud. But if my chinglish serves me well, the board uses opto-couplers to drive the relays. It also mentions 5 mA. I'm not sure if the Pi can deliver enough current to the opto-couplers to make them work properly. This depends on how this is al...
by pbrwr
Fri Jun 20, 2014 8:15 am
Forum: Nederlands
Topic: thightvnc streamt geen video
Replies: 1
Views: 492

Re: thightvnc streamt geen video

Het afspelen van video op een RPi gebeurd door een hardware decoder in de GPU. Deze "plakt" het videobeeld over wat er al weer werd gegeven, en stuurt dit rechtstreeks naar de video uitgang. Dit videobeeld heeft geen eigen venster, en kan dus ook niet door VNC worden doorgegeven. Je kunt proberen ee...
by pbrwr
Sun Oct 06, 2013 12:45 pm
Forum: Troubleshooting
Topic: Cannot SSH over WiFi
Replies: 4
Views: 630

Re: Cannot SSH over WiFi

Does your WiFi use client isolation? If it does, switch it off in your access-point. It is a commonly found feature that prevents connected computers from accessing each other. A good security feature on a public network, a bit of an annoyance on a home network.

Pieter
by pbrwr
Fri Oct 04, 2013 11:56 am
Forum: Troubleshooting
Topic: DNS problem
Replies: 1
Views: 321

Re: DNS problem

can you ping the nameservers?

also
I've set up arch to share the internet connection and configured iptables
How did you do this, and how did you set up iptables? As far as I know you need two network connections for this, and my Pi has only one.
by pbrwr
Fri Oct 04, 2013 11:53 am
Forum: Troubleshooting
Topic: Setting up Headless Raspberry Pi - Startup DHCPREQUEST
Replies: 4
Views: 955

Re: Setting up Headless Raspberry Pi - Startup DHCPREQUEST

Hi, DHCP uses some time constraints in negotiating an IP address. Loosening them on your end of the line probably won't help much if the other end doesn't change its settings. 5 seconds should be more than adequate for a DHCP negotiation. Only a few broadcast packets are sent both ways. Either your ...
by pbrwr
Fri Oct 04, 2013 11:28 am
Forum: Troubleshooting
Topic: Sticky Keyboard Issue / Keys skipping
Replies: 11
Views: 3996

Re: Sticky Keyboard Issue / Keys skipping

I've found that the problem mostly dissappears if I use a powered USB hub. The keyboard shoud work off the Pi's USB port, it doesn't use a lot of power (a few milli amps). It could be an interference problem, as the USB driver chip sits right behind the USB port, without any shielding. I'll try if a...
by pbrwr
Sun Sep 08, 2013 4:21 pm
Forum: Automation, sensing and robotics
Topic: Reading a 9-32 volt analogue signal
Replies: 9
Views: 1958

Re: Reading a 9-32 volt analogue signal

You can use a current sensor, or use a resistor to convert current to voltage. If you use a resistor, make sure it's accurate (low tolerance) and is well overrated (don't use 0.25 W resitors). There are also more elaborate/rugged/safe/expensive solutions, if you have an industrial application.
by pbrwr
Wed Aug 28, 2013 7:00 pm
Forum: Advanced users
Topic: SSH through a serial converter
Replies: 3
Views: 1923

Re: SSH through a serial converter

You will need pppd to get a network connection on your pi over the modem. You can look at this page for more details on how to do that: http://www.aboutdebian.com/modems.htm You also need a dail-in or gprs account. But ssh is one step further. A lot of mobile networks do not offer a direct connectio...
by pbrwr
Sun Aug 25, 2013 11:18 am
Forum: Troubleshooting
Topic: wiringPi
Replies: 8
Views: 1098

Re: wiringPi

Hi,

Try to connect it like this:
rpi-gpio-led.png
Gpio led
rpi-gpio-led.png (26.89 KiB) Viewed 1067 times
All should work as intended.

Pieter
by pbrwr
Fri Aug 23, 2013 6:56 pm
Forum: Troubleshooting
Topic: mounting external hard drive USB 3.0
Replies: 7
Views: 31946

Re: mounting external hard drive USB 3.0

It could very well be a power issue, USB 3.0 has a higher current rating than USB 2. I've had two USB 3 devices that wouldn't properly connect to a USB 2 hub, because they did not report their power rating properly. See if you can use the drive on a USB 2 port on a PC or Laptop. That should rule out...
by pbrwr
Fri Aug 23, 2013 8:57 am
Forum: Troubleshooting
Topic: Adafruit_DHT Error
Replies: 3
Views: 1118

Re: Adafruit_DHT Error

Yes, or just type

Code: Select all

make
, since there is a makefile provided
by pbrwr
Thu Aug 22, 2013 5:59 pm
Forum: Troubleshooting
Topic: Adafruit_DHT Error
Replies: 3
Views: 1118

Re: Adafruit_DHT Error

You need to recompile the .c files again using make (just type make on the command line). This way the executable will work again.

Pieter
by pbrwr
Sat Aug 17, 2013 1:19 pm
Forum: Bare metal, Assembly language
Topic: 68000 Assembly Language Suggestions
Replies: 20
Views: 5212

Re: 68000 Assembly Language Suggestions

I agree that it is a better thing to start with learning ARM on a Pi (or similar), it's much easier, more affordable, better supported, more futureproof, etc.. While the 68k is a CISC, the coldfire is a RISC architecture (according to motorola / freescale). Given the size and complexity of the instr...
by pbrwr
Fri Aug 16, 2013 7:03 pm
Forum: Bare metal, Assembly language
Topic: 68000 Assembly Language Suggestions
Replies: 20
Views: 5212

Re: 68000 Assembly Language Suggestions

Coldfireboards ususally come with a microcontroller on it (smd). The one i've used only had a serial connection as a user interface. Some had a network connection, but no code to make it do something. If you wanted more than that, you'd have to make it yourself and make it work yourself. Compared to...
by pbrwr
Fri Aug 16, 2013 1:03 pm
Forum: Bare metal, Assembly language
Topic: 68000 Assembly Language Suggestions
Replies: 20
Views: 5212

Re: 68000 Assembly Language Suggestions

Hi, the 68k is a good processor to learn bare metal programming, but a board will be very difficult to get hold off. If you are up to it: you can make one yourself, since it will be all through hole components. It might even work on a (very large) breadboard. If you are using the book I think you ar...
by pbrwr
Thu Aug 15, 2013 9:51 pm
Forum: Nederlands
Topic: raspberry pi als media player
Replies: 7
Views: 4998

Re: raspberry pi als media player

Bluraymenu's gebruiken Java, en dat gaat niet altijd even soepel op een RaspberryPi. Daarnaast is bluray afspelen via een usb HD een beetje een uitdaging voor een Raspberry Pi, hij heeft er denk ik niet de doorvoersnelheid voor, de USB-aansluiting van de Raspberry Pi is niet de allersnelste. De verg...
by pbrwr
Thu Aug 15, 2013 9:30 pm
Forum: Nederlands
Topic: naam@mijndomein.nl
Replies: 7
Views: 1318

Re: naam@mijndomein.nl

Een emailserver voor een domein installeren is iets ingewikkelder dan alleen een programma installeren. Zeker als je van plan bent om de server daadwerkelijk op het internet aan te sluiten. Voordat je verder gaat lijkt het mij verstandig om ervoor te zorgen dat je weet hoe emailservers werken, en ho...
by pbrwr
Fri Jul 05, 2013 10:46 am
Forum: General discussion
Topic: Minimum peripherals to run a PI
Replies: 6
Views: 767

Re: Minimum peripherals to run a PI

Keep in mind the Pi has no internal clock. If you want to make things happen at a specific time (let's say at 3 pm), you also need a network connection, so the Pi can sync it's timekeeping to an external timesource.

Pieter
by pbrwr
Fri Jul 05, 2013 10:42 am
Forum: General discussion
Topic: Composite vs HDMI to VGA to SCART
Replies: 2
Views: 805

Re: Composite vs HDMI to VGA to SCART

This scheme *may* not work (depends on TV and SCART cable used), also I don't think the improvement is worth the effort, it's not going to be a huge improvement. You most likely need a powered USB-Hub to power the converter, USB power from the Pi itself is very limited. The converter is usefull if y...

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