Go to advanced search

by pksato
Sat Jun 25, 2016 1:22 pm
Forum: Beginners
Topic: Coding to the Pi's audio jack
Replies: 4
Views: 1111

Re: Coding to the Pi's audio jack

But, Raspberry Pi 2 and 3, A+ and B+ models, have a 4 section jack, know as TRRS (Tip, Ring, Ring, Sleeve). Signal of TRRS is Left, Right, Ground and Video. If use three section plug, Ground contact can not done and get noise on audio. Or can short circuit Video and Ground. Need some kind of adapte...
by pksato
Sat Jun 25, 2016 1:03 pm
Forum: Beginners
Topic: Preventing Damage to the PI
Replies: 9
Views: 1370

Re: Preventing Damage to the PI

Hi, Ask for led circuit, but show a switch circuity? Need answer to led or switch circuity? If is about led: Some blue and white led not work with 3.3V. Red and green are fine to use with 3.3V. Current limiter series resistor is calculated using Ohms law. For that need to know led drop (forward) vol...
by pksato
Fri Jun 24, 2016 7:35 pm
Forum: Beginners
Topic: Coding to the Pi's audio jack
Replies: 4
Views: 1111

Re: Coding to the Pi's audio jack

Hi, except Raspberry Pi Zero and Computer module. All other have audio output on 3.5mm jack. But, Raspberry Pi 2 and 3, A+ and B+ models, have a 4 section jack, know as TRRS (Tip, Ring, Ring, Sleeve). Signal of TRRS is Left, Right, Ground and Video. If use three section plug, Ground contact can not ...
by pksato
Fri Jun 17, 2016 2:35 pm
Forum: General discussion
Topic: how to track a stolen pi?
Replies: 21
Views: 4025

Re: how to track a stolen pi?

Hi, Prevent before leave using RFID. Like used on library. But, this can be cost a lot. Using ISM band RF modules. 433MHz TX module, is cheap (ebay $3), and can used to prevent and track. But, need to be powered. Little battery (rechargeable) or super capacitor can provide power to the module, and w...
by pksato
Thu Jun 16, 2016 2:34 pm
Forum: Beginners
Topic: Connecting a 5v IR transciever to a RPi model B
Replies: 24
Views: 2744

Re: Connecting a 5v IR transciever to a RPi model B

Hi, Level converter discussion again? :D One direction passive shift down converter works from 0Hz to few GHz, with nice rise and fall times. As example, attenuated oscilloscope probe are passive. But, for best bandwidth, need to add a capacitor in parallel with high side resistor. It is a compensat...
by pksato
Thu Jun 16, 2016 2:07 pm
Forum: Português
Topic: Cabo HDMI para VGA
Replies: 6
Views: 2069

Re: Cabo HDMI para VGA

Ola,
Precisa de um conversor ativo de HDMI para VGA, como esse:
https://www.walmart.com.br/cabo-convers ... 4115215/pr

Um cabo (ou bloco adaptador) que tem HDMI em uma ponta e VGA em outra não ira funcionar.
O raspberry PI não possui sinal VGA na saída HDMI.
by pksato
Wed Jun 15, 2016 8:32 pm
Forum: General discussion
Topic: Capacitor types used on Pi 3
Replies: 18
Views: 3859

Re: Capacitor types used on Pi 3

Hi,
If have marking on capacitor (not on pcb) it can be a aluminum or tantrum electrolytic, and is polarized.
If not have marking, is a multilayer ceramic.
by pksato
Wed Jun 01, 2016 11:21 am
Forum: Beginners
Topic: Windows go off screen
Replies: 8
Views: 5004

Re: Windows go off screen

Hi,
Configure framebuffer size to one more big that of TV (640x480), using these parameters on config.txt

Code: Select all

# Uncomment to force a console size. By default it will be display's size minus overscan.
framebuffer_width=800
framebuffer_height=600
by pksato
Tue May 31, 2016 8:31 pm
Forum: General discussion
Topic: need some help.
Replies: 11
Views: 1306

Re: need some help.

The same happens to me the other day.
But, I had some bad experiences in the past, and, before Submit, I copy the text to gedit.
Default inactive session time is very short (30min?). I don't see option to change it.
And, don't have auto draft save.
Addon/plugin to salve for us.
by pksato
Tue May 31, 2016 12:35 pm
Forum: Português
Topic: RPI 3 Conecta mas não navega
Replies: 7
Views: 3698

Re: RPI 3 Conecta mas não navega

Ola, Já fiz isso mas continua sem navegar, consigo pingar no roteador e acessar a pagina de configuração dele, até tirei um print da tela, como vc pode ver o MAC do raspberry está constando na pagina de configuração do roteador com o IP 192.168.1.10 Imagem: http://www.4shared.com/photo/OGZhvBbsce/Co...
by pksato
Mon May 30, 2016 4:56 pm
Forum: General discussion
Topic: GPIO Pins Not Working
Replies: 6
Views: 1001

Re: GPIO Pins Not Working

To clarify: If do it on you code, GPIO.output(GPIO_IN_USE, GPIO.LOW) The correspondent physical pin now go to low (0V)? And, on some place of you code, have GPIO.output(GPIO_IN_USE, GPIO.HIGH) To set physical to high (3v3), Right? Some pins have a pull-up resistor (always high), used by i2c and othe...
by pksato
Mon May 30, 2016 1:37 pm
Forum: Beginners
Topic: Closing a circuit using 12 volt relay
Replies: 13
Views: 2069

Re: Closing a circuit using 12 volt relay

Hi, This module is not same as very popular sainsmart and clones. And photo on datasheet and pinout description not match. Before connect this relay board to raspberry pi, make some testing experiments. Yon need: 3V battery (two AA or AAA); 5V PSU; 12V PSU; Some indicating device (light bulb, led) t...
by pksato
Sat May 28, 2016 2:30 pm
Forum: Beginners
Topic: Help on pointing my IP to a free domain name
Replies: 7
Views: 1406

Re: Help on pointing my IP to a free domain name

I use noip.com to provide a hostname to my dynamic and static IPs.
No-ip or other dynamic dns services. Some are paid. No-ip still free, but have limitations, and need to confirm every month.
by pksato
Sat May 28, 2016 2:21 pm
Forum: Beginners
Topic: Printing Emails?
Replies: 3
Views: 733

Re: Printing Emails?

Hi, Is not clear for me. You contact form send email to some account? (Hosted on some ISP). Or you contact form run on raspberry pi on you office? But, printing email not make sense for me. Having printer configured and working (see about cups). From email, need to use fetchmail to get email from se...
by pksato
Sat May 28, 2016 12:49 pm
Forum: Beginners
Topic: VFD Tube & Raspberry PI
Replies: 1
Views: 943

Re: VFD Tube & Raspberry PI

Hi, VFD is not easy to drive. But not so difficult. VFD is a thermionic vacuum tube. Main parts of VFD are: The filaments, Cathode (shared with filament, -v), Anode or segments (+v), Grid or control (+v). Filament voltage and Anode to Cathode voltage need to get from datasheet. But, filament voltage...
by pksato
Sat May 28, 2016 12:08 pm
Forum: General discussion
Topic: First time poster! Multiple questions
Replies: 29
Views: 3955

Re: First time poster! Multiple questions

Hi, A color sensor (search on ebay,TCS3200) can be used to detect the beads color. More easy to use that a camera, no need to lean computer vision (openCV). Or nor so easy, TCS3200 convert color (light) intensity to frequency, and RPi is not good to measure frequency with precision. Arduinos can do ...
by pksato
Fri May 27, 2016 5:28 pm
Forum: General discussion
Topic: 56k USB modem
Replies: 7
Views: 1716

Re: 56k USB modem

Hi,
Is possible to implement a caller id in software, using sound card and some type of interface to phone line.
And, have caller id chip like EM92547BP (for fsck).
Another chip MT8843.
Modding a caller id device http://www.raphnet.net/electronique/cid/cid_en.php
by pksato
Tue May 24, 2016 12:47 pm
Forum: General discussion
Topic: raspberry pi controlled li-ion battery charger
Replies: 7
Views: 2509

Re: raspberry pi controlled li-ion battery charger

Hi,
If is a single cell, use TP4056 module. Cost less that US$1,00 on ebay.
Not have bus to connect to raspberry pi, but two led output can easy connect to RPi.
Some of these modules are pins to output, other no.
by pksato
Tue May 24, 2016 1:14 am
Forum: Beginners
Topic: Arduino + Raspberry Pi connection through 3.3 and relay?
Replies: 10
Views: 2384

Re: Arduino + Raspberry Pi connection through 3.3 and relay?

Why make simple things more complex? To connect a 5V arduino output to raspberry pi input, use a voltage divider. Two resistors, cost only few cents. And, is bidirectional. To connect raspberry pi to 5V arduino, use direct connection. Arduino read high if input voltage are great than 3V. Voltage div...
by pksato
Tue May 10, 2016 8:32 pm
Forum: Português
Topic: Duvidas fonte para raspberry pi 3
Replies: 12
Views: 4934

Re: Duvidas fonte para raspberry pi 3

a minha fonte foi comprada no aliexpress junto com um kit de refrigeração, o vendedor disse que ele tem 5V 2A essa fonte colocara em risco o meu pi3? http://pt.aliexpress.com/item/2016-Wholesale-Hot-sale-Raspberry-pi-3-Acrylic-Case-Heat-Sink-Cooling-Fan-Power-Adapter-Supply/32658775099.html A princ...
by pksato
Tue May 10, 2016 8:28 pm
Forum: Português
Topic: Como desligar corretamente o Raspberry Pi3
Replies: 11
Views: 13254

Re: Como desligar corretamente o Raspberry Pi3

Pode puxar a fonte direto da tomada. Isso não vai danificar o raspberry pi. Para ligar também pode plugar direto na tomada. Muitos aparelhos não possuem botão liga/desliga. Como os roteadores. Mas, siga esse procedimento para ligar: Instale o cartão SD; Conecte o cabo no raspbeerry Pi; Conecte o cab...
by pksato
Tue May 10, 2016 8:17 pm
Forum: Português
Topic: Duvidas fonte para raspberry pi 3
Replies: 12
Views: 4934

Re: Duvidas fonte para raspberry pi 3

Ola, Se a fonte tem a especificação de 5V e qualquer potência, expressa em Amperes (A), acima de 1.25A e adequada para o uso com o Raspberry Pi (todos os modelos). O que ocorre e a qualidade de fabricação da fonte, muitas fontes possuem uma eletrônica muito simples, não mantendo a tensão dentro dos ...
by pksato
Tue May 10, 2016 2:24 pm
Forum: Beginners
Topic: Wifi country code
Replies: 13
Views: 10903

Re: Wifi country code

Hi, some kernel module not enable channels 12, 13 and 14, even with correct country code. If wifi chipset have support to these channels, on some kernel modules need to enable it on compile time. I don't know if is case of brcmfmac. To change regulatory domain, one of these commands can be used COUN...
by pksato
Wed May 04, 2016 1:43 pm
Forum: Beginners
Topic: Mp3 Player radio
Replies: 14
Views: 2142

Re: Mp3 Player

Hi, mp3 from file or from internet or local network? If is only from file (sd card), buy one of these mp3 module. Are cheap as rpi zero. Raspberry Pi need to load a operational system, and it take some time. A full OS take long time to load. But, is possible to build some with minimal needs to play ...
by pksato
Tue May 03, 2016 8:31 pm
Forum: Beginners
Topic: Help with spreadsheet
Replies: 3
Views: 1016

Re: Help with spreadsheet

Hi, I think, you looking for database manager system. sqlite is very popular on stand alone (not so) simple application. For more complex, or not, project, mariaDB, postgresql, etc. Basic flow chart is: Read barcode, Check if is on database (DB), if not, write and blink green led, if is on DB, blink...

Go to advanced search