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by stevech
Wed Jun 15, 2016 3:30 am
Forum: Advanced users
Topic: 2560x1600 resolution
Replies: 10
Views: 5362

Re: 2560x1600 resolution

I'll guess that the monitor can't do that resolution with HDMI. Rather than display port,
by stevech
Wed Jun 01, 2016 11:37 pm
Forum: General discussion
Topic: 2 New Pi Articles in Tech Republic
Replies: 2
Views: 745

Re: 2 New Pi Articles in Tech Republic

Author is regurgitating old news, wrong vendor names.
by stevech
Wed Jun 01, 2016 7:27 pm
Forum: Python
Topic: Using pySerial
Replies: 3
Views: 919

Re: Using pySerial

no such problem here. Be sure to disable hardware flow control. And change the OS config to not have a login terminal on that serial port.
by stevech
Wed Jun 01, 2016 4:40 pm
Forum: General discussion
Topic: TeamViewer IoT Developer Contest: Win up to EUR 5,000
Replies: 40
Views: 26535

Re: TeamViewer IoT Developer Contest: Win up to EUR 5,000

Needs more developer testing / debugging? Including missing installation script (.deb doesn't have dependencies in it).
by stevech
Wed Jun 01, 2016 12:37 am
Forum: General discussion
Topic: TeamViewer IoT Developer Contest: Win up to EUR 5,000
Replies: 40
Views: 26535

Re: TeamViewer IoT Developer Contest: Win up to EUR 5,000

I'm using jessie on RPi2. When I tried to install this preview Teamviewer, there are many dependencies not met. I've not been able to find installation instructions. sudo dpkg -i RPi\ teamviewer-host_11.0.58397_armhf.deb Selecting previously unselected package teamviewer-host. (Reading database ... ...
by stevech
Fri May 06, 2016 3:40 am
Forum: General discussion
Topic: VNC Server on RPi 2 B+
Replies: 7
Views: 1439

Re: VNC Server on RPi 2 B+

I use VNC client on windows 7 and VNC server on RPI2s and RPi zeros.
I just searched out and followed instructions for setting this up, with a keyboard/mouse and monitor connected to the RPi. Once VNC works, I use them headless on the LAN, and the Zero, on WiFi, with VNC.
by stevech
Sat Apr 30, 2016 12:28 am
Forum: General discussion
Topic: Best place to buy Pi & parts in US
Replies: 15
Views: 3788

Re: Best place to buy Pi & parts in US

Adafruit is a good outfit.
And they have that New York attitude :o
by stevech
Sun Apr 10, 2016 8:23 pm
Forum: Advanced users
Topic: PI3 microSD and wear leveling
Replies: 33
Views: 29550

Re: PI3 microSD and wear leveling

Today's high capacity MLC NAND flash, with 4 level sensing, has a very high bit error rate. Not just from writing, but from 'read disturbances" where the stored charge is degraded from reading or writing a physically nearby cell. So these multi-level high capacity devices (say, more than 4GB per chi...
by stevech
Thu Apr 07, 2016 6:08 am
Forum: Advanced users
Topic: 802.15.4 radio for Raspberry Pi2
Replies: 2
Views: 854

Re: 802.15.4 radio for Raspberry Pi2

Use an XBee Series 1. Series 2 is Zigbee only and unless your nodes move and NEED mesh networking, or nodes NEED to interoperate with home automation ZIgbee things (assuming the things don't hold this proprietary), use Series 1.
Nice Python library for it.
by stevech
Thu Apr 07, 2016 6:05 am
Forum: Advanced users
Topic: PI3 microSD and wear leveling
Replies: 33
Views: 29550

Re: PI3 microSD and wear leveling

SD cards (and other MLC NAND flash things like cameras, TVs) have a flash controller chip in addition to the NAND array. The controller is very clever about wear leveling, bad-block remapping, and so on. Here's one popular vendor of controller chips sold (only) to OEMs of flash devices. http://www.p...
by stevech
Thu Apr 07, 2016 6:00 am
Forum: General discussion
Topic: How to create 3G->WiFi router?
Replies: 3
Views: 1088

Re: How to create 3G->WiFi router?

3G cellular to WiFi router?
Cradlepoint has some older models (and see eBay) that support USB cellular modems. CBR900.
They also have some with the cellular modem within the box.
Cradlepoint has "WiFi as WAN" - well done.

Many wifi routers have support for USB cellular modems.
by stevech
Wed Mar 30, 2016 6:37 am
Forum: General discussion
Topic: Pi Zero
Replies: 17
Views: 2725

Re: Pi Zero

A few thousand went out in March. I received one from Adafruit in the US. So I have 2 now.
Hen's teeth!
by stevech
Wed Mar 09, 2016 6:10 am
Forum: Python
Topic: File saved in Python 3, it opens in Python 2
Replies: 9
Views: 2165

Re: File saved in Python 3, it opens in Python 2

Or, as I do, avoid python 3. Keep it simple.
by stevech
Tue Feb 23, 2016 4:51 am
Forum: General discussion
Topic: Dog Intercom
Replies: 7
Views: 1558

Re: Dog Intercom

Many webcams have two-way audio as an option. Often used for gate entry cam
by stevech
Fri Feb 19, 2016 9:51 pm
Forum: Python
Topic: Dictionary for C struct?
Replies: 6
Views: 1237

Re: Dictionary for C struct?

Different approach

Using an unsigned long that contains the date and time, in standard form (epoch time, seconds since 1/1/1970). Then comparing with < == > is trivial.
There are library routines to convert from Gregorian time to epoch time and vice-versa.
In C and also Python.
by stevech
Sun Feb 14, 2016 7:34 am
Forum: Python
Topic: Learning Python
Replies: 16
Views: 2343

Re: Learning Python

Douglas6 wrote:
stevech wrote:Beginner should learn Python 2.7 on a PC well before doing so on an RPi.
Wrong.
kusti8 wrote:The Pi was made for learning to program
Right.

"wrong"... per you. My recommendation is mine. You have your own opinion.
by stevech
Sun Feb 14, 2016 12:33 am
Forum: Advanced users
Topic: RPI 2B can't load sketch to Arduino Pro Mini
Replies: 20
Views: 5242

Re: RPI 2B can't load sketch to Arduino Pro Mini

User a serial or USB/serial bootloader, not this SPI programmer method.
Get an Arduino with the bootloader for serial pre-installed.
by stevech
Sun Feb 14, 2016 12:32 am
Forum: Advanced users
Topic: Sharing images over wifi from laptop/phone to raspberry pi
Replies: 1
Views: 459

Re: Sharing images over wifi from laptop/phone to raspberry

By far, easiest is to transfer using thumb drive.
Else search and read about samba (SMB) setup on RPi, so you can mount a share created by the Laptop. But if you don't know the jargon and haven't do this, stick to the thumb drive.
by stevech
Sun Feb 14, 2016 12:29 am
Forum: Python
Topic: Learning Python
Replies: 16
Views: 2343

Re: Learning Python

Beginner should learn Python 2.7 on a PC well before doing so on an RPi. Learn by example - good code from others. Lots of online tutorials. Books: Beginning Python, from novice to professional. 2nd edition. Magnus Lie Hetland. Apress. Python Phrasebook (a reference manual). Brad Dayley. Sams Publis...
by stevech
Fri Feb 12, 2016 5:41 am
Forum: Advanced users
Topic: telemetry application
Replies: 1
Views: 429

Re: telemetry application

how is the serial (?) data framed? A standard like x.25?
LAN? WiFi>

12mbps constant.. quite difficult.

more specifics please
by stevech
Wed Feb 10, 2016 8:00 am
Forum: Advanced users
Topic: 4TB new external on PI2
Replies: 8
Views: 1369

Re: 4TB new external on PI2

I use the LAN/WiFi and SMB for RPi to access a share on my 2 x 3TB drive Synology NAS.
by stevech
Sun Feb 07, 2016 6:27 am
Forum: Advanced users
Topic: What's tools and process to port Pi to FreeRTOS
Replies: 2
Views: 655

Re: What's tools and process to port Pi to FreeRTOS

Makes no sense because RPi is intrinsically Linux based and the I/O drivers are for Linux.
by stevech
Tue Jan 26, 2016 6:47 am
Forum: Python
Topic: Receiving emails on Pi
Replies: 26
Views: 6225

Re: Receiving emails on Pi

Excessive PITA on small comptuers. I avoid python 3 and its pythonic excesses.
by stevech
Sun Jan 24, 2016 7:51 pm
Forum: Advanced users
Topic: Characterizing GPIO input pins
Replies: 44
Views: 18866

Re: Characterizing GPIO input pins

Logic levels for input... just follow the specifications for the chip from the manufacturer. Use their spec sheet test config. since the levels vary a bit with what external impedance exists.
by stevech
Mon Jan 18, 2016 5:41 am
Forum: Python
Topic: Piezo buzzer barely audible with MCP23017
Replies: 5
Views: 1310

Re: Piezo buzzer barely audible with MCP23017

a PWM signal at the resonant frequency of the piezo (see spec sheet) is needed. Also probably need a transistor on the GPIO output so the drive to the Piezo is more current. Mainly, it's getting the frequency correct. At best, Piezo is feeble as a buzzer.

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