Raspberry Pi Forums

stevech

I'll guess that the monitor can't do that resolution with HDMI. Rather than display port,

stevech

Author is regurgitating old news, wrong vendor names.

stevech

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.

stevech

Needs more developer testing / debugging? Including missing installation script (.deb doesn't have dependencies in it).

stevech

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 ... ...

stevech

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.

stevech

Adafruit is a good outfit.
And they have that New York attitude

stevech

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...

stevech

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.

stevech

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...

stevech

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.

stevech

A few thousand went out in March. I received one from Adafruit in the US. So I have 2 now.
Hen's teeth!

stevech

Or, as I do, avoid python 3. Keep it simple.

stevech

Many webcams have two-way audio as an option. Often used for gate entry cam

stevech

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.

stevech

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.

stevech

User a serial or USB/serial bootloader, not this SPI programmer method.
Get an Arduino with the bootloader for serial pre-installed.

stevech

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.

stevech

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...

stevech

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

12mbps constant.. quite difficult.

more specifics please

stevech

I use the LAN/WiFi and SMB for RPi to access a share on my 2 x 3TB drive Synology NAS.

stevech

Makes no sense because RPi is intrinsically Linux based and the I/O drivers are for Linux.

stevech

Excessive PITA on small comptuers. I avoid python 3 and its pythonic excesses.

stevech

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.

stevech

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.

Search found 144 matches

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Re: Piezo buzzer barely audible with MCP23017