Go to advanced search

by peterlite
Wed May 17, 2017 11:32 pm
Forum: General discussion
Topic: SD Cards Images for Pi 3 and Pi Zero
Replies: 5
Views: 6139

Re: SD Cards Images for Pi 3 and Pi Zero

There are several posts on this. Google search will do a better job of finding them compared to the forum search. The main problem are installation of software outside of Raspbian. Raspbian software is compiled to be backwards compatible with all models of Pi. Compiling your own software, or install...
by peterlite
Wed May 17, 2017 11:28 pm
Forum: Off topic discussion
Topic: WannaCrypt Microsoft updates for older Windows systems
Replies: 10
Views: 2233

Re: WannaCrypt Microsoft updates for older Windows systems

One of the selling points for Windows was backward compatibility. If you cannot upgrade an old machine from XP to the next release, you complain to Microsoft. Millions did complain about Vista and Vista was quickly replaced by Windows 7. Windows 7 was not an expensive upgrade. In cost terms, it is e...
by peterlite
Tue May 16, 2017 11:44 pm
Forum: Automation, sensing and robotics
Topic: Greenhouse project - I'm a noob
Replies: 6
Views: 2299

Re: Greenhouse project - I'm a noob

Google does a better job of finding things in the forums, compared to the forum search. There are posts on connecting a Pi to the Web and Android. There are discussions on the use of Nagios and similar free open source software as a base for your monitoring. Do you know any Web related programming l...
by peterlite
Tue May 16, 2017 8:27 am
Forum: Off topic discussion
Topic: Need a new desktop Linux PC
Replies: 9
Views: 1756

Re: Need a new desktop Linux PC

Quiet is well worth the effort. Any processor around 80~90 watts with one of the many fanless heatsinks. You can get huge speed with no fan. The fastest graphics card with no fan. SSD instead of disk. A large diameter PWM fan in a large power supply. Case with good airflow. Most of the low noise opt...
by peterlite
Mon May 15, 2017 9:27 am
Forum: AIY Projects
Topic: STICKY: Welcome to the AIY Projects forum!
Replies: 42
Views: 42929

Re: Welcome to the AIY Projects forum!

What is AIY?
by peterlite
Mon May 15, 2017 9:25 am
Forum: C/C++
Topic: Any simple GUI for raspberry?
Replies: 5
Views: 1354

Re: Any simple GUI for raspberry?

Do you want the GUI for one program or the OS?
by peterlite
Mon May 15, 2017 3:09 am
Forum: General discussion
Topic: Powering 5 120mm 12V DC fans from a PI?
Replies: 5
Views: 3361

Re: Powering 5 120mm 12V DC fans from a PI?

A 12 volt relay would work. The Pi has 3.3 and 5 volt digital output. You need a relay with a matching input. The Pi power output is very low. Choose a relay with an input amp. There are posts recommending relays. Google does a better search than the forum search.
by peterlite
Mon May 15, 2017 3:05 am
Forum: General discussion
Topic: Reliable Flash Storage
Replies: 6
Views: 3270

Re: Reliable Flash Storage

I replaced a 2.5" SSD with an mSATA SSD in a small enclosure. You can get up to a terabyte that way. M.2 replaced mSATA in new machines and has several different physical sizes.

The mSATA SSD was left over from a notebook upgrade, making the project really cheap.
by peterlite
Mon May 15, 2017 2:53 am
Forum: Beginners
Topic: Canon Scanner
Replies: 1
Views: 781

Re: Canon Scanner

The manufacturer writes code for Windows then the bulk of open sourcers write code for X86 if the scanner is popular. You then have to compile for the Pi. Do you have a Linux Mint, Ubuntu, or Debian machine? If you can make the scanner work there, the only issue is compiling. A failure on the X86/AM...
by peterlite
Mon May 15, 2017 2:44 am
Forum: Off topic discussion
Topic: WannaCrypt Microsoft updates for older Windows systems
Replies: 10
Views: 2233

Re: WannaCrypt Microsoft updates for older Windows systems

The bosses of those organisations update their BMWs, Mercedes, and Audis every three years to ensure they have the latest airbags and cup holders. They know the importance of current technology.
by peterlite
Fri May 12, 2017 2:01 am
Forum: General discussion
Topic: My rapsberry pi keeps filling up with temps
Replies: 2
Views: 485

Re: My rapsberry pi keeps filling up with temps

If you are rebooting each day, you can create the tmp directory in memory. The directory will be created clean each time you boot. My Pi 3 projects, with 1 GB of memory, have plenty of room for tmp in memory. My Pi Zero projects do not have enough memory spare for tmp in memory.
by peterlite
Tue May 09, 2017 8:18 am
Forum: Camera board
Topic: Better camera needed
Replies: 17
Views: 11792

Re: Better camera needed

Everything "bigger" and "better" costs money for a reason. Big brand name cameras are way over priced but you cannot do big and better for nothing. Some people want waterproof. Some want zoom and that means motors. Some want big lenses and a lens that is double the diameter is four times the materia...
by peterlite
Mon May 08, 2017 11:27 pm
Forum: Other projects
Topic: Accurate measurements of solar powered 12 volt SLA battery
Replies: 4
Views: 822

Re: Accurate measurements of solar powered 12 volt SLA batte

The LTC2947 looks good. Solves a lot of problems. A local supplier has the the 45 in the right package but not the 47. Will shop around. Dividing the total range, 100 volts, by 12 bits should be equivalent of 25 volts at 10 bits, one bit more than I need.
by peterlite
Mon May 08, 2017 4:07 am
Forum: Other projects
Topic: Accurate measurements of solar powered 12 volt SLA battery
Replies: 4
Views: 822

Accurate measurements of solar powered 12 volt SLA battery

I can use a voltage divider into an analogue to digital chip but what range and what accuracy? I want to measure voltages both sides of a solar controller to high accuracy and I prefer to use the same circuit design. Solar panels mention peak voltages near 30 volts. Has anyone found higher voltages?...
by peterlite
Mon May 08, 2017 12:05 am
Forum: Beginners
Topic: What kind of devices I need for develop
Replies: 8
Views: 1084

Re: What kind of devices I need for develop

I use an ultrabook with two screens plugged in. The Pi 3B is just as fast for editing code and running good code. For me, the two problems with the Pi are the one HDMI output and the disk access speed limit. Some of my projects require searching through terabytes and the Pi USB 2 interface is too sl...
by peterlite
Sun May 07, 2017 4:47 am
Forum: General discussion
Topic: High Endurance SD card
Replies: 47
Views: 18960

Re: High Endurance SD card

Most Sandisk cards are shock proof and water proof. The HE cards add temperature protection up to 85 degrees instead of 60 degrees. You need that for a dashcam with the sunlight pouring in. The most common failures in the world of Pi are file system errors due to power failure while writing. No card...
by peterlite
Sat May 06, 2017 1:54 am
Forum: Beginners
Topic: RPI3 Rear View Cam
Replies: 5
Views: 1803

Re: RPI3 Rear View Cam

A Pi Zero or Zero W would be sufficient for just recording. Use a big microSD card as video chews up disk space.
by peterlite
Fri May 05, 2017 3:04 pm
Forum: General discussion
Topic: presentation tools
Replies: 2
Views: 400

Re: presentation tools

I ran a professional presentation on a Pi Zero. It works. For most things you need the extra speed of a Pi 3 and you need a fast SD card. I presented The Pi technology using LibreOffice, NginX, MySQL, and a CMS. LibreOffice was workable from a very fast microSD card screen transitions were too slow ...
by peterlite
Thu May 04, 2017 11:35 pm
Forum: Beginners
Topic: Add a power switch to your Pi
Replies: 0
Views: 258

Add a power switch to your Pi

One common beginner post asks about a power switch for the Raspberry Pi. Now there is an article in MagPi providing an answer. Safely shut down your Pi without having to pull the plug The article is in MagPi 57: https://www.raspberrypi.org/magpi-issues/MagPi57.pdf Feel free to add links to other art...
by peterlite
Thu May 04, 2017 2:52 am
Forum: Beginners
Topic: All-In-One Entertainment Center
Replies: 3
Views: 2027

Re: All-In-One Entertainment Center

Re case, any plastic box will let Wifi pass through. Cut holes for air flow. A heatsink could be useful. A fan is not needed when you place the box vertical and have bottom to top airflow.
by peterlite
Thu May 04, 2017 2:48 am
Forum: Staffroom, classroom and projects
Topic: Raspberry Pi for teaching physics
Replies: 20
Views: 8432

Re: Raspberry Pi for teaching physics

For the touchscreen size, try some phones and tablets. I have a full size phone and still have problems hitting the right key on the on-screen keyboard. I would use 10" minimum for a full keyboard. The problem would be finding a shirt with a 10" pocket. :shock:
by peterlite
Thu May 04, 2017 2:38 am
Forum: General discussion
Topic: Problem - TL-WN722N v2.0
Replies: 10
Views: 17261

Re: Problem - TL-WN722N v2.0

For anyone buying wireless adapters, it is common to find different chips in each version and, sometimes, different chips in each batch or shipments to different countries. Finding the USB chip id line in lsusb is the only reliable way of identifying the chip.
by peterlite
Thu May 04, 2017 2:29 am
Forum: Advanced users
Topic: RPi3 - Running 2.5" HDD "off the shelf" - Risks?
Replies: 5
Views: 873

Re: RPi3 - Running 2.5" HDD "off the shelf" - Risks?

My 2.5" disks peak at about 0.8 amp which makes the 1.2 amp USB output sufficient for a disk and a USB headphone capable of inflicting ear drum damage. Some very old 2.5" disks had 7200rpm and startup currents approaching 1.5 amps. Today they are designed for USB 3 which supplies only 0.9 amps. If t...
by peterlite
Thu May 04, 2017 2:18 am
Forum: Troubleshooting
Topic: Is PI USB Boot Killing my Pendrive?
Replies: 6
Views: 1479

Re: Is PI USB Boot Killing my Pendrive?

For people worrying about the "official" 2.5 amp power supply, you use the official power supply to guarantee full voltage under load and a connecting wire thick enough to carry the power at full voltage. Substitutes can have problems supplying full voltage under load. 2.5 amps runs a Pi 3B with a 2...
by peterlite
Thu May 04, 2017 2:07 am
Forum: Other projects
Topic: Pi Mounting Screw
Replies: 8
Views: 12836

Re: Pi Mounting Screw

300 M3 AU$6.88 including postage to AU. http://www.ebay.com.au/itm/300Pcs-Hex-Screw-Nut-Spacer-Stand-off-Varied-Length-Assortment-Kit-Set-Box/172574704957?_trksid=p2385738.c100677.m4598&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20160908110712%26meid%3Df36c2483abc24b8f8159002d13cda6a0%...

Go to advanced search