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by Ronaldlees
Thu Jul 07, 2016 1:40 pm
Forum: Automation, sensing and robotics
Topic: RF Tranmitter/Recivers
Replies: 15
Views: 3839

Re: RF Tranmitter/Recivers

The RFM69 units come in a 433 MHz variety, which does give a little better range (the nRF24 operates only in the 2.4 GHz band, which is more affected adversely by walls).

Unfortunately, 433 MHz is not an ISS unlicensed band in the U.S. :-(
by Ronaldlees
Thu Jul 07, 2016 1:06 pm
Forum: Automation, sensing and robotics
Topic: RF Tranmitter/Recivers
Replies: 15
Views: 3839

Re: RF Tranmitter/Recivers

For the nRF24, you might have a look at http://tmrh20.github.io/RF24Ethernet/ This is a library which provides TCP/IP mesh networking with the nRF24 modules... and it will work on both arduino and raspy ;) regards, MikeDK Thanks for the link! Yes, the nRF24 is a nice little board. I'm using them on...
by Ronaldlees
Thu Jul 07, 2016 12:44 pm
Forum: Off topic discussion
Topic: Cypress
Replies: 10
Views: 2896

Re: Cypress

Actually, I can see a purpose for the data. The fridge temperature dips occasionally when somebody opens the door to get some cheese dip and veggies. A fridge snitch that puts out page after page with exactly the same temperature in the line items, is a nice "they're on vacation, and it's safe to sa...
by Ronaldlees
Thu Jul 07, 2016 12:34 pm
Forum: Off topic discussion
Topic: Cypress
Replies: 10
Views: 2896

Re: Cypress

Thanks for all the info ... I agree that IoT is more about buzzwords than market adaption. Recently I went to look at Sparkfun's "data pages," where everyone is encouraged to transmit IoT data directly into the Sparkfun database in realtime. After looking at dozens of pages of random people's unchan...
by Ronaldlees
Wed Jul 06, 2016 5:49 pm
Forum: Off topic discussion
Topic: Cypress
Replies: 10
Views: 2896

Cypress

I read somewhere that Broadcom's IoT division was purchased by Cypress. This is likely news only for me, but old news for everybody else. I wonder if it impacts the raspberry ecosystem at all, if it is true.
by Ronaldlees
Sun Jun 05, 2016 1:13 pm
Forum: Automation, sensing and robotics
Topic: RF Tranmitter/Recivers
Replies: 15
Views: 3839

Re: RF Tranmitter/Recivers

I would suggest taking at look at the Moteino from LowPowerLab.com. They are 433Mhz, dirt cheap and I am using one Pi to talk to over 20 of them. Not sure they will meet your needs, but might be worth a look. Had a look at those devices. Nice! Having one unit instead of two surely would uncomplicat...
by Ronaldlees
Sat Jun 04, 2016 8:21 pm
Forum: Automation, sensing and robotics
Topic: RF Tranmitter/Recivers
Replies: 15
Views: 3839

Re: RF Tranmitter/Recivers

You might consider the nRF24 plus an Arduino (or for going really cheap, an Attiny85 or Adafruit Trinket ) - the latter two devices are around $5 or $8, and I've seen ways to make them interface with the nRF24, either with bit-banging SPI or regular SPI. The nRF24 is itself about the same money as t...
by Ronaldlees
Fri May 20, 2016 1:22 pm
Forum: RISCOS
Topic: Antivirus Firewall ?
Replies: 14
Views: 6678

Re: Antivirus Firewall ?

Even if someone was attempting to hack your RISC OS, what program is there to accept the connection? If you are running a server application, or other application that will accept an incoming connection it likely will not allow outsiders to make any modifications to your system (as such commands ar...
by Ronaldlees
Sat May 07, 2016 3:08 pm
Forum: Other projects
Topic: Rugged case for official touchscreen
Replies: 3
Views: 2492

Re: Rugged case for official touchscreen

I like aluminum for ruggedness. I have a 5" aluminum (Hammond) case for one of my SBC projects. Something aluminum in the 8" range could be a little pricey though, maybe $30-$40, while my five incher was only $16. There seems to be a blind spot in the enclosure manufacturing biz, and right-sized tou...
by Ronaldlees
Sat May 07, 2016 2:22 pm
Forum: HATs and other add-ons
Topic: 10 inch touch display - magical unicorn?
Replies: 10
Views: 26816

Re: 10 inch touch display - magical unicorn?

Hi: You might consider some of the lower resolution displays. Due to the "magic" of GPU scaling, a 1024x600 screen can look pretty good with "scaled" 1280x1024 resolution. I have a 1024x600 screen, and it looks pretty good (to my eyes anyway) - at 1280x1024. Maybe at 1900 it's a little iffy, but wor...
by Ronaldlees
Thu Apr 21, 2016 2:03 pm
Forum: HATs and other add-ons
Topic: PI2MEDIA DAC HAT with Hybrid Tube Amp
Replies: 9
Views: 4028

Re: PI2MEDIA DAC HAT with Hybrid Tube Amp

Absolutely Gorgeous! This is coming from a guy who used to bathe in the amber glow of his one tube ham transmitter, at midnight!

But, they probably have comm-ad restrictions here. I hope not, cuz it's so purrrrty!
by Ronaldlees
Thu Apr 21, 2016 1:58 pm
Forum: HATs and other add-ons
Topic: 10" Sunlight readable touchscreen
Replies: 1
Views: 2042

Re: 10" Sunlight readable touchscreen

This is a condundrum for a lot of people. They have sunlight screens available, but they're both power hungry and expensive. I've seen a few paper white displays (also e-ink) for sale on Amazon, but they're usually very small (5 inches or so). They are basically like the Kindle display (same technol...
by Ronaldlees
Thu Apr 21, 2016 1:45 pm
Forum: HATs and other add-ons
Topic: Battery Options
Replies: 8
Views: 1218

Re: Battery Options

Id rather use NiMH than lithium. Their less... Explod-y That's especially true when working with charging circuits. Although I still recommend that people educate themselves thoroughly about batteries, and consult advice from experts (I'm not one of those) before doing anything with battery circuit...
by Ronaldlees
Tue Apr 19, 2016 10:15 pm
Forum: HATs and other add-ons
Topic: Setup of GPS with Pi2
Replies: 1
Views: 458

Re: Setup of GPS with Pi2

In the second installement of this conundrum, I observed that the signal went down slightly when I put the cover on the enclosure. It didn't go down to the level that I observed prior to moving the active antenna, but it went down to the point of being marginal. Lifting the lid caused the SNR to jum...
by Ronaldlees
Tue Apr 19, 2016 7:25 pm
Forum: HATs and other add-ons
Topic: Setup of GPS with Pi2
Replies: 1
Views: 458

Setup of GPS with Pi2

I purchased a U-Blox chipset based GPS, and connected it to a Pi2 using the UART (four wire connection: 3.3VDC, TX, RX, GND). I had some trouble getting it to obtain the slow "first fix" that is necessary before a GPS device will obtain regular quick fixes. I spent a lot of time walking around in an...
by Ronaldlees
Tue Apr 19, 2016 6:52 pm
Forum: HATs and other add-ons
Topic: Battery Options
Replies: 8
Views: 1218

Re: Battery Options

I like NIMH. I picked it for a Pi UPS I made. I like how they can be trickle charged and generally don't fail catastrophically. Their capacity is not bad these days and AA NIMH cells can be found in almost every corner of the world at reasonable prices. I would guess they are the most common consum...
by Ronaldlees
Tue Apr 19, 2016 6:41 pm
Forum: HATs and other add-ons
Topic: Battery Options
Replies: 8
Views: 1218

Re: Battery Options

mikronauts wrote:I've had excellent success using 5200mAh and larger USB power banks.

One example: http://www.mikronauts.com/robot-zoo/elf-2wd-pi-robot/
Love the robot! I wonder if the four cell pack is NiMH, or other?
by Ronaldlees
Mon Apr 18, 2016 1:31 pm
Forum: HATs and other add-ons
Topic: Battery Options
Replies: 8
Views: 1218

Re: Battery Options

Well, I know the answer to that question - Lithium. But, I wonder if any others, like me, see the advantages in the slightly older technology of NiMH (Nickel Metal Hydride) batteries? They are just now starting to be found on shelves here in the US, at department stores, and even a few grocery store...
by Ronaldlees
Sat Apr 16, 2016 4:40 pm
Forum: HATs and other add-ons
Topic: Battery Options
Replies: 8
Views: 1218

Battery Options

I wonder which battery options people consider when using the Pi? I have had good success with NiMH packs. Does everybody else use them, or is everyone using Lithium?

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