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by hippy
Mon Jun 18, 2018 7:22 pm
Forum: General discussion
Topic: Power for stacking Pi's
Replies: 15
Views: 434

Re: Power for stacking Pi's

A quick search on Amazon got this: https://www.amazon.co.uk/Switching-Transformer-Surveillance-Industrial-Automation/dp/B01JLYWBUC/ref=mp_s_a_1_4?ie=UTF8&qid=1529348087&sr=8-4&pi=AC_SX236_SY340_QL65&keywords=5v+60a+power+supply&dpPl=1&dpID=41T4v6X8qFL&ref=plSrch That's the sort of thing I would cho...
by hippy
Mon Jun 18, 2018 6:31 pm
Forum: General discussion
Topic: Power for stacking Pi's
Replies: 15
Views: 434

Re: Power for stacking Pi's

Projects and products for multi-RPi installs are woefully neglected. Plenty of options and products for doing the job. Plenty of posts about the subject. And there seems to be project examples of doing it on the web. There are basically three ways of doing it - 1) One PSU per Pi or set of Pi's 2) O...
by hippy
Mon Jun 18, 2018 11:36 am
Forum: Networking and servers
Topic: Trigger RaspberryPi events from Android App
Replies: 5
Views: 94

Re: Trigger RaspberryPi events from Android App

This is a simple Python 2.7 server - #!/usr/bin/python import BaseHTTPServer class HttpHandler(BaseHTTPServer.BaseHTTPRequestHandler): def do_GET(self): self.send_response( 200 ) self.send_header("Content-type", "text/html") self.end_headers() self.wfile.write("<html><body>Hello!</body><html>") Base...
by hippy
Mon Jun 18, 2018 11:24 am
Forum: Networking and servers
Topic: Trigger RaspberryPi events from Android App
Replies: 5
Views: 94

Re: Trigger RaspberryPi events from Android App

In my case both my Pi and my android phone will be connected to a single wifi. I want to communicate between the two devices over this wifi. If you are talking about pi being an AP standalone server , I unfortunately do not need that. If it is something else , could you please suggest me how to do ...
by hippy
Mon Jun 18, 2018 11:17 am
Forum: Advanced users
Topic: Pi3 as master, multiple Pi Zero W's reporting in... ... ...
Replies: 2
Views: 95

Re: Pi3 as master, multiple Pi Zero W's reporting in... ... ...

DS18B20's are designed to be connected to a single wire in multi-drop mode so theoretically you would only need one GPIO pin regardless of the number of sensors. In practice you will probably find there is a limit short of the almost 700 you have. But it might depend on how far they are from the Pi....
by hippy
Mon Jun 18, 2018 11:04 am
Forum: Networking and servers
Topic: Trigger RaspberryPi events from Android App
Replies: 5
Views: 94

Re: Trigger RaspberryPi events from Android App

It should be possible. MIT App Inventor 2 is simple to use to create Android Apps and can be used to read a file from a server, parse that, handle and display the returned data. All you would need is a server on a Pi which can handle requests, check what Bluetooth devices are found, and returns that...
by hippy
Mon Jun 18, 2018 10:49 am
Forum: Advanced users
Topic: RS232 serial link with Raspberry PI 3
Replies: 6
Views: 145

Re: RS232 serial link with Raspberry PI 3

Your easiest option will be to use a USB-to-RS232 converter.
by hippy
Sun Jun 17, 2018 6:50 pm
Forum: General discussion
Topic: raspberry pi 3 without ethernet cable
Replies: 10
Views: 4249

Re: raspberry pi 3 without ethernet cable

how did you install raspbian or setup wifi without ethernet? i have just began can you point me to a direction? If you have HDMI, keyboard and mouse connected; if you install using NOOBS, and I believe PINN, there's an option to allow the Pi to connect to your WiFi router. If headless then follow t...
by hippy
Sun Jun 17, 2018 5:10 pm
Forum: General discussion
Topic: What to do with this thing?
Replies: 25
Views: 684

Re: What to do with this thing?

Well, I'd say any device that qualified to be used on the ISS for running experiments can't be too dumbed down. Though the ESA did say "the flight units are running a special security-hardened version of Raspbian Jessie Lite", so not purely the standard OS a normal user would get. That said; Raspbi...
by hippy
Sun Jun 17, 2018 4:01 pm
Forum: General discussion
Topic: 2017 - The Pi's best year yet
Replies: 7
Views: 497

Re: 2017 - The Pi's best year yet

Also check out the Raspberry Pi Annual Review , for similar stats and more in an easy to digest magazine format You're right. A picture is worth a thousand words or in this case a simple table. All figures in GBP millions, rounded to nearest 100K. .---------------------------------.----------------...
by hippy
Sat Jun 16, 2018 10:51 am
Forum: General discussion
Topic: Networking project idea
Replies: 2
Views: 162

Re: Networking project idea

I am searching for a project idea for the raspberry pi. It shoudn't be to large and not require any extra hardware ... maybe something with networking? The Pi supports PPP/SLIP to allow two Pi's to use TCP/IP over UART serial, allowing networking between the two and even for one to access the inter...
by hippy
Sat Jun 16, 2018 10:43 am
Forum: Weather station
Topic: DS18B20 using parasitic power
Replies: 2
Views: 245

Re: DS18B20 using parasitic power

If I remember correctly when I was investigating using DS18B20 on the pi when someone else had problems , the pi does not support parasitic power mode. I haven't tried on a Pi but that is not unexpected. The parasitic power mode of the 18B20 has fairly stringent requirements during operation as des...
by hippy
Sat Jun 16, 2018 10:35 am
Forum: Beginners
Topic: Pi Zero W: What image fit best
Replies: 7
Views: 162

Re: Pi Zero W: What image fit best

Since the Pi Zero has a single core SOC with 1GHz it will be not THAT fast as the biggest PI. I am looking for an OS image (Linux of course), which has a light desktop (openbox for example) and is not "fully equipped" with software, which I will not use. IMO the Zero W isn't that sluggish even with...
by hippy
Fri Jun 15, 2018 7:15 pm
Forum: The MagPi
Topic: Downloading current issue as PDF
Replies: 3
Views: 394

Re: Downloading current issue as PDF

And maybe try a different browser, see if that has the same problem.
by hippy
Fri Jun 15, 2018 9:22 am
Forum: Troubleshooting
Topic: I Baked my Raspberry Pi Zero W
Replies: 4
Views: 227

Re: I Baked my Raspberry Pi Zero W

I'd appreciate it if someone could help me out and let me know if there is a through-panel microUSB female jack available outside of China. There are panel mount micro-USB assemblies available though they not be suitable for your own project. One example - https://www.modmypi.com/raspberry-pi/acces...
by hippy
Thu Jun 14, 2018 7:49 pm
Forum: General discussion
Topic: 2017 - The Pi's best year yet
Replies: 7
Views: 497

2017 - The Pi's best year yet

It's that time of year when we get to see how well the Raspberry Pi group has been performing financially and it seems 2017 was the best year yet. Not that anyone couldn't figure that out for themselves, but the numbers are impressive. RPT : https://beta.companieshouse.gov.uk/company/08207441 RPF : ...
by hippy
Thu Jun 14, 2018 4:02 pm
Forum: Raspbian
Topic: Voltage normalised (0x00000000)
Replies: 40
Views: 1365

Re: Voltage normalised (0x00000000)

jamesh wrote:
Thu Jun 14, 2018 10:56 am
If there is an issue with a post, even a mods, please report it.
Has the main forum rule, "the moderators are always right", been rescinded ?

viewtopic.php?t=131922#p880042
by hippy
Thu Jun 14, 2018 3:11 pm
Forum: Automation, sensing and robotics
Topic: Digital VoltMeter for beginners
Replies: 3
Views: 243

Re: Digital VoltMeter for beginners

The project is quite doable. Using a micro or adding an ADC should allow a volt meter to be built round a Pi but I'm not so sure about achieving 16-bit plus sign resolution. Not sure that's even needed. I would suggest that if the project is to have an OLED display it might be better to step it up ...
by hippy
Thu Jun 14, 2018 10:38 am
Forum: Raspbian
Topic: Voltage normalised (0x00000000)
Replies: 40
Views: 1365

Re: Voltage normalised (0x00000000)

Imperf3kt wrote:
Thu Jun 14, 2018 12:10 am
Regarding the polyfuse, there's very little chance people will buy one at $15+P&H to stick on something that already has one...
They seem to be £0.60 in one-off quantities at mouser ...

https://www.mouser.co.uk/ProductDetail/ ... 7pGyDhCQ==
by hippy
Thu Jun 14, 2018 9:14 am
Forum: General discussion
Topic: Cheap Networking
Replies: 10
Views: 381

Re: Cheap Networking

The 'no additional hardware except wire or cable' options for a Pi Zero are PPP/SLIP or USB Ethernet Gadget Mode. MagPi had an article on connecting two Pi computers together using serial but I am afraid I don't recall which issue off-hand. The better choice IMO is to choose a Zero W over a Pi Zero ...
by hippy
Wed Jun 13, 2018 8:05 pm
Forum: Raspbian
Topic: Voltage normalised (0x00000000)
Replies: 40
Views: 1365

Re: Voltage normalised (0x00000000)

Just as an aside; the Pi Slice plus the resin.io Fin and other Compute Module carrier boards do use barrel jacks for their power input. For resin.io boards that allows 6V to 30V operation and therefore requires regulation to get 5V. Supporting a wide range of voltages reminded me that was the primar...
by hippy
Wed Jun 13, 2018 7:00 pm
Forum: Raspbian
Topic: Voltage normalised (0x00000000)
Replies: 40
Views: 1365

Re: Voltage normalised (0x00000000)

could not the existing (and little used?) RUN and PEN pads be, if not replaced, but accompanied by a similar pair of DCIN and GND unpopulated pads? RUN and PEN do have their place but it would be handy if it were a RUN+0V pair as it used to be on earlier Pi and, if adding 0V, one might as well add ...
by hippy
Wed Jun 13, 2018 4:44 pm
Forum: General discussion
Topic: What is configuration of wiring connection use db9 serial port from output device to RPi 3 by IDC10 head connector
Replies: 5
Views: 182

Re: What is configuration of wiring connection use db9 serial port from output device to RPi 3 by IDC10 head connector

There should be some motherboard standards for wiring 9-way to IDC 10-way but not all their wiring is the same, as the company I worked for found out when they bought assemblies from a different supplier than usual. It should be easy enough to figure out what the wiring from one to the other is with...
by hippy
Wed Jun 13, 2018 3:24 pm
Forum: Raspbian
Topic: Voltage normalised (0x00000000)
Replies: 40
Views: 1365

Re: Voltage normalised (0x00000000)

For the application that a PI uses the power connector for, a DC input connector with a very low contacts resistance is of paramount importance, as a drop of say 0.1Volt can cause the received voltage (after the input connector) to drop below the acceptable range of minimal 4.75 Volt. So 5V input g...
by hippy
Wed Jun 13, 2018 1:04 pm
Forum: Beginners
Topic: Where's the power button?
Replies: 11
Views: 332

Re: Where's the power button?

However, the ethernet interface and hardware have to support what is known as "magic packets". Note to self: check out WoL on RPi. ;) Wake On LAN solutions require the WOL hardware to be permanently powered and they then enable power to the rest of the board when they get their magic packet. Pi's s...

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