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by BMS Doug
Fri Jun 23, 2017 12:35 pm
Forum: Automation, sensing and robotics
Topic: Automatic Car Battery Cut off to prevent rundown andAAA call
Replies: 48
Views: 9657

Re: Automatic Car Battery Cut off to prevent rundown andAAA

1. indicated that the battery could not get flat because it would be cut off, 2. that the zero uses VERY LITTLE current, by somebody that actually measured it with a meter (I have one too) The zero is still a full linux PC running an operating system and associated overheads, You can possibly reduc...
by BMS Doug
Thu Jun 22, 2017 3:26 pm
Forum: General discussion
Topic: Use Pi to Read Access Control Cards???
Replies: 1
Views: 511

Re: Use Pi to Read Access Control Cards???

Obviously you will need a card reader attached to the Pi but unfortunately (as you know) there are a variety of types, which aren't all inter-compatible. I guess you'll need a card reader for each type and a way of displaying which card type any given random card is. The best way forward is to start...
by BMS Doug
Tue Jun 20, 2017 9:48 am
Forum: Automation, sensing and robotics
Topic: Robot with 6 degree of freedom manipulator
Replies: 5
Views: 2381

Re: Robot with 6 degree of freedom manipulator

Dear Doug Thank you sharing with your project! Would you have any comments to my post above? Much appreciated! Kind Regards, Eddie something like this one ? http://4.bp.blogspot.com/-re_MRXEPd3c/VSoZ-egwHdI/AAAAAAAAAB4/alpw1VdHuaw/s1600/2015-04-11%2B14.31.56.jpg with a few extra features sure, but ...
by BMS Doug
Fri Jun 09, 2017 8:59 pm
Forum: Off topic discussion
Topic: What happened to British Airways computers?
Replies: 44
Views: 7601

Re: What happened to British Airways computers?

(Long ago) One building I was working in fell over when loadshedding plc lost its memory, of course the UPS kept the CER rooms up long enough for a controlled shutdown but the building had to shut down for a couple of hours. Once the plc had been reloaded with the correct program we were examining t...
by BMS Doug
Fri Jun 09, 2017 3:11 pm
Forum: Off topic discussion
Topic: What happened to British Airways computers?
Replies: 44
Views: 7601

Re: What happened to British Airways computers?

What actually happened: Power failed. UPS cut in. Generators started. Power came back on. Generator 30 minute timer started. Power went off again. Generator timer kept running. Generators shut down... Fortunately the UPS cut back in when the generators stopped and everything kept running until powe...
by BMS Doug
Fri Jun 09, 2017 7:53 am
Forum: Other projects
Topic: UPS for RPI using single supercap or Li-Ion cell
Replies: 2
Views: 1620

Re: UPS for RPI using single supercap or Li-Ion cell

Its nice to see the latest iteration of your work Bud. That's a great looking board, compact and densely packed with components, I don't think I could even begin to solder that. (I've never soldered SMD. For anyone looking to buy a UPS for their pi: There are several commercially available UPS modul...
by BMS Doug
Fri Jun 09, 2017 7:26 am
Forum: Automation, sensing and robotics
Topic: analog input interfacing
Replies: 15
Views: 4553

Re: analog input interfacing

I wish I was getting paid for selling that product :lol:
by BMS Doug
Fri Jun 09, 2017 7:24 am
Forum: Off topic discussion
Topic: What happened to British Airways computers?
Replies: 44
Views: 7601

Re: What happened to British Airways computers?

Something to look out for, make sure that the EPO's in any room you work in are fitted with some kind of cover to prevent accidental operation. It's not good if one gets accidentally operated.
by BMS Doug
Fri Jun 09, 2017 7:18 am
Forum: Automation, sensing and robotics
Topic: analog input interfacing
Replies: 15
Views: 4553

Re: analog input interfacing

Thanks - I like that board even more now! If and only if the 24V (pretty standard in industrial I/O) power supplies ground and the Pi's ground have no common mode issues (ie on the same circuit, grounds tied togeather, or transformer isolated with grounds tied togeather) it should work. Otherwise t...
by BMS Doug
Thu Jun 08, 2017 2:38 pm
Forum: Off topic discussion
Topic: New Pi Malware is here
Replies: 30
Views: 5888

Re: New Pi Malware is here

This relies on the user making their Pi accessible from the internet without changing the default user name and password.

There is no security update possible that will prevent people accessing your Pi if you make it accessible from the internet with the default user name and password.
by BMS Doug
Thu Jun 08, 2017 1:58 pm
Forum: Automation, sensing and robotics
Topic: CamJam Edukit #3 - What is best to power the Pi?
Replies: 10
Views: 1958

Re: CamJam Edukit #3 - What is best to power the Pi?

There are various laws in different countries about the postage of batteries. As the EduKits are sold all over the world (sent from The Pi Hut's warehouse in the UK) it would be very difficult, if not impossible, for them to include batteries with the kits. We therefore recommend that you source yo...
by BMS Doug
Thu Jun 08, 2017 1:36 pm
Forum: Automation, sensing and robotics
Topic: CamJam Edukit #3 - What is best to power the Pi?
Replies: 10
Views: 1958

Re: CamJam Edukit #3 - What is best to power the Pi?

1) You use a Patriot Fuel+ 5200mAh USB battery bank - obviously there are other versions on the market so my question is why have you used 5200mAh as there are many other power ratings. I don't think that there is a specific reason for that rating, Bill recommended that you use 5000mAh or more, thi...
by BMS Doug
Thu Jun 08, 2017 8:09 am
Forum: Off topic discussion
Topic: What happened to British Airways computers?
Replies: 44
Views: 7601

Re: What happened to British Airways computers?

Now they want blame some guy for pulling the plug, and plugging it back incorrectly. There's a somewhat rude word that starts with a "B", ends with a "t" and has "ullshi" in the middle to describe Willy Walsh's attempt to keep his c-level job and to avoid IAG/BA having to pay €600 penalty to every ...
by BMS Doug
Thu Jun 08, 2017 7:39 am
Forum: Automation, sensing and robotics
Topic: analog input interfacing
Replies: 15
Views: 4553

Re: analog input interfacing

Here is a snippet from the wiring schematic for the HAT. 4-20mA.gif It seems that they expect you to use an external power supply (9-24V) for the the 4-20mA sensors? (Ouch, look at pin 8 on TB1, its labelled COM but connected to +V! fortunately the silkscreen on the board correctly identifies it as ...
by BMS Doug
Wed Jun 07, 2017 7:31 am
Forum: Automation, sensing and robotics
Topic: Robot with 6 degree of freedom manipulator
Replies: 5
Views: 2381

Re: Robot with 6 degree of freedom manipulator

something like this one?
Image

with a few extra features sure, but this is run pi an original pi model B, so your extra features would easily be supported by a Pi3.
by BMS Doug
Wed Jun 07, 2017 7:28 am
Forum: Automation, sensing and robotics
Topic: analog input interfacing
Replies: 15
Views: 4553

Re: analog input interfacing

There are some Analogue input HATs available, I haven't tried them so I can't verify their functionality. This module is connected by SPI and suggests that more modules can be daisy chained together (although you would need to find a way to change the chip select pin for each HAT if connecting them ...
by BMS Doug
Wed Jun 07, 2017 7:15 am
Forum: Beginners
Topic: Request for Multiple Circuit Breakers on a single IO, please
Replies: 8
Views: 844

Re: Request for Multiple Circuit Breakers on a single IO, pl

Kevin wishes to know which of the many inputs he is monitoring has broken, not the exact location of the break in cable. Kevin, can I suggest that you combine a reed switch with a DS18B20 sensor in such a fashion that when the reed switch is broken the DS18B20 loses power. By monitoring the array of...
by BMS Doug
Fri Jun 02, 2017 4:00 pm
Forum: Astro Pi
Topic: Sourcing Astro Pi parts from USA-based websites/stores
Replies: 17
Views: 11603

Re: Sourcing Astro Pi parts from USA-based websites/stores

Helpful replies, Doug! That cleared up a few misunderstandings I had (jumper cables also called dupont wires; misprint 23; search for 2x13, not 2x26, lol). That yielded the search results I was expecting. As for the wires and boots, it sounded like I may be overthinking that one. As long they are c...
by BMS Doug
Fri Jun 02, 2017 3:55 pm
Forum: Compute Module
Topic: CM3 Pricing and availability
Replies: 6
Views: 1685

Re: CM3 Pricing and availability

I am working on a project uses the CM3. The pricing and availability is becoming a concern for me; many sources like Arrow and Digikey are listing the module for $50+ while other vendors (Newark) have sporadic availability with really long lead times. Are there better channels to purchase quantitie...
by BMS Doug
Fri Jun 02, 2017 3:33 pm
Forum: Astro Pi
Topic: Sourcing Astro Pi parts from USA-based websites/stores
Replies: 17
Views: 11603

Re: Sourcing Astro Pi parts from USA-based websites/stores

It would probably be easiest tho solder the wires to the buttons, if you don't fancy this you need to find the crimp lug that best fits your button end connector. The insulation boots should be sized for the crimp lug (or you could buy pre-insulated crimp lugs and skip the insulation boot) or use he...
by BMS Doug
Fri Jun 02, 2017 3:14 pm
Forum: Astro Pi
Topic: Sourcing Astro Pi parts from USA-based websites/stores
Replies: 17
Views: 11603

Re: Sourcing Astro Pi parts from USA-based websites/stores

female-to-female jumper wires Extended 23-way 26-way pin header Friction fit crimp M2 cross-head screw M2.5 cross-head screw M2.5 washer M2.5 nut M4 hex nut M4 bolt M2.5 male-to-female stand off M2.5 male-to-female stand off Tactile push-buttons Length of black wire All of my search results focus o...
by BMS Doug
Tue May 30, 2017 11:09 pm
Forum: Troubleshooting
Topic: SD Card Copier can not read source
Replies: 4
Views: 861

Re: SD Card Copier can not read source

Windows software in general seem to expect sd cards to be a single partition and thus don't respond well to a partitioned drive.
You should be able to create an image of your sd card with win32 disc imager.
by BMS Doug
Tue May 30, 2017 10:36 pm
Forum: General discussion
Topic: Is a 2nd Pi (for speed) just a waste on my robot?
Replies: 14
Views: 2409

Re: Is a 2nd Pi (for speed) just a waste on my robot?

I think that you'd be fine with a single pi3, I suspect that any potential speed benefits would be lost during communications between the two raspberries.
by BMS Doug
Mon May 29, 2017 10:05 pm
Forum: The MagPi
Topic: magpi magazine stockists ?
Replies: 11
Views: 4319

Re: magpi magazine stockists ?

pillock wrote:
BMS Doug wrote:
Ashby de la Zouch has a large Schneider office building, I've been there for training courses, plenty of geeks there.
OK, then they have geeks that missed out on the magazine ;)
Probably accelerating as quickly as possible away from Ashby de la Zouch.

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