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by wallabybob
Wed Nov 14, 2012 1:37 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Help with RTC
Replies: 19
Views: 14259

Re: Help with RTC

Has anyone used one of these tiny rtc modules. http://www.ebay.co.uk/itm/170794819927?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 I bought a similar module on eBay and encountered some challenges getting it to work the way I wanted with Raspbian. Before connecting the Tiny RTC board I brough...
by wallabybob
Sat Jul 07, 2012 6:29 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Multiple USB > Serial adaptors
Replies: 31
Views: 19809

Re: Multiple USB > Serial adaptors

I suspect it is unlikely your system has a device /dev/ttyUSBCCost. USB serial ports on Linux system are usually named /dev/ttyUSB0, /dev/ttyUSB1, /dev/ttyUSB2 etc.

Please post the output of the shell command: ls /dev/ttyUSB*
by wallabybob
Mon Jul 02, 2012 1:10 am
Forum: General discussion
Topic: Does anyone have this cheapo DVB-T/Analog tuner from Ebay?
Replies: 10
Views: 4799

Re: Does anyone have this cheapo DVB-T/Analog tuner from Eba

fodi wrote: yes, it might be there but since i do not know anything about its chipset
Linux shell command lsusb might identify the chipset. If you post the output here a reader might decode it for you.
by wallabybob
Wed Jun 13, 2012 2:05 am
Forum: Automation, sensing and robotics
Topic: Raspi-powered seismometer/seismograph
Replies: 63
Views: 38144

Re: Raspi-powered seismometer/seismograph

dgoadby wrote:If folks are interested I will post my findings here.
Yes please.
by wallabybob
Wed May 30, 2012 11:28 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C ADC
Replies: 99
Views: 28801

Re: I2C ADC

I would imagine that the 2 slave address pins could be configured to give 4 distinct addresses, as they will be binary selectors i.e numbers 0,1,2,3. Some I2C devices provide for additional address bits by allowing more than two options for the address input on the device: for example, the address ...
by wallabybob
Mon Apr 16, 2012 3:07 am
Forum: Beginners
Topic: Battery Life
Replies: 24
Views: 13915

Re: Battery Life

<t>If you have some basic electronic tools and knowledge you could use a DC switchmode step down converter which will take (say) a voltage between 6v and 20V and convert it to 5V. You could use this a 12v car battery or at least 5 NiMh batteries. These converters are readily available from eBay sell...
by wallabybob
Thu Feb 09, 2012 3:42 am
Forum: Other projects
Topic: Suggestion: Tiny PCB for DC-anything to 5 V DC
Replies: 50
Views: 14425

Re: Suggestion: Tiny PCB for DC-anything to 5 V DC

<r>The dropout voltage for a regulator is the minimum difference between input and output voltage at which the regulator is still in control of the output voltage.<br/> <br/> The National Semiconductor datasheet for the LM2956 discussed in some replies suggests it has a dropout voltage of around 0.9...
by wallabybob
Mon Feb 06, 2012 4:08 am
Forum: General discussion
Topic: Can you power the Pi from GPIO?
Replies: 31
Views: 6314

Re: Can you power the Pi from GPIO?

<r>DeliciousRaspberryCake said: <br/> <br/> <br/> and @plugwash your explanation including the inductors was clear to me. I'm not into the physics of it, though from what I can tell that story only goes from stepping down. I currently can't think of a way how by switching on and off a source, the vo...
by wallabybob
Thu Jan 26, 2012 1:32 am
Forum: Other projects
Topic: Re: Making VPN router
Replies: 11
Views: 3892

Re: Making VPN reouter

The Alix 2D13 has pins for GPIO and I2C - see http://pcengines.ch/alix2d13.htm
by wallabybob
Thu Jan 26, 2012 1:15 am
Forum: General discussion
Topic: Wireless WebDAV NAS with AirPlay for iPads in school classrooms?
Replies: 1
Views: 1628

Re: Wireless WebDAV NAS with AirPlay for iPads in school classrooms?

seanudal said:


Hi,

The only problem would be converting from HDMI to VGA for all the school projectors.


The Raspberry PI also has a composite video output. A number of data projectors I've looked at have composite video inputs.
by wallabybob
Mon Jan 16, 2012 9:30 pm
Forum: Other projects
Topic: Modding a cheap CardReader/USB Hub
Replies: 9
Views: 4354

Re: Modding a cheap CardReader/USB Hub

I suspect the Woolworths in the original post is Woolworths in Australia which may not have any significant connection to a Woolworths in any other part of the world. I've seen the devices in my local (Australian) Woolworths supermarket.
by wallabybob
Sat Nov 19, 2011 7:43 am
Forum: Other projects
Topic: In-line Sniffer?
Replies: 27
Views: 18900

Re: In-line Sniffer?

<r>Quote from samcrawford on November 18, 2011, 13:24<br/> Another alternative would be to look at a cheap router that supports OpenWrt (and therefore tcpdump), run this as a bridge (between LAN and WAN, so no routing), and then sniff packets on the WAN port. Many of these devices have USB and can b...
by wallabybob
Mon Nov 14, 2011 2:42 am
Forum: General discussion
Topic: Some power related questions
Replies: 7
Views: 1439

Re: Some power related questions

<r>[quote]<B><s>[b]</s>Quote from Dagger on November 13, 2011, 15:25<e>[/b]</e></B><br/> I find the calculation easier to do by converting into Watt-hours: the 10.8 V, 4.4 Ah netbook battery provides 10.8 V * 4.4 Ah = 47.52 Watt-hours. The Raspberry Pi model A was reported to need 300 mA at 5 V, whi...
by wallabybob
Wed Nov 09, 2011 1:02 pm
Forum: General discussion
Topic: An example of where this project may help Education in the Pacific
Replies: 5
Views: 1360

Re: An example of where this project may help Education in the Pacific

<t>Some TVs have HDMI inputs and will accept 12V power. We\'re planning to use LEDs for lighting so will probably be able to avoid any mains voltage and associated losses in inverters.<br/> <br/> I working with a couple of friends who have been to the first site (I haven\'t). There is no mains elect...
by wallabybob
Tue Nov 08, 2011 3:49 am
Forum: General discussion
Topic: An example of where this project may help Education in the Pacific
Replies: 5
Views: 1360

Re: An example of where this project may help Education in the Pacific

<r>[quote]For a classroom of 10 systems the power budget comes down to around 300W rather than 1000W... freeing up 700W that can be used on other things.[/quote]<br/> Or reduce the number of solar panels required.<br/> <br/> I\'m doing similar considerations for a number of locations in the Solomon ...
by wallabybob
Sun Sep 11, 2011 10:32 am
Forum: Other projects
Topic: Break out board (GPIO, SPI, I2C, and UART)
Replies: 189
Views: 38185

Re: Break out board (GPIO, SPI, I2C, and UART)

There is quite a selection of peripherals that could be accessed over the I2C bus: ADCs, temperature sensors, light intensity, pressure sensors, accelerometers etc maybe GPIO.
by wallabybob
Fri Sep 02, 2011 12:59 am
Forum: Other projects
Topic: OLED Screens
Replies: 13
Views: 7189

Re: OLED Screens

<r>Some of the small cheap Chinese screens come as modules with a 4 bit or 8 bit data bus and a few control lines that can all be driven by a parallel port or enough GPIO pins. The screens I am talking about are generally character oriented (e.g. 4 lines of 20 characters each) but I think I have see...

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