[QUOTE=pentium;43302506]Free gif.
[IMG]http://i11.photobucket.com/albums/a166/ballsandy/test2.gif[/IMG][/QUOTE]
Mhm gotta love me some standing waves
I'm looking to buy an LCD screen to use with my RasPi, and I have absolutely no idea what I'm doing.. :v:
Does anyone have any experience with using an LCD with a Raspberry Pi? What would you recommend/Are there any guides on the subject?
They should either have a composit or hdmi input I guess
Ah sorry, perhaps I should clarify: I'm looking to buy an LCD panel that I could drive using the GPIO pins on my Raspberry Pi, but I'm not sure what constitutes a good LCD panel and what protocols would be well suited to use with the RasPi. For example, how much does contrast ratio matter? What's a decent response rate?
[QUOTE=Falcqn;43316701]Ah sorry, perhaps I should clarify: I'm looking to buy an LCD panel that I could drive using the GPIO pins on my Raspberry Pi, but I'm not sure what constitutes a good LCD panel and what protocols would be well suited to use with the RasPi. For example, how much does contrast ratio matter? What's a decent response rate? How good is the I2C protocol?[/QUOTE]
Driving an LCD of any size from the GPIO is going to be painfully slow to refresh!
It shouldn't be slow if I'm using the controller board that comes with the panel, right? Sorry if I'm using the wrong terminology.
I'm looking at [URL="http://www.buydisplay.com/default/serial-spi-2-8-tft-lcd-module-display-320x240-touch-sceen-arduino.html"]this[/URL] at the moment, and it comes with the ILI9341 display controller. That should be OK to control using the GPIO on my RPi right?
The thing is, I don't know how good that display is, is 25ms a good response time? How does the contrast/brightness stack up? Should I even be worrying about this or should I just buy the damned display?
I'm taking a course in digital and analog circuits next semester at Uni but I have very little experience with electronics as of now. Since most of you guys seem to be very comfortable with it has any of you got any tips for a beginner? (Online learning resources, books, study methods, etc.)
[QUOTE=Falcqn;43317325]It shouldn't be slow if I'm using the controller board that comes with the panel, right? Sorry if I'm using the wrong terminology.
I'm looking at [URL="http://www.buydisplay.com/default/serial-spi-2-8-tft-lcd-module-display-320x240-touch-sceen-arduino.html"]this[/URL] at the moment, and it comes with the ILI9341 display controller. That should be OK to control using the GPIO on my RPi right?
The thing is, I don't know how good that display is, is 25ms a good response time? How does the contrast/brightness stack up? Should I even be worrying about this or should I just buy the damned display?[/QUOTE]
On a large scale, 25ms response is rather poor, most modern displays are 10 or lower, more often 5 for semi decent screen, however for what you are thinking of using it for I'm sure it would be tolerable, I was thinking when you said LCD panel we were talking a 21" or bigger beastie.
I feel like I'm doing something wrong when using these things.
I have the GaoJie S-993A desoldering gun which is a chinese replica of the Hakko 808. The specs are identical and that I can tell the tips and filters are the same. There's youtube videos showing the 808 and it's related cousins like the ZD985 (which just relocates a lot of the electronics and the pump into an external enclosure) desoldering parts in a few seconds to the point the fall off the board. There's no PCB damage and no weird issues with things like ground planes or thick rails. At most you turn it up to 390c and you can handle just about anything. Eev of all people had an amazing example.
I grabbed a garbage board and spent a few hours desoldering parts and I couldn't do anything. PGA sockets, resistors, DIPS.....nada. Even with the tip cleaned and as tinned as I could get it you couldn't even cleanly desolder a SIP resistor network at 400c. You just swivel the tip around the pin with a little pressure and rip up the PCB in the process. Eventually the solder would show signs of melting and when you started the pump you could do an extremely poor job at clearing the hole.
I can't blame the iron for being knock-off crap because it was both expensive, based off a known good design and this is the EXACT same issue I had with my older bulb powered Radio Shack desoldering iron which WAS cheap crap.
[QUOTE=FPSMango;43317447]I'm taking a course in digital and analog circuits next semester at Uni but I have very little experience with electronics as of now. Since most of you guys seem to be very comfortable with it has any of you got any tips for a beginner? (Online learning resources, books, study methods, etc.)[/QUOTE]
Check the OP, Chrysesus has some great PDFs/Book materials to help you become rather knowledgeable on the topic. I personally recommend "Teach Yourself Electricity & Electronics", it's a bread and butter book that is quite comprehensive. Here's a [URL="http://papers.xtremepapers.com/Edexcel/Advanced%20Level/Electronics/Resources/Gibilisco%20-%20Teach%20Yourself%20Electricity%20And%20Electronics.pdf"]PDF of the 3rd Edition[/URL]. Math for most beginner/intermediate electronics only gets as high as some calculus, complex numbers and *maybe* some differential equations. But most equations have shortcut equations to solve these things much easier.
On top of that, hands on experience is highly encouraged. Look around for beginner kits or just assemble your own amount of parts from old electronics, TVs, computers, etc. Grab a hold of a breadboard, arduino, or any microcontroller, and a load of parts if you want and build whatever intrigues you! Here's a nice site that has a boatload of project circuits that you can jump right into [URL="http://www.discovercircuits.com/list.htm"]Discover Circuits[/URL].
Learning to solder is a cornerstone skill to have for EE, in which you don't have to get into now if you go the breadboard route, but you can just grab a soldering iron, some solder, a stand, and a solder sucker to learn with. You can probably find some irons on eBay for cheap, but the general consensus here is with the Hakko FX-888 if you're looking for a long term investment. Its a great, reliable iron.
Don't feel as you have to go ahead and dump a large amount of money into at first, its as you feel.
[QUOTE=Falcqn;43317325]It shouldn't be slow if I'm using the controller board that comes with the panel, right? Sorry if I'm using the wrong terminology.
I'm looking at [URL="http://www.buydisplay.com/default/serial-spi-2-8-tft-lcd-module-display-320x240-touch-sceen-arduino.html"]this[/URL] at the moment, and it comes with the ILI9341 display controller. That should be OK to control using the GPIO on my RPi right?
The thing is, I don't know how good that display is, is 25ms a good response time? How does the contrast/brightness stack up? Should I even be worrying about this or should I just buy the damned display?[/QUOTE]
Do yourself a favour and buy a microcontroller. The RPi's GPIO is really quite shite to say the least, and without some software effort, you won't be able to directly drive a typical lcd-display, but rather only one that comes with an i2c, spi or uart backpack.
I still wonder about the purpose of the RPi in the electronics domain. Most people seem to abuse it as a microcontroller, just to slap a microcontroller on top of the GPIO header and then control some pins via uart or something stupid like that. It's pretty much any run-off-the-mill AVR will be doing a better job at doing anything electronics-related, and it will be faster, too.
[QUOTE=DrDevil;43322408]Do yourself a favour and buy a microcontroller. The RPi's GPIO is really quite shite to say the least, and without some software effort, you won't be able to directly drive a typical lcd-display, but rather only one that comes with an i2c, spi or uart backpack.
I still wonder about the purpose of the RPi in the electronics domain. Most people seem to abuse it as a microcontroller, just to slap a microcontroller on top of the GPIO header and then control some pins via uart or something stupid like that. It's pretty much any run-off-the-mill AVR will be doing a better job at doing anything electronics-related, and it will be faster, too.[/QUOTE]
Budget media server is about the best application I can think that isn't done by something else
[QUOTE=metallics;43322428]Budget media server is about the best application I can think that isn't done by something else[/QUOTE]
Well, the original intention was to create a cheap computer everyone can afford, so everybody can learn programming. This goal they definitely achieved. The GPIO header was pretty much just a secondary feature on the board, which is definitely good enough to hook up some LEDs to create some sort of indicator, but beyond that it's useless.
I use mine to learn the basics of EE and Python, so there is that.
It is a great tool for beginners, hence the big deal with educational facilities and everything.
[QUOTE=nutcake;43323134]I use mine to learn the basics of EE and Python, so there is that.
It is a great tool for beginners, hence the big deal with educational facilities and everything.[/QUOTE]
For programming and computing maybe, bit for EE you'd be better off with an avr I think.
[QUOTE=DrDevil;43322516]Well, the original intention was to create a cheap computer everyone can afford, so everybody can learn programming. This goal they definitely achieved. The GPIO header was pretty much just a secondary feature on the board, which is definitely good enough to hook up some LEDs to create some sort of indicator, but beyond that it's useless.[/QUOTE]
I tend to see it as high level computer with low level peripherals essentially a cheaper BeagleBone. Once you get the I2C/SPI interfaces up, its great for mobile applications (i.e. My IEEE robotics team is using an RPi to do mobile image processing while it communicates with an arduino mega as the misc eyes/ears/motor driver)
[QUOTE=LoneWolf_Recon;43324079]I tend to see it as high level computer with low level peripherals essentially a cheaper BeagleBone. Once you get the I2C/SPI interfaces up, its great for mobile applications (i.e. My IEEE robotics team is using an RPi to do mobile image processing while it communicates with an arduino mega as the misc eyes/ears/motor driver)[/QUOTE]
Speaking of processing I believe someone (xilinx possibly?) recently made an FPGA add on for the rpi which is pretty cool, although I didn't look too closely at the spec and I'm nto sure how much capability you'd get for $30.
The raspberry pi sparked my interest with electronics just by playing with LEDs, buttons etc. Then I moved to Arduino with no regrets. I couldn't do without analog input now.
[QUOTE=metallics;43324134]Speaking of processing I believe someone (xilinx possibly?) recently made an FPGA add on for the rpi which is pretty cool, although I didn't look too closely at the spec and I'm nto sure how much capability you'd get for $30.[/QUOTE]
Could I have a link?
[QUOTE=LoneWolf_Recon;43324242]Could I have a link?[/QUOTE]
I remembered the company wrong, it's here:
[url]http://www.edn-europe.com/en/pif-an-fpga-daughter-card-for-the-raspberry-pi.html?cmp_id=7&news_id=10002558#.Ur2s3_RdU8M[/url]
[url]http://www.bugblat.com/products/pif/[/url]
Looks like a nice cheap introduction to FPGAs
[QUOTE=metallics;43324468]I remembered the company wrong, it's here:
[url]http://www.edn-europe.com/en/pif-an-fpga-daughter-card-for-the-raspberry-pi.html?cmp_id=7&news_id=10002558#.Ur2s3_RdU8M[/url]
[url]http://www.bugblat.com/products/pif/[/url]
Looks like a nice cheap introduction to FPGAs[/QUOTE]
Thank you, that actually looks pretty powerful, the onboard PLLs make me believe this could have some SDR applications.
How to reset the thermal fuse in a battery.
[img]http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/IMG_4844.jpg[/img]
A piece of solder.
[QUOTE=pentium;43330598]How to reset the thermal fuse in a battery.
[img]http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/IMG_4844.jpg[/img]
A piece of solder.[/QUOTE]
Thermal fuses are fairly cheap, why create a minor safety hazard when you can avoid it?
I couldn't source them. The cylindrical ones are far more common than these little ones with the mini heater.
[QUOTE=pentium;43330598]How to reset the thermal fuse in a battery.
[img]http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/IMG_4844.jpg[/img]
A piece of solder.[/QUOTE]
Like wrapping a ceramic household fuse with a single layer of tinfoil because you couldn't be arsed to go-to the hardware store after new ones.
I'm back finally after the local telephone exchange got a bit wet, fucking British weather.
[QUOTE=pentium;43292585]...and there's a problem. :suicide:.[/QUOTE]
Please, go spend 30 bux and get the entire thing made on PCB with proper flat flex connectors so you don't have to manually wire everything, if possible get everything mounted on a PCB, the moment I looked at those images I knew there was going to be problems, wiring anything that dense by hand is asking for trouble, at the very least you should be using sockets.
Cool, it worked.
As I dismantled the pack again I shorted two cells and the fuse reopened. Had to spend another ten minutes trying to solder solder again.
Chryseus: I sorted that out. I was switching into modes the board wasn't designed for because the version of the utility I was playing with at the time was for a different PCB layout. Things cleared up when I installed the proper version and it was telling me correct switch settings for both modes. Managed to get a few chips burned before the end of the week. Apple II now has scsi, woo~
I ran into another issue with data corruption but that turned out to be me forgetting a switch combination. I did however find one of my 2732's to be bad.
So nice to get a finished PCB you designed.
[thumb]http://u.cubeupload.com/Chryseus/JIgrB0.jpg[/thumb]
I have a spare if anyone wants.
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