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Re: Oscilloscope with LED-Matrix?
Ross,
The unit comes assembled and ready to plug into a breadboard. I have one in my hand at the moment. No need for you do anything SMD at all. WOW.? I thought it was a kit.? They even have the Bill-of-Materials as if you should buy the parts you need. Now do I consider getting into AVR system (buying the programmers, etc.)....? I really should.? It is a great uC family. Jong P.S.? If given a choice - is AVR-JTAG superior to ISP - or do they serve different (but overlapping) purpose?? My? understanding is that JTAG can do debugging too but ISP programmers cannot. P.P.S.? Anybody know if the Ebay version of AVR-JTAG is completely compatible with official JTAG connector? [Non-text portions of this message have been removed] |
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Re: Oscilloscope with LED-Matrix?
Jong,
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The unit comes assembled and ready to plug into a breadboard. I have one in my hand at the moment. No need for you do anything SMD at all. Cheers, Ross On 1/02/2011 2:36 PM, jong kung wrote:
If you can go with OLED display, here is one implementation:Very nice. Small enough and cheap enough to put in a circuit during development to double check the signals. |
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Re: Oscilloscope with LED-Matrix?
If you can go with OLED display, here is one implementation: Very nice.? Small enough and cheap enough to put in a circuit during development to double check the signals. Too bad it is SMD.? I've never done SMD and a little afraid of it. I suspect I'm not the only one. Jong [Non-text portions of this message have been removed] |
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Re: USB I/O device
--- In Electronics_101@..., John Eh <jwoolsey@...> wrote:
The mbed uC might be just the perfect solution. It has an RPC (Remote Procedure Call) feature that allows you to declare objects and then control them Richard |
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Help with all the math problems!!
For those of us that fight with the electronics math, here is a link to a great tool. This is Microsoft Mathematics. It is a scientific calculator as well as a full math training tool. It is wonderful. They used to sell it but I discovered the other day that they are giving it away now. Free is gooder than not free. :-) Here's the link.
<> Jim, K6JMG |
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Re: Oscilloscope with LED-Matrix?
I carried a TEK465B all over the country for almost twoairlines and in a car. Terrific scope!!! I need to buy a scrap one tofix up a few things on mine. Believe it or not: it was damaged AFTER Ihad done all that traveling. If I'm not mistaken (again with my famous disclaimer) TEK 465M is the military version (translation: ruggedized for the roughnecks of the military).? So I would think this unit would handle traveling better. Correct me if that is wrong. ===== I once bought a working Tek465 for just $99 (ebay).? I sold it (at same price to my friend) because it was just too confusing for a beginner.? I still have the giant foot mark on? my A$$ as I still kick myself every time I think about that. Jong [Non-text portions of this message have been removed] |
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Re: Oscilloscope with LED-Matrix?
You might be able to find a real portable scope on ebay or similar sites. Unless you really just want the experience. I carried a TEK465B all over the country for almost two decades on airlines and in a car. Terrific scope!!! I need to buy a scrap one to fix up a few things on mine. Believe it or not: it was damaged AFTER I had done all that traveling. Go Figure. If at all possible, get a dual trace scope. I looked at that schematic for the LED scope. Could easily add a second channel if wanted. Anyway, a real scope has so, so many uses.
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Charles AE5EW --- In Electronics_101@..., "Andrewdavid.mathison" <andrewdavid.mathison@...> wrote:
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Re: Selecting microcontroller for hobby projects - opinions wanted.
Hi Andy,
I forgot to mention, although a true RS232 works at +both sides agree, you can also use the protocol at +5 and 0volts....which is where it is before it gets boosted in most computersanyway!! Thanks for that info.? I figured that the input to PicAxe can be internally limited 0 to 3v.? But I never figured that even the PC does that too - which explains how the output to PC works. Max232 manufacturer must be dying of lost profit. ==== Which is why the finished cable only costs 2.50 UKRS232 cable costs only 10 UK Pounds......that is really, reallycheap!!!! I used to have tons of RS232 cables laying around the house (literally all over the house). Now I can't even find a single one when I need it.? I hate paying for stuff I used to have. :-) Jong [Non-text portions of this message have been removed] |
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Re: Selecting microcontroller for hobby projects - opinions wanted.
Andrewdavid.mathison ,
yes you did, but the time I posted (I get the daily summary),I'm just kidding.? Don't take anything I say seriously - especially about being about chopped liver.? I'm really not. ===== I hadn'tread your comments. Someone else also mentioned it too.Happens to me all the time. ==== To my mind, the PICAXEs are still the cheapest andbest chips, especially for a Newbie to cut his teeth on with up to 40MHZversions...... I agree.? Most of us understand that we need various uC for each project.? Even if a EE is Pic fan or AVR fan (or whatever), there are lots of specific model to choose from.? But many of us seems to get all locked into one uC family without consideration the skill level of the newbie. I always liken the uC choice with tricycles and bicycles and motorcycles.? We can't all jump on the fastest motorcycle the very first time we decide to ride.? We need to start with a tricycle (hopefully at young age) - and progress from there.? And most of us never to decide to ride the Kawasaki CrotchRocket 900cc. By the way, no offense to CrotchRocket fans.? I also used to ride Honda 700cc Interceptor - until I got intercepted once too often. ===== Plus there is such a range starting at under $2 each.Tell me about it.? The first time I saw the price, I thought it was misprint or company going out of business.? Certainly cheap enough just to play with even if you (and I) are already into another platform.? And certainly cheap enough for few one-off projects. But almost too cheap that it may not justify the extra shipping and handing cost. How Bizarre. Jong |
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Re: Selecting microcontroller for hobby projects - opinions wanted.
Andrewdavid.mathison
Dear jong kung
I forgot to mention, although a true RS232 works at + and - 12 volts, if both sides agree, you can also use the protocol at +5 and 0 volts....which is where it is before it gets boosted in most computers anyway!! The PICAXE cable shuts a standard RS232 signal down to 0-5 volts for the chip via the two input resistors near to the chip..... Which is why the finished cable only costs 2.50 UK Pounds, the USB to RS232 cable costs only 10 UK Pounds......that is really, really cheap!!!! The chips have always got a pin for RS232 In and one for Out, but you can also use the Out pin for other jobs as well if not needed, via your program...... Greetings from Andy Mathison |
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Re: Selecting microcontroller for hobby projects - opinions wanted.
Andrewdavid.mathison
Dear jong kung
yes you did, but the time I posted (I get the daily summary), I hadn't read your comments. Someone else also mentioned it too. But well done for doing it first. By the way, there are two possible ways to program, RS232 and USB. You just have to buy the right cable.....and they are not expensive either....especially as you could make the RS232 cable yourself if you wished.... To my mind, the PICAXEs are still the cheapest and in most areas, the best chips, especially for a Newbie to cut his teeth on with up to 40MHZ versions......that's not slow even with basic!!! Plus there is such a range starting at under $2 each....what more could anyone ask for......I as good as never need more speed than they can deliver.....I am sure I am not alone. Greetings from Andy Mathison |
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Re: Oscilloscope with LED-Matrix?
On Sun, Jan 30, 2011 at 8:46 PM, Bernab?? <benny7440@...> wrote:
I built one of those Forest Mim's led scopes back in the late 70's. Great learning experience. Probably still have the remains of it laying around somewhere If you can go with OLED display, here is one implementation: Got one. Lot's o' fun. Somewhat on the small size (kinda the idea) But wish I was playing with these before my eyes stated to go. Now, if you want to do something interesting while still sticking to led matrices, use on of those 3d LED cube displays. Be neat to see some waveforms with another axis of data. In color. carl -------------------------------------------------------- [Non-text portions of this message have been removed] |
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Re: Selecting microcontroller for hobby projects - opinions wanted.
James M. \(Jim\) Geidl
Bud,
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Yeah, I have several because of several devices that have the requirement but it isn't something that one is going to really "stock up" on, I don't think. The biggest issue I had was when I added a Win 7 64 bit computer to the mix some of my devices wouldn't work. I had to get some cables with FTDI chips in them rather than Prolific. James "Jim" M. Geidl, K6JMG No trees were harmed in the sending of this message; however, a large number of electrons were terribly inconvenienced. -----Original Message----- |
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Re: Selecting microcontroller for hobby projects - opinions wanted.
--- In Electronics_101@..., "vaclav_sal" <vaclav_sal@...> wrote:
I looked into the idea of voice recognition a couple of years ago and it seemed like Linux had all the packages to make it work. Given that Linux runs on many ARM9 microcontrollers, it should be fairly straightforward to get a "voice knob" working. A Google search for 'linux voice recognition' turns up a lot of material. Richard |
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Re: Selecting microcontroller for hobby projects - opinions wanted.
Jim,
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The "voice knob" project , hope you do not mind if I borrow the title, I like it, is temporary on back burner. The vendor who advertized the "voice recognition chip" turned out not to be interested supporting hobbyist (!) projects, only mass production! I think I will start building it in PC and than "port" it to microprocessor later. BTW I am not to fond ( here I go again! complainig ) of HRD, it only replaces the menu driven stuff (Yaesu 857) with cluttered visual interface. I suppose if you want the "bells and whistles" - log, rotator control, satelite tracting , QRZ access ect ect. it is great. 73 Vaclav AA7EJ
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Re: Oscilloscope with LED-Matrix?
Unless you specifically desire LED display, I would suggest looking into LCD.
I think most Hitachi standard compatible LCD's have a graphic mode available. I feel major advantage of LCD would be hardware "independece" from "1 pixel = 1 LED". For exaple using run of the mill 4 line x 20 character LCD would give you 7x5x4x20 pixels display - assuming 7 by 5 pixels charater size. Just a thought. Vaclav |
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Re: Selecting microcontroller for hobby projects - opinions wanted.
Bud Corazza
Jim,
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Thanks for the tip, but I have the only one that I will ever need (barring failures, accidents, etc.). Bud, KA3UBD ----- Original Message -----
From: "James M. (Jim) Geidl" <jim.geidl@...> To: <Electronics_101@...> Sent: Sunday, January 30, 2011 11:29 PM Subject: RE: [Electronics_101] Re: Selecting microcontroller for hobby projects - opinions wanted. Bud, |
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Re: Selecting microcontroller for hobby projects - opinions wanted.
bruce_fleming
Regarding the requirement of a serial port for some mcu's: Parallax makes a nice affordable usb to RS232 adapter. On the Parallax website, look for "Parallax USB to Serial (RS-232) Adapter" but it is available on other hobby electronics suppliers such as HVW/Solarbotics and probably more if searched.
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It has always worked for me and have heard from others that it works with just about anything with the DB9 connector. --- In Electronics_101@..., jong kung <jongkung01@...> wrote:
everyone seems to have forgotten PICAXE.......I haven't. I mentioned it.? I really am chopped liver around here. |
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Re: Oscilloscope with LED-Matrix?
I liked Popular Electronics. Built one of their VHF receiver kits from scratch back in the late '60s. Tube type. It was a lot of fun.
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Charles AE5EW --- In Electronics_101@..., jong kung <jongkung01@...> wrote:
Digitizing is not the issue. It canHere's the basic design that's running around the web: |
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