SX28 Proto Board
Roy Carlson
Posts: 46
As a newbie to SX chips. I have the SX28 Proto Board·and some questions that I am sure this group can answer...
1. I saw where you can add a dip socket over the onboard sx chip so that you can use the SX28 dip chip.· How do you disable the onboard chip that is soldered onto the proto board?
2.· Are the 4 - 3 pin servo sections pre-connected to any of the onboard SX chip outputs?
3.· How would you recommend using this proto board and adding female·and/or male headers so that you can use jumper wires to a separate·breadboard?
4. Which clock speed is best for basic I/O operations, such as detecting IFR Leds and Detectors and lighting LEDs?
5. What are the main differences between the SX28 and SX48 boards other the extra I/O's?
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Post Edited (Roy Carlson) : 10/26/2007 2:31:02 PM GMT
1. I saw where you can add a dip socket over the onboard sx chip so that you can use the SX28 dip chip.· How do you disable the onboard chip that is soldered onto the proto board?
2.· Are the 4 - 3 pin servo sections pre-connected to any of the onboard SX chip outputs?
3.· How would you recommend using this proto board and adding female·and/or male headers so that you can use jumper wires to a separate·breadboard?
4. Which clock speed is best for basic I/O operations, such as detecting IFR Leds and Detectors and lighting LEDs?
5. What are the main differences between the SX28 and SX48 boards other the extra I/O's?
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Post Edited (Roy Carlson) : 10/26/2007 2:31:02 PM GMT
Comments
2. According to the schematic (see www.parallax.com/dl/docs/prod/boards/SX28ProtoBDRevBschematic.pdf) there are no port connections.
3. Depends on your gusto - for breadboards, I have prepared a bunch of wires with square pins at both ends, as the breadboards do have female contacts. Therefore, I also prefer female connectors for the SX pins, similar to the Professional Development Board.
4. Again, this depends on your gusto, and the application. When exact timing is not an issue, e.g. for some first "LED-blinker" applications, the internal 4 MHz clock would be fine. When it comes to detect IR LEDs, or to modulating IR transmitters, clock speeds up to 50 MHz might be necessary.
5. The main difference is the chip - the SX48 has 16 more I/O pins but also twice as much program memory, and more variable space.
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Greetings from Germany,
G
Thank you very much.· I have seen your posts and just received your book "Programming the SX Microcontroller" from Parallax.· I just opened the book today.
I am fairly comfortable programming in pbasic and sxbasic (logic progression) and just need to learn more about how the chip structures and byte/bit manipulations can be put to use as detectors and indicators.
My main hobby application is for running my model railroad and learning about electronics and digital logic circuits (just for the knowledge).·
Since I use to program as a hobby back in early 80's I thought I would enjoy learning how to program micros from Parallax.· From what I have seen and experienced, this is the best company for the full support you get at a novice level.
I would like to purchase a good book that focusses mainly on the SX/Basic as well since it would be easier for me to get started.· Do you have any books like this or could you recommend any?
One final request... I saw on your website info about your proto board and/or IC^2 communications.· How can we purchase any of your items?
Roy
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Actually the SX28 protoboard can be used to easily program the SX28 DIP chips. You just need to remove the surface mount SX28 and solder in a 28-pin socket .6 inch socket. The pads are already in place and take care of the difference in the pinouts for the two package styles. With that you can get a 28-pin ZIF socket which is then plugged into the 28-pin socket you've soldered to the board.
There are a couple ways to remove the surface mount SX28 chip. Both of them destroy the chip but you're mainly after the whole board and the chip isn't too expensive if you need to replace it. If you have a sharp exacto blade and a steady hand you can actually cut the leads right at the SX28 package. You need to be extremely careful just to cut the lead and not scratch or cut traces on the PCB. Once this is done the leads will still be on the board. Removing those is easy. You just need some fresh solder. Just run a bunch of fresh solder over the leads and the soldering iron will just wipe them off the board. They usually stick to the sponge and some off when you wipe the iron. Solder wick will clean up any excess solder on the board.
Alternately you can just add a little more solder so you can heat one side with the iron. With that you can pry up on the side your warming to free it from the board. You may then need to use the solder wick to remove some of the excess solder. Repeat on the second side and it's off. Solder wick will then clean up the board.
I've used this to add a 28-pin ZIF to an SX28 protoboard for programming. I've also done this when i've had to replace an SX48 chip. Worked both times....
Good luck,
Robert
thanks for the info about the SX28 proto board. I did not notice that the pads for the DIL package were in place for the SX28AC/DP, so I'm sorry for my mis-leading comment.
Hello Roy,
good to hear that you have got my book, but be warned - it's all Assembly, no BASIC. Nevertheless, it may be helpful when you are looking for information about the internal structure of the SXes, the available flags, how to configure it, etc. You can find a text about SX/B here: http://forums.parallax.com/attachment.php?attachmentid=48274.
No matter if you are using SX/B, or assembly - programming, and discovering the SX is a challenge but also much fun, and you will be amazed what can be done with the SX. You can find a lot of sample code in the download section of the Parallax site www.parallax.com, and at www.sxlist.com.
Regarding my proto boards, and other SX-related parts, please send me a PM (g,daubach@mda-burscheid.de).
Have fun!
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Greetings from Germany,
G
I've found some really good resources on SX Basic right here at the Parallax site if you don't mind electronic document form instead of paper book form. IE; http://forums.parallax.com/attachment.php?attachmentid=47155
The "work in progress" book being worked on by Jon is very promising and goes a long way towards getting comfortable with the SX flavor of basic.
In my opinion, the best resource yet is the "sticky" best SX threads list at the top of this forum.
BTW:
My original interest in electronics.. (OMG... was that really 1974?) stemmed from my desire to automate my model railroad after seeing the layout in the Deutsches Museum in Munich (which incidentally makes any science and technology museum in the USA look tiny by comparison) en.wikipedia.org/wiki/Image[noparse]:D[/noparse]eutsches_museum2.jpg It requires no operators to run many trains at once. It has been doing so since the 1970's if I remember my facts right.
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There's nothing like a new idea and a warm soldering iron.
thank you for correcting my email address - you are right, the comma was a typo, and g.daubach@mda-burscheid.de works a lot better
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Greetings from Germany,
G
guess what... The books finally arrived, so you'll have one soon.
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Greetings from Germany,
G