Ping Schematic.

azmax100

Hi all

Where can I get Parallax Ping Sensor Schematic.

GICU812

try the parallax website?

Seriously, go to the store, like you are going to buy a ping they probably have all related litature on the page with the ping.

Chris Savage

Actually the schematic for the PING))) was never published. Take care.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Chris Savage
Parallax Engineering

LoopyByteloose

I presume Chris is referring to the detailed wiring of the device and not the i/o interface and programing of it. I need to locate the latter for a pre-Ping device·as I just mounted mine atop a stepper motor in a retrofit.

The Nuts and Volts articles are a good backup source of old hardware.

There are DIY ultrasonic schematics available via Google if you feel the need to reverse engineer, but the real enhancements are in the transducers. The new ones are much better. Some can read much father and others offer a very narrow focus for accurate work.· The wiring is not really as critical

Try this...
http://www.parallax.com/Portals/0/Downloads/docs/prod/acc/28015-PING-v1.5.pdf

I am pretty sure that Parallax keeps a copy of the supporting document for anything they have sold. It just is good business sense and they are really great people.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
It's sunny and warm here. It is always sunny and warm here.... (unless a typhoon blows through).

Tropically, G. Herzog [noparse][[/noparse] 黃鶴 ] in Taiwan

Post Edited (Kramer) : 9/6/2008 6:25:52 PM GMT

azmax100

Hi Kramer,

I need the schematic. You know why? Because without any knowledge and experience I've take out the RX/TX from the Ping board.
I have to do that for my robotic project. Need to put the RX/TX as the eye of the bot. This is a mistake that heve cost me 40 bugs.Anyhow I learn from mistake.I may buy another Ping or as your suggestion do it my own but I think if I can have the schem maybe I can learn more. I need to know how to connect the RX/TX to the board.

It's good if somebody from parallax can assist me.(maybe Chris)he he. I don't need a full schematic just the part of the RX/TX to the board.

LoopyByteloose

I suspect the Ping is using an SX-20 or SX-28 to generate the sound, receive the sound, and to handle the I/O. The code would be proprietary, but you can look for the microprocessor. It also might be a small PIC.

The reasoning for this is simple. The PING uses one and only one line for input [noparse][[/noparse]RX] and output [noparse][[/noparse]TX]. The easiest way to do this is with an SX or a PIC.

I also suspect that Parallax is not willing to provide the code for any of their in-house products.

So, if you are up to designing from scratch and can write your own code; you can DIY an ultrasonic sensor. I have an old Daventec, not a PING.

By the way, a schematic wouldn't show very much if an SX-28 or PIC is used. Almost all the I/O pins can be assigned the functions in pretty much a random manner and most of the pins are unused. About the only one that might be special is the RTCC pin. It might be used to grab the incoming ultrasonic burst.

I see that Parallax is temporarily out of stock. Maybe they will sell you a replacement processor with code on board. You do the soldering.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
It's sunny and warm here. It is always sunny and warm here.... (unless a typhoon blows through).

Tropically, G. Herzog [noparse][[/noparse] 黃鶴 ] in Taiwan

Post Edited (Kramer) : 9/8/2008 7:17:35 AM GMT

Franklin

If yoiu took out the transmitter and receiver why can't you put them back where you got them? There must be circuits for range finding that you could use to build your own since the ultrasonics are sold alone by several companies.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
- Stephen

LoopyByteloose

I believe he means that he damaged the TX/RX line and is trying to determine how to repair it. The easiest repair would be to replace the chip that it is connected to. But if that chip requires programming, that kind of repair becomes more complex

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
It's sunny and warm here. It is always sunny and warm here.... (unless a typhoon blows through).

Tropically, G. Herzog [noparse][[/noparse] 黃鶴 ] in Taiwan

azmax100

I need to put this thing (see pic) back to the the board and make it funtion. I dont mind if i have to hardwire to the board. Is it so dificult. I belive nothing cant be done but for me as a newbie I need help and guide from the much more experience people in this forum.

Humanoido

I believe you're asking if there's polarity on the two transducers.
The PING))) has a three pin connector with ground, +5 volts and
signal clearly marked on the front of the board. Trace back to
the board holes for the transducer to find which is on the +5 volt
side or ground side. If the PING))) transducer is marked on the
back with + or - or gnd or 5v, you can match the orientation. If
no polarity markings, it should fit in either way. When removing
a component and part during disassembly, you can place a small
pencil mark on the part or use a small dab of colored finger nail
polish to indicate position. You can not only keep track of polarity
but it works well for gear timing and mechanics. The photos
attached in microscope format can be your guide.

humanoido

Post Edited (humanoido) : 9/8/2008 9:39:49 AM GMT

LoopyByteloose

Well, I can clearly see the SX-28 that is driving the whole device. But I seemed to have completely misunderstood the original request. Thanks Humanoido.

Are to two transducers exactly the same or are they in someway different?

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
It's sunny and warm here. It is always sunny and warm here.... (unless a typhoon blows through).

Tropically, G. Herzog [noparse][[/noparse] 黃鶴 ] in Taiwan

azmax100

Thanks Humanoido,
at least you give me some light. Really appreciate it. I'll try to track the circuit.

LoopyByteloose

Try these web pages for some clues. It appears that these transducers are piezoelectric and without polarity.

http://www.discovercircuits.com/DJ-Circuits/40kultrasoundrvr2.htm
http://www.discovercircuits.com/DJ-Circuits/ultra40khzxtr1.htm

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
It's sunny and warm here. It is always sunny and warm here.... (unless a typhoon blows through).

Tropically, G. Herzog [noparse][[/noparse] 黃鶴 ] in Taiwan

LoopyByteloose

And here is a good PDF with fundamental circuits. Again we have transducers that appear to have not polarity, maybe audio speakers.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
It's sunny and warm here. It is always sunny and warm here.... (unless a typhoon blows through).

Tropically, G. Herzog [noparse][[/noparse] 黃鶴 ] in Taiwan

LoopyByteloose

Hi again, this is important information. The attached Murata document shows that the paired transcievers are different units. The Send is marked with an S and the Receive is marked with an R.

Hopefully, you can find obvious markings on the units you have. Google is your friend. If you search that number with Ultrasonic tranciever you are likely to find a specification sheet to help you.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
It's sunny and warm here. It is always sunny and warm here.... (unless a typhoon blows through).

Tropically, G. Herzog [noparse][[/noparse] 黃鶴 ] in Taiwan