PING schematic
quispqix
Posts: 64
Dose anyone have a PING schematic?
I have ultrasonic sensors and I look at the PDF's for the PING and It looks like their are chips behind the PING module.
Is their a compatible circuit I can build?
Plus I posted in the wrong thread, I wanted BASIC Stamps
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Milk, It does a body good!
skype me: quispqix
echolink: 184783 KC0LGV
I have ultrasonic sensors and I look at the PDF's for the PING and It looks like their are chips behind the PING module.
Is their a compatible circuit I can build?
Plus I posted in the wrong thread, I wanted BASIC Stamps
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Milk, It does a body good!
skype me: quispqix
echolink: 184783 KC0LGV
Comments
This has made things take WAY longer than they would any other way, and often resulted in my purchasing the off-the-shelf item in the end anyway. Parallax tends to sell things with some profit margin on them, true, and I don't begrudge them that. But it's not a HUGE profit margin.
Having said that, you should be aware that there do exist other ultra-sonic range-finders. The nice thing about the 'Ping' is that it has a small on-board co-processor, which provides to the BS2 a pulse indicating how long the 'echo' was. And the timing of all this is set up for the relatively slow BS2.
1. Is PING))) using electrostatic transducers or piezo transducers?
2. Why does PING))) need 2 transducers?
3. Where can I buy some CMUTs?
Thanks.
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Even if you had the schematic for the PING))) you wouldn’t be able to build it since the SX chip on board has firmware installed and the chip is not available except installed on the PING))) Module. There are two transducers because one is the transmitter and one is the receiver. It may be that in this design it was easier than trying to switch both circuits. It kind of compares with our RF Transmitter/Receiver. We could have a Transceiver but then we’d have to add a switching circuit. Take care.
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Chris Savage
Parallax Tech Support
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OS-X: because making Unix user-friendly was easier than debugging Windows
links:
My band's website
Our album on the iTunes Music Store
Ultrasonic Homing Device
LIST P=12C672
This article in 'Circuit Cellar' by Tom Baraniak Nov 11, 2000 (or 3-12-2001)
uses a PIC 12C672-04 running at 4 MHz internal clock, All on PDF with the
code for the pic chip included. He goes into the physics of ultrasonics,
pings vs right ear and left ear, shows two transmitter circuits for timing explanation,
and discusses the ping ear placement. The article is heavily mathed to explain the
ping and hearing to distance timing.
www.circuitcellar.com/library/print/1102/baraniak148/index.htm
www.circuitcellar.com/library/print/1102/baraniak148/7.htm
www.circuitcellar.com/library/print/1102/baraniak148/2211014.pdf
Wanna get something done fast, Tell me I can't do it!
Of note I don't know of anyone else found these interesting sites:
www.seattlerobotics.org/
www.seattlerobotics.org/encoder/index.php
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Keeping the price of milk competitive with gasoline!
skype me: quispqix
echolink: 184783 KC0LGV
Post Edited (quispqix) : 7/6/2007 1:32:11 PM GMT
You really are NOT going to get anything "done faster", or "done cheaper". The 'Ping' implements everything that you called out, it's on the shelf today, for less than $40.
But you must do what you think right, of course.
The Circuit Cellar article describes a different device from the PING. The PING has a single receiver and responds to the first echo it receives. The Circuit Cellar device uses two (physically separated) receivers and provides the time difference between the two received signals. If you want something that does what the Circuit Cellar device does, use their design. If you want what the PING does, use that. A Stamp will not be able to do the timing for the Circuit Cellar device. You could use their PIC design and their code or you could modify the design to use an SX or a Propeller which are both capable of doing the timing. Their design is already done, tested, and documented. It's a more complicated than the PING and you'll have to build it from scratch based on their documentation.
·· That is a different product altogether.· We still see the 433 MHz units as 1 Transmitter and 1 Receiver per side.· You'll notice there is a cost difference between the new trasceiver module and the ones we had before.· Take care.
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Chris Savage
Parallax Tech Support