Help with ping sensor

Robe

I am trying to run four pings, with my bobat for navegation but
my servos speeds·slow down.· from full speed to slow
could it be batery pawer or code.· if i use only two ping runs ok
all pings are conected to BS2 .
······················ could anyone helpme,·I appreceate the help.


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Jon Williams

The Ping adds delays that may be upsetting your program. Instead of "Pinging" all of them in the same cycle, you might consider doing it in a round-robin fashion so that you don't have to wait so long between updates.

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Jon Williams
Applications Engineer, Parallax

Robe

Thank you Jhon.
when you say round robin fashion how do i do that.
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Robe

Jhon , also on 6/21/05

you send me a image to knock off half a volt fron a 1.5 surce
for a pir sensor

a 10K resistor coming from the PIR sensor to the BS2 then in line another resistor 4.7K
i think it's end is conected to groun is it. but coneted to the PIR ground or the BS2 I not shure

Jon Williams

Each time you go through the main loop you point at a different sensor.· If you're using four, you can do this:

· pingNum = pingNum + 1 // 4

This will keep the value of "pingNum" between 0 and 3.· If you wire your sensors to continguous pins you can call the first PingBase and then do something like this:

Get_Sonar:
· thePing = PingBase + pingNum
· LOW·thePing
· PULSOUT thePing, Trigger
· PULSIN· thePing, IsHigh, rawDist(pingNum)
· rawDist(pingNum) = rawDist(pingNum) */ Scale
· rawDist(pingNum) = rawDist(pingNum) / 2
· RETURN

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Jon Williams
Applications Engineer, Parallax

sam_sam_sam

Jon ( or some else )

" If you wire your sensors to continguous pins you can call the first
( PingBase ) and then do something like this:"
(Is this where you would put " PingBase" pin and # or is it "ThePing" pin #)

Thank You for all of your help in this matter

samsam

Manuel

I want to use this forum only because its alredy done and it tals about the sonar. I have the new sonar with only 1 to pin connection. Is it possible to meassure with decimals by using hundreds?

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Best Regards

Manuel C. Reinhard

Jon Williams

You can, but the device accuracy is not enough to warrant converting to 100ths.

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Jon Williams
Applications Engineer, Parallax

Manuel

But i could have 10´s then, right?

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Best Regards

Manuel C. Reinhard

Jon Williams

You can use any resolution you want, but the accuracy of small sonars like that don't justify anything better than 1 cm.

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Jon Williams
Applications Engineer, Parallax