Subject:
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Re: Sonar x Batteries
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 6 Jun 2000 19:15:10 GMT
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Reply-To:
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nospam-dcchen@NOSPAMpacbell.net-nospam
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Viewed:
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827 times
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I too noticed that the battery usage went way up. I got around this by
using trains of IR Pulses (like 10 Pulse IR/Check IR level pairs in a
row)
followed by a rest period for let's say 100msec then checking IR again.
This creates a lower (approx 20%) "Duty Cycle" that conserves battery
power.
Doesn't seem to effect range much either. You can play with the
settings to
optimize to your environment.
Dave
Code as follows (in NQC):
DEFINE ONCYCLES 10 <--How many times in a row to Ping for an obstacle
with IR
DEFINE OFFTIME 100 <--How many msec to give it a rest
IR_THRESHOLD 70 <--In Percent mode, your mileage may vary. Adjust
as needed.
task Ping
{
while(true)
{
repeat(ONCYCLES)
{
maxlight = IN_2;
if(maxlight > IR_THRESHOLD)
{
*** DO YOUR COLLISION AVOIDANCE STUFF HERE ***
break;
}
SendMessage(maxlight);
}
Sleep(OFFTIME);
}
}
Mauro Vianna wrote:
>
> Hi, people!
> I built a sonar-like feature as other people here had done already. The
> robot is using the RCX to send IR messages and a light sensor to detect the
> IR reflections. It sends messages continually while moving and detection
> works fine. It works better with red obstacles.
> But it seens that this feature consumes the batteries fast. Can somebody
> confirm that?
> If true, did somebody already use any workaround as an external IR emitter
> connected to external batteries?
>
> Best regards,
>
> Mauro Vianna
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Message is in Reply To:
 | | Sonar x Batteries
|
| Hi, people! I built a sonar-like feature as other people here had done already. The robot is using the RCX to send IR messages and a light sensor to detect the IR reflections. It sends messages continually while moving and detection works fine. It (...) (24 years ago, 4-Jun-00, to lugnet.robotics)
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