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Asked — Edited

Sharp IR On Car Robot, Table Top Robot Avoids Falling Off

anyone know how to write this code in java?

:loop
adc_wait(adc0,lower,160)
stop()
reverse(200,500)
sleep(50)
left(255,500)
stop()
forward()
sleep(50)
goto(loop)


now it starts, avoids falling off table, turns left, keeps going - cheers!
All figured out below, I solved it below with help of thetechguru


thanks


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Synthiam
PRO
Portugal
#24  
What is a the diference between "Sharp Infrared Proximity Distance Sensor" and "Sharp IR distance sensor"?
PRO
USA
#25  
From what I read,

the Sharp IR Analog Distance Sensor (6.99_ detects (avoids) objects in front of  the robot, I have this,  works well,

I going to try The Sharp Proximity Distance Sensor (9.98) to detect more of a depth proximity


I will receive this Sunday and test and let you know,
PRO
Synthiam
#26  
I think the distance sensors don’t work well with close objects, specifically edge detection. 

the proximity detector is designed for close contact and edge detection.
PRO
USA
#27  
proteusy,

received the Sharp proximity sensor, did the test,

much better results, responds very different
PRO
Portugal
#28  
What is the reference of those sensores? Can you post a pic?
Thanks
PRO
Synthiam
#29  
The ones I’ve used require a two resistors and they’re tiny and super cheap. Look like this 

User-inserted image



but you can get ones that have a pcb with the wiring all ready for you. Maybe like this from Amazon 

User-inserted image
PRO
Portugal
#30  
Oh yes, i know those sensors. Thanks.
PRO
USA
#31   — Edited
proteusy

This is the Sharp proximity sensor, not the distance sensor

works well for me

Here are 2 pics:

User-inserted image


User-inserted image
PRO
Synthiam
#32  
In my experience, the sensor that ezang just posted isn't great for edge detection. They have difficulty with close objects and prefer a distance of 10+ cm away.
PRO
Portugal
#33  
Yep, that seems to be the Sharp GP2Y0A21YK0F sensor. It works from 10 to 80cm.
PRO
USA
#34   — Edited
Sharp GP2Y0A21YK0F GP2Y0A21 10~80cm Infrared Proximity Distance Sensor

 is enough for a table top car  :-)

You always can get the Infrared Proximity Sensor Long Range - Sharp GP2Y0A02YK0F  19.95


the Description: Infrared proximity sensor made by Sharp. Part # GP2Y0A02YK0F has an analog output that varies from 2.8V at 15cm to 0.4V at 150cm with a supply voltage between 4.5 and 5.5VDC. The sensor has a Japanese Solderless Terminal (JST) Connector. We recommend purchasing the related pigtail below or soldering wires directly to the back of the module.
#35  
I have used those Sharp sensors too, and they do a pretty good job.
#36  
I've used the same Sharp sensors for years and have have had good results with them for edge and line detection.
PRO
USA
#37  
Hi JustinRatliff, nice to see you again,

what script do you use ior edge detection?

I have one but it may not be as good as you ,  thanks
PRO
USA
#38   — Edited
On my big robot I use 5 of this:

Sharp GP2Y0A51SK0F Analog Distance Sensor 2-15cm
https://www.pololu.com/product/2450

Similar to the GP2Y0A21YK0F but a shorter range 2-15cm.

Cliff detection:
User-inserted image
#39  
@PTP   I like how small those are.  The GP2Y0A21YK0F work fine if the drop-off you are worried about is high enough.  The step I am avoiding is well over 10cm, so I just watch for an increase from unmeasurably small to measurable, but for future builds I think I'll get the Pololu ones.
PRO
USA
#40   — Edited
This is why I use the Sharp GP2Y0A21YK0F GP2Y0A21 10~80cm Infrared Proximity Distance Sensor

not the Sharp Infrared Distance Sensor

PtP what script do you use for the sensors?
PRO
USA
#41   — Edited
I purchased some of the IR Infrared Obstacle Avoidance Sensor Modules 7.99  for 10 units

will test soon, hope they work

User-inserted image
PRO
Synthiam
#42  
I'm curious how those will work - without any rear reflector housing on the emitter or detector... will be interesting to see.
PRO
USA
#43   — Edited
This is just to avoid obstacles