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Sharp IR Sensor

PICAXE28x1, Sharp IR Sensor and Infrared sensor problems

Hi everyone,


I'm making a robot project for my mechatronics course and I am using picaxe28x1 with an infrared range sensor that I just copied from the Start Here post here at LMR. I did everything, and exactly the same set up like what the guy did. Howeve because we are required to make at least one of our own infrared circuit, I added an infrared sensor (with a transmitter and receiver circuit and a LED indicator) circuit together with the servo and the Sharp IR sensor. I did the set up and wrote my program but it's not doing the job.

IR Sensor Info

IR Sensor Info

IR distance sensor - Sharp GP2YOA21YKOF
This sensor has a range of 10cm - 80cm. Approximately 4" - 32".
The sensor outputs an analog voltage based on the object distance. The
voltage ranges from 3v for a near object to .4v for a distant object.

The IR sensor is mounted on a a servo that sits on the rotating base.
This gives both an X and Y axis movement to the IR sensor. The base
rotation will sweep the sensor back and forth, across the width of the

Obstacle avoidance, education
Using a
I built this super basic robot as a start-here style bot for a presentation I'm doing in a few weeks. I wanted something I could demonstrate building in realtime … Read more

Sharp GP2Y0A21YK0F reads random values.


 I am a newbie to building robots. I am trying to use the sharp GP2Y0A21YK0F IR sensor for reading distance values and I am hitting with two problems.

1. sensor reads very wide range of erratic values.

navigates around house via IR sensor
Using a
I had a Picaxe28 board lying around that i hadn't used and had been wanting to do something similar to the LMR start here bot for awhile now because it seemed to be … Read more

Hello LMR, here's my first blog entry, and my first ever robot...

Hi there. I've been reading LMR for a while, and have just taken a few baby steps on the way to my first robot, so I thought I'd follow the rules and post a blog entry as a start.

I suppose this may be typical - I've spent a lot of time, probably too much time, pondering what I'm going to use. It's pretty clear that I've reached the "analysis paralysis" stage and can probably go on forever, so it's time to get a few things put together and take it from there.

My initial parts list:

IR Sensor Killer

Hi all,


My team is building a competitive robot as part of our course work. As all of us are using the sharp IR sensor, I;m thinking of ways to confuse opponent's readings.


So far, here's the list I've come up with:

1) mirrors to deflect IR--pasting mirror surfaces around robot

2) IR jam--using IR leds to shoot out beams in all directions


I'm thinking of using uneven surfaces that will diffuse the IR beam (not tested yet).


Any suggestions to disrupt the sensors?