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 Robotics / Handy Board / 8391
8390  |  8392
Subject: 
Need help with bumpers connected to the HB
Newsgroups: 
lugnet.robotics.handyboard
Date: 
Wed, 23 May 2001 18:29:07 GMT
Viewed: 
1595 times
  
Hi, I’ve got a problem in getting started with the Handy Board. I’d like to
connect a bumper detection circuit to the analog0 of my HB. But when I
connect the bumper circuit to my HB , the HB turns itself off. Can anybody
help me? Any help would be really appreciated!

I’ve taken the circuit  from the book “Mobile Robots: Inspiration to
Implantation”(Loseph L. Jones, Anita Flynn). For somebody who hasn’t got
this book I tried  to describe as well as possible this circuit.

Bumper circuit description:

From +5V to Gnd are 3 resistances (2.2K ; 1.2K ; 1.2K) connected in series.
Two of  three 47K resistances are wired from the nodes between the three
resistances to the 5V pin of each micro-switch. One 47K is from the node
between the 2,2K to +5V.

Each mico-switch is wired up like this:
(the left side is where the lever is fasted to the plastic case)

left pin  to signal
middle pin to Gnd
right pin to  47K resictance (to +5V)


Thanks and best regards,
Jan



Message has 1 Reply:
  Re: Need help with bumpers connected to the HB
 
Hello, Can you describe more about "HB turns itself off ?" Does the HB reset itself? The analog inputs for HB have pull-up resistors. This pull-up resistor may cause the problem. Thanks. Patrick Hui (URL) Original Message ----- From: "Haberlag" (...) (24 years ago, 23-May-01, to lugnet.robotics.handyboard)

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