Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: santiago on January 30, 2009, 01:36:18 PM

Title: bot help
Post by: santiago on January 30, 2009, 01:36:18 PM

I build the headbot from the "junkbots,bugbots & bots on wheels"book, but it only seems to work
when i touch the power or enable line of the circuit with my finger, Why?

Why is it that If i touch the enable or ground connection it works but if i dont touch it, it doesnt?

Title: Re: bot help
Post by: pomprocker on January 30, 2009, 01:53:12 PM

I don't have the book otherwise I might be able to help. Do they have the plans for this online anywhere?


Maybe, its not grounded to the battery and your body is acting as a common ground? Not sure

Title: Re: bot help
Post by: santiago on January 30, 2009, 03:02:01 PM

I dont have a pic of the schematic. If someone does can you please uploaded.

Title: Re: bot help
Post by: HDL_CinC_Dragon on January 30, 2009, 03:07:03 PM

Is it a circuit that you have to solder yourself? If so then chances are you have a bad connection somewhere

Title: Re: bot help
Post by: santiago on January 30, 2009, 04:11:03 PM

yes it is a circuit you have to soder.

Title: Re: bot help
Post by: fuzzyt on January 30, 2009, 11:01:43 PM

I have the book but haven't built the headbot.  Seeing as the entire circuit is built in classic beam deadbug style, I suspect you may have a bad solder joint.  I would gently test with a multimeter.

Title: Re: bot help
Post by: galannthegreat on January 30, 2009, 11:29:43 PM

in my own experiences i had a problem with bridged connections, so check how it is all connected with a multimeter with continuity.

PS
also check if your photodiodes are oriented

Title: Re: bot help
Post by: HDL_CinC_Dragon on January 31, 2009, 01:25:25 PM

I probably should have asked another question here too >_<

Define "works". Does it only turn on when you jostle the power line? or does it just not move around and stuff?
Perhaps you could give a specific breakdown of whats happening?

Title: Re: bot help
Post by: Admin on February 07, 2009, 11:21:48 AM

http://www.societyofrobots.com/robot_faq.shtml#circuit_debug