» MAKE: NOISE — Discuss this article

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• PDF Board And Schematic
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  I would like to build this, but the .png image of the board isn't very helpful. I think you should make a PDF of the board without the silkscreen part and with the traces in black and no background color and a PDF of the silkscreen layer on it's own. A PDF of the schematic would also be useful.

  Posted by slim16 on April 10, 2010 at 12:02:01 Pacific Time

• PDF Board And Schematic
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  You can generate your own .pdf's from the Eagle files he provided. You can turn on/off whatever layers you want, in order to generate a .pdf that suits your needs.

  Posted by Brrent on May 25, 2010 at 07:20:53 Pacific Time

• PDF Board And Schematic
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  I have a newer version of the Triple8 posted here with a proper Eagle layout and board file with .pdf files and some new code, as this version uses 4 control inputs instead of 2.
  
  ftp://ftp.rediculouslygoodlooking.com/arduino/LawnBot400/MAKE_Lawnbot400/Triple8_v3/

  Posted by johndavid400 on May 25, 2010 at 07:48:56 Pacific Time

• PDF Board And Schematic
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  I like this design better, but I have questions about the parts list. Your earlier parts list spoiled me. Sorry, as you know, no good deed goes unpunished.
  
  What is C5? According to the BOM, it's a resistor, but I highly doubt that. What size & type capacitor would you recommend?
  
  I also assume that you went away from the bussed network resistors entirely, and so both r.x.a and r.x.b are ordinary carbon film axial type resistors -- but what wattage? I just hate to make assumptions.
  
  Finally, the connectors, X1 and X2, appear to be different from the ones on the original BOM -- would you have part numbers or enough that I can order something like?

  Posted by perlcat on June 02, 2010 at 14:21:30 Pacific Time

• PDF Board And Schematic
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  sorry for the added confusion...
  
  You are right - C5 is a bulk capacitor - up to 22.5mm in diameter, can be any value above 600uf - the voltage rating must be 35v or higher, this one would work:
  http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=565-1593-ND
  
  Also, right again - the resistor networks were a bit harder to find, so I re-did the design with standard through-hole resistors. I used 1/8watt (very tiny) but any power rating above that will work (1/4w or 1/2w are fine).
  
  Lastly, I used the same type of connectors for X1 and X2... they are standard .2" spacing screw-terminals. Radio shack sells them here:
  
  http://www.radioshack.com/product/index.jsp?productId=2102861
  
  or Digikey:
  
  http://search.digikey.com/scripts/DkSearch/dksus.dll?WT.z_header=search_go&lang=en&site=us&keywords=ED1975-ND&x=20&y=8

  Posted by johndavid400 on June 07, 2010 at 14:55:59 Pacific Time

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  How much cash should I have set aside for this project?

  Posted by Jay W. on June 06, 2010 at 06:12:29 Pacific Time

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  you should have around $550 set aside for the complete project. If you can find used parts to use (like batteries, motors, wheels, etc..) it will be a bit cheaper.

  Posted by johndavid400 on June 07, 2010 at 14:23:36 Pacific Time

• Cost
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  I managed to pull it off for about $200, minus the lawn mower.. I mounted 8 solenoid driven spray paint cans on the front so i can use it as a sidewalk writer..

  Posted by sindicate on July 21, 2010 at 13:40:06 Pacific Time

• Circuit Board Software
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  I am wondering what you use to upload the programs to the circuit boards. I am not very familiar with this type of stuff. If you know the steps of doing this can you please add them.

  Posted by drdewy on June 06, 2010 at 07:32:46 Pacific Time

• Circuit Board Software
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  You must use the Arduino circuit board (around $25) and the Arduino programming environment (free) from here:
  
  http://arduino.cc
  
  Go to download, choose the package for your Operating System (Windows, Mac, or Linux) and install the program.
  
  Once installed, run the program and open the code file that I provided (ends with .pde). After connecting your Arduino board using a USB cable, press the upload button to transfer the code to your Arduino board.

  Posted by johndavid400 on June 07, 2010 at 14:32:04 Pacific Time

• MOSFETS
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  Would it be possible to use another type of mosfets? For example IRLZ34N (type-N) and IRF5305 (type-P). If so are there any considerations when building the circuits? For instance a change in the resistors?
  
  Thanks

  Posted by kminant on July 09, 2010 at 09:51:27 Pacific Time

• MOSFETS
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  You can substitute other mosfets, but I would make sure they have similar ratings as the ones I used. The P-channel mosfet you chose would not work with the current design, as it only has a Gate-to-Source voltage max of +/-20v. Since the project uses +24v, the power supply would exceed the voltage rating of that mosfet - this is b/c the Gate of this mosfet is pulled up to +24v to turn OFF and GND to turn ON. Also, it has about 3x the resistance (from .026 ohms to .6 ohms) of the original, which means it will transfer far less power before getting hot.
  
  The logic-level N-channel mosfet you chose would work, though it might get hot faster since it has a lower current rating...
  
  

  Posted by johndavid400 on July 12, 2010 at 08:42:10 Pacific Time

• MOSFETS
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  If possible i would stick with the parts the JD specified, i tried a few different Mosfets after i got my first trilp-8 built, just for fun.. I found most of IRZ series heat up much faster the the ones on the original BOM..

  Posted by sindicate on July 21, 2010 at 13:37:56 Pacific Time

• Motors
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  Has anyone had any luck with the wheel char motors for this? I've tried lookind around but there are so many variations it's hard to know which ones will work best. I want to be able to get up hills but I don't want it running around the yard at 20MPH :-)

  Posted by rward06 on July 12, 2010 at 13:53:37 Pacific Time

• Motors
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  I built this whole project, and I couldnt be happier. The motors that i used were from a Quickie P110, mfg'd by Fracmo out of the UK. Most electric wheel chair motors are already geared down to about 5-6 mph max, but with _TONS_ of torque. Watch out for integral electric brakes, mine has them, and i didnt know it till i had it all hooked up. I am in Oregon, and our Goodwills have powerchairs ALL the time...

  Posted by sindicate on July 21, 2010 at 13:36:18 Pacific Time

• Motors
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  I purchased the motors from a guy on Ebay, CCemo. The motors are Everest and Jennings power wheelchair motors. He listed them as having a 2.5 amp no-load current draw at 24v and appx. 500 rpm at the output shaft.
  
  He has been selling these motors for several years off and on - check out his ebay store:
  http://stores.ebay.com/CCE-Motion-Control

  Posted by johndavid400 on December 10, 2010 at 22:34:59 Pacific Time

• Bussed resistors
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  on the H-bridge, I'm a little confused about the 47 Ohm bussed resistors - the exact digikey part number is for a 5 resistor (6 pin) part, while there are only holes in the board for four pins. If I zoom really close on the side view picture of the H bridge, it appears that the last 2 pins are cut off. Am I seeing this right? Would a 4 pin version make more sense? I'm no electronics gugru -am I missing something?
  
  And for the motors - check out Allelectronics.com

  Posted by bengineer on July 22, 2010 at 19:34:58 Pacific Time

• Bussed resistors
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  Yes, you are seeing that right, I kinda tripped on that too. Just snip 2 leads off, all will be well. A 4 gang would work i believe, but i think the 6 gang is more common.

  Posted by sindicate on July 23, 2010 at 09:42:01 Pacific Time

• Bussed resistors
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  Sindicate is right... they do not sell a bussed resistor array with less than 5 resistors in it on Digikey, so I had to use a 5 resistor model and only utilize 3 of the resistors.
  
  I did not realize when I designed that board that other people would be building it later on.... I went back and re-designed the Triple8 (minor adjustments on the layout) and removed the resistor arrays, in favor of regular resistors. It is available here - look for the v3 files:
  ftp://ftp.rediculouslygoodlooking.com/arduino/LawnBot400/MAKE_Lawnbot400/Triple8_v3/

  Posted by johndavid400 on July 23, 2010 at 11:00:02 Pacific Time

• Bussed resistors
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  So what motor did you purchase from allelectronics.com?

  Posted by verbatim5813 on September 21, 2010 at 20:23:17 Pacific Time