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16  Topics / Robotics / Re: programming walking gait for hexapod on: February 03, 2012, 07:15:23 am
I would suspect a forward gate would be something like this (sudo code):

give legs lay out of:
3  6
2  5
1  4

raise legs 1, 3, 5
move legs 1, 3, 5 "forward" & legs 2, 4, 6 "backwards"
lower legs 1, 3, 5
raise legs 2, 4, 6
move legs 1, 3, 5 "backwards" & legs 2, 4, 6 "forward"
lower legs 2, 4, 6
repeat
17  Using Arduino / Sensors / Re: Problem with 2 Sharp GP2D12 IR sensors on: February 02, 2012, 02:47:23 pm
make sure you serial monitor shows the same bit rate as you initialize your serial to in your code.
18  Using Arduino / Sensors / Re: Parallax Ping with Arduino Uno on: February 02, 2012, 08:41:52 am
http://tronixstuff.wordpress.com/2011/11/28/tutorial-parallax-ping-ultrasonic-sensor/

http://www.arduino.cc/playground/Main/UltrasonicSensor
19  Using Arduino / Sensors / Re: analogRead() returning no 0 on: January 31, 2012, 03:20:03 pm
the input is floating (definition of nothing connected) therefore does not have a defined voltage applied to it.
20  Using Arduino / Programming Questions / Re: Uploading to Uno board on: January 31, 2012, 11:19:31 am
what error message are you getting?
21  Using Arduino / Sensors / Re: MLX90614 distance on: January 13, 2012, 08:53:32 am
http://www.melexis.com/Assets/IR-sensor-thermometer-MLX90614-Datasheet-5152.aspx -> download the data sheet
pages 33 to 36 has some information about the field of "vision" of the sensor. 
Page 40 has some information that looks relevant to your question.
page 43 - 44 has some information that looks relevant to your question.
22  Topics / Robotics / Re: can anyone help me with prgraming the DFRobot 4WD Arduino Mobile Platform? on: January 09, 2012, 07:34:04 am
Green Motor
  • Gear Ratio 1:120
  • No-load speed(3V):100RPM
  • No-load speed(6V):200RPM
  • No-load current(3V):60mA
  • No-load current(6V):71mA
  • Stall current(3V):260mA
  • Stall current(6V):470mA
  • Torgue (3V): 1.2Kgcm
  • Torque (6V): 1.92Kgcm
  • Size: 55mm x 48.3mm x 23mm
  • Weight:45g

Yellow Motor
  • Motor Model: 130 Motor
  • Output Mode: Two-way shaft output
  • Gear ratio: 1:120
  • No-load speed (3V): 90RPM
  • No-load speed (6V): 180RPM
  • No load current (3V): 120mA
  • No load current (6V): 160mA
  • Locked-rotor current (3V): 1.5A
  • Locked-rotor current (6V): 2.8A
  • Size: Long 55MM W 48.3MM high-23MM
  • Weight: About 45g
23  Using Arduino / Motors, Mechanics, and Power / Re: Voltage Drop across H-Bridge on: January 05, 2012, 03:11:26 pm
I found the answer to question 1:

Looks like the reverse voltage protection diode is typically rated around 1A - so less then my stall current of my 2 motors, so I need to do separate Vin for the shield.

24  Using Arduino / Motors, Mechanics, and Power / Voltage Drop across H-Bridge on: January 05, 2012, 02:20:22 pm
I am using the flowing shield: http://mcukits.com/2009/03/12/assembling-the-freeduino-arduino-motor-shield/
Which uses the following H-Bridge: http://www.makingthings.com/resources/datasheets/SN754410NE_slrs007b.pdf

I have a few questions before I put the kit together as I might need to invert the Vin header to supply a different Vin for the board then the Arduino.

1) what is the maximum current that I can safely pull from vin header when the Arduino is supplied by the barrel jack (want to make sure I don't burn traces on the board)?

2) From the data sheet, it looks like the motor voltage is likely to be around ~2 volts less then the drive supply voltage (page 4, High-level output voltage & Low-level output voltage).  However it is rated at 1A continuous and max dissipation of 2075 mW, which would only allow 0.5 A continues per channel at a 2 volt per channel drop.  Am I miss reading one of the specifications?
25  Using Arduino / Sensors / Re: Softpot membrane potentiometer on: January 04, 2012, 02:57:07 pm
http://arduino.cc/en/Tutorial/AnalogInOutSerial

as the code sends the analog information to the serial port (viewable via the serial monitor), you don't need to connect the LED
26  Topics / Robotics / Re: Traxxas E-revo robot projekt (remove failsafe?) on: December 30, 2011, 05:02:07 pm
is this what is happening: http://traxxas.com/support/Traxxas-Speed-Controls-and-Low-Voltage-Detection-LVD
27  Topics / Robotics / Re: Traxxas E-revo robot projekt (remove failsafe?) on: December 30, 2011, 02:34:36 pm
You probably don't want to remove the failsafe as it is a failsafe, instead you should figure out what is triggering it.

lets start with some questions to see if we can gather the needed information to assist:

1) what is the code you are running on the arduino?

2) Please supply a link to a specification sheet for the Electronic Speed Controller you are using so we can compare your code to the specs.
28  Using Arduino / Networking, Protocols, and Devices / Re: Wireless Range and bps on: December 30, 2011, 11:11:02 am
look into signal modulation if you want to understand the hows and whys.
29  Using Arduino / Project Guidance / Re: Detecting audio frequency (notes) on: December 29, 2011, 11:05:44 pm
look into Fast Fourier Transform - it might help with what you are looking for.
30  Using Arduino / Storage / Re: Are there examples of EEPROM wear-leveling algorithms for storing a queue? on: December 29, 2011, 10:56:02 pm
[quoteActually since all entries are time/date stamped the API on the web server ignores duplicates so resending the anchor entry when the queue is empty is not a bad thing.  This version also more effectively spreads the wear.][/quote]

are you storing the date/time with each sample? if so you could just scan the eeprom for the newest date and then just over write then next, you could then loop through the eeprom and only have one erase/write per data save.
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