YetiBorg not spinning to the right or left.

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Sun, 23 Oct 2016 - 17:05
#1
Yorkshire.Tyke
YetiBorg not spinning to the right or left.

After having built the "YetiBorg" as per the "build instructions" (photos) I wanted to test it. Since I don't have a PS3 game controller I went for using the Sony TV remote control option (buying a "RM-Series Replacement Remote Control For Sony RMT-VB100I"). I have modified the example code "zbRemote.py" to reflect how the motors are connected to the "ZeroBorg". So the arrow keys should give me forwards/backwards and spin left/right movements. Whilst hold the Yetiborg in the air, the wheels spin as expected. But when placed on my carpet, forward/backward movement works but when trying to spin left/right it fails, with the motors seeming to struggle to turn. So thinking the carpet might be the problem I tried it on some lino, little difference. Nb. I'm using a Vapex 280 mAh 9v Ni-MH PP3 battery. Any suggestions?

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Mon, 24 Oct 2016 - 10:22
piborg
piborg's picture
YetiBorg turning

Indeed YetiBorg does not spin properly on carpet, the tyres are too grippy :)
Lino is a bit more surprising, we do not have any around to check with.

What you can do is try over-powering the motors to increase their torque.
This will shorten the lifespan of the motor as well as increasing the speed of the YetiBorg.

I would suggest trying 95% power by altering the script.

First find the Power settings section:

# Power settings
voltageIn = 8.4                         # Total battery voltage to the ZeroBorg (change to 9V if using a non-rechargeable battery)
voltageOut = 6.0                        # Maximum motor voltage

Then change voltageOut to be 95% of voltageIn:

# Power settings
voltageIn = 8.4                         # Total battery voltage to the ZeroBorg (change to 9V if using a non-rechargeable battery)
voltageOut = 8.4 * 0.95                 # Maximum motor voltage

This will probably get the YetiBorg enough grunt to spin on the lino, carpet will still be too much though.

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