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Powering Hexy
IMPORTANT NOTICE: The voltage limits are printed onto the Servotor32 board (4.8v-7v). The logic power supply is only rated up to 10v, but nothing above 9v is recommended. Please be mindful of these limits and do not exceed them.
For practical reasons (cost and durability), it is best to use rechargeable batteries. Hexy can use a lot of batteries! The Arcbotics team recommend the Powerex 2700mAh Rechargeable Batteries.
The Arcbotics team are investigating different external power supply options but have not made any formal recommendations.
If you're powering Hexy off of battery power only (Say, running it on bluetooth), Hexy can sometimes start to move, then suddenly lose all servo power, then reset and begin this cycle all over again. This is caused by the voltage 'dipping' too low. When the servos move, they draw power from the batteries and thus lowering the battery voltage. If this voltage goes too low the Servotor32, Hexy's 'brain', doesn't get enough voltage to keep going and resets. The reset causes the servos to stop getting signals, stop moving, and the voltage goes back up enough to let the controller boot up. But as soon as Hexy starts moving again, the voltage dips, and it starts all over again.
The fix is to power the brain from an extra power source, one that will have a high enough voltage that in case the battery dips too low, it has a backup supply to keep going. This can be seen as the 'logic' power supply port on the controller. a 4xAA, 5xAA or 9v battery pack plugged into this port will work, and keep hexy going no matter how low the servo voltage dips. The USB power supplied when plugged into a computer works as well, and this problem won't occur when Hexy is plugged in.