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Home > Education > Modular Robotics Systems > Vex > VEX Parts & Accessories >

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VEX

VEX Micro Controller

Item #: FRS-V-276-2170
Availability: In Stock
  Price: $149.99

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  • VEX Microcontroller
  • Radio controlled + programmable
  • 16 Analog/Digital I/O ports
  • 8 Motor outputs
  • 6 Interupt ports
  • Onboard Serial
  • 10 MIPS PICmicro® PIC18F8520
  • Programmable in 'C'


Inputs and Outputs
Battery input 7.2 volts nominal, 6 to 9 volts min/max input range
Battery Type 6 AA batteries (not included) or VEX Robotics Power Pack
Interrupt inputs 6
Digital I/O 16 max with no Analog, Each can be input or Output     (shared with Analog)
Input Impendence
 Analog/Digital - The input consists of a 470K pull-up to +5V and a series resistance of 1K to the uP.
Interrupts - The input consists of a series resistance of 1K to the uP. More info - input Schematic.
Analog inputs 16 max with no Digital, 10-bit resolution                        (shared with Digital)
Digital/Analog
as inputs		 3 dB bandwidth of 150 kHz, weak pull-up of 470k-ohms to 5.0 volts,
need 0.0 to 0.6 volts for a low and 4.0 to 5.0 volts for a high
Interrupts
as inputs		 3 dB bandwidth of 150 kHz, weak pull-up of 47k-ohms to 5.0 volts,
need 0.0 to 0.6 volts for a low and 4.0 to 5.0 volts for a high
Digital/Analog
Interrupts
as Outputs		 As outputs these ports can drive an open circuit to 0.6v or lower for a low and 4.0 volts or higher for a high.
They can drive a 1 mA load to 1.6v or lower for a low and 3.0 volts or higher for a high.
PWM Outputs
 As outputs these ports can drive an open circuit to 0.6v or lower for a low and 4.0 volts or higher for a high.
They can drive a 1 mA load to 1.0v or lower for a low and 3.6 volts or higher for a high.
Digital input Freq. 50 KHz (typical)
Analog input Access 10 μSec
Motor Output 8 PWM Outputs for motors or servos, refreshed every 18.5mSec
Serial Ports TTL (115Kb) - Serial Port and TX/RX on Digital/Analog port
Pinout Digital/Analog, Interrupts, Motor Outputs: Outside pin (closest to the controller edge) Ground
Digital/Analog, Interrupts: Center pin (or middle pin) + 5 Volts, 1 Amp Max combined total from all pins
Motor Outputs: Center pin (or middle pin) + Battery Power, 4 Amps Max combined total from all pins
Digital/Analog, Interrupts, Motor Outputs: Inside pin (furthest from the controller edge) Signal / Control line

User Programmable Micro-Controller
User Microcontroller Microchip PICmicro® PIC18F8520
Processor Speed 10 MIPS  (Million Instructions Per Second)
Variable Space 1800 bytes + 1024 bytes EE2
Program Space 32K
Programming PIC C
Programming Tools Microchip MPLAB IDE or easyC
Erase/Write Cycles 100,000
Data Retention > 40 years

General Features
Size (W x L x H) 4.5" x 3.9" x 1.1"
Weight 0.28 lbs.
Battery 7.2V Rechargeable Nickel Cadmium batteries - NiCd
Charging Recharge when battery voltage < 7.1V, full charge 7.8V typical
Battery 7.2V Rechargeable Nickel Cadmium batteries - NiCd
Current Draw 62 mA - Controller & Receiver min, 5mA to 2A per Motor, 20mA to 1.5 A per Servo