AN899 MICROCHIP PDF

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If low power is detected the red LED will blink, and power will be shut off completely. The controller monitors the speed of one of the motors the one with a optical wheel “chopper” attached to an elongated motor shaft.

Because there is no indication that the motor is moving less than 3mph, if the optical wheel fails for any reason the motorboard will assume that 3mph has not yet been reached. Navigation menu Personal tools Create account Log in.

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PIC18F4331

Views Read View an89 View history. If the speed of this motor is less than 3mph, no power will be provided to the motors. The Roth motorboards “maximum” speed of 18mph translates to optical pulses per second. When you turn the motorboard ON, the green light goes on then off, then the yellow light goes on then off then the red light goes on then off and then the green light goes on solid. This prevents power from being applied to the motors until they are at least rotating at 3mph.

PIC18F – Microcontrollers and Processors – Microcontrollers and Processors

When the battery gets critically low, the RED light will illuminate. When the battery is almost dead, the red light will blink and the buzzer on the motor contoller PCB will beep on and off 1 second on, 4 seconds off until micrpchip battery reaches the low power shut off.

One turn of the wheel is at best inches Privacy policy About Motorboards Disclaimers Mobile view. This saves significant amounts of battery power and prevents the motorboard from starting accidentally. The motorboard will not function and there will be no indication as to the cause of failure.

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The motorboard has an automatic low power shut off. Actually it operates at Hz measured. Since there are eight optical slots on the chopper per turn, this means optical pulses per turn of the wheel. The speed is controlled linearly, and no attempt is made to maintain a given speed for a given throttle position. Then the operator pushes to go.

This page was last modified on 23 Marchat The current code cannot be read because the “Code Protect” bit has been set, but it is possible to erase the chip and program it with new code. The motor makes approximately Retrieved from ” http: