88 lines
2.9 KiB
TypeScript
88 lines
2.9 KiB
TypeScript
enum ChassisProperty {
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//% block="wheel radius (cm)"
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WheelRadius,
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//% block="base length (cm)"
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BaseLength
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}
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namespace chassis {
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/**
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* A differential drive robot
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*/
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//% fixedInstances
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export class Chassis {
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// the motor pair
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public motors: motors.SynchedMotorPair;
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// the radius of the wheel (cm)
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public wheelRadius: number;
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// the distance between the wheels (cm)
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public baseLength: number;
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constructor() {
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this.motors = motors.largeBC;
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this.wheelRadius = 3;
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this.baseLength = 12;
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}
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/**
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* Makes a differential drive robot move with a given speed (cm/s) and rotation rate (deg/s)
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* using a unicycle model.
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* @param speed speed of the center point between motors, eg: 10
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* @param rotationSpeed rotation of the robot around the center point, eg: 30
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* @param value the amount of movement, eg: 2
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* @param unit
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*/
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//% blockId=motorDrive block="drive %chassis|at %speed|cm/s|turning %rotationSpeed|deg/s"
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//% inlineInputMode=inline
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//% weight=95 blockGap=8
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drive(speed: number, rotationSpeed: number, value: number = 0, unit: MoveUnit = MoveUnit.MilliSeconds) {
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// speed is expressed in %
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const R = this.wheelRadius; // cm
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const L = this.baseLength; // cm
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const PI = 3.14;
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const maxw = 170 / 60 * 2 * PI; // rad / s
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const maxv = maxw * R; // cm / s
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// speed is cm / s
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const v = speed; // cm / s
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const w = rotationSpeed / 360 * 2 * PI; // rad / s
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const vr = (2 * v + w * L) / (2 * R); // rad / s
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const vl = (2 * v - w * L) / (2 * R); // rad / s
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const sr = vr / maxw * 100; // %
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const sl = vl / maxw * 100; // %
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this.motors.tank(sr, sl, value, unit)
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}
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/**
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* Sets a property of the robot
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* @param property the property to set
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* @param value the value to set
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*/
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//% blockId=chassisSetProperty block="set %chassis|%property|to %value"
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//% blockGap=8
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//% weight=10
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setProperty(property: ChassisProperty, value: number) {
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switch (property) {
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case ChassisProperty.WheelRadius:
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this.wheelRadius = Math.max(0.1, value); break;
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case ChassisProperty.BaseLength:
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this.baseLength = Math.max(0.1, value); break;
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}
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}
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/**
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* Sets the motors used by the chassis, default is B+C
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* @param motors
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*/
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//% blockId=chassisSetMotors block="set %chassis|motors to %motors"
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//% weight=10
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setMotors(motors: motors.SynchedMotorPair) {
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this.motors = motors;
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}
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}
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//% fixedInstance whenUsed
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export const chassis = new Chassis();
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} |