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Fixing #1505: WeDo2 motor power between 0-30ish doesn't power the motor.

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Evelyn Eastmond 2018-10-01 19:25:37 -04:00
parent 7a7134e23c
commit d7440f882d
1 changed files with 10 additions and 2 deletions
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12
src/extensions/scratch3_wedo2/index.js
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@ -226,7 +226,15 @@ class WeDo2Motor {
* @param {int} value - this motor's new power level, in the range [0,100]. * @param {int} value - this motor's new power level, in the range [0,100].
*/ */
set power (value) { set power (value) {
this._power = Math.max(0, Math.min(value, 100)); const p = Math.max(0, Math.min(value, 100));
// Lego Wedo 2.0 hub only turns motors at power range [30 - 100], so
// map value from [0 - 100] to [30 - 100].
if (p === 0) {
this._power = 0;
} else {
const delta = 100 / p;
this._power = 30 + (70 / delta);
}
} }
/** /**
@ -305,7 +313,7 @@ class WeDo2Motor {
*/ */
turnOff (useLimiter = true) { turnOff (useLimiter = true) {
if (this._power === 0) return; if (this._power === 0) return;
const cmd = this._parent.generateOutputCommand( const cmd = this._parent.generateOutputCommand(
this._index + 1, this._index + 1,
WeDo2Command.MOTOR_POWER, WeDo2Command.MOTOR_POWER,