DFRobot/pxt-DFRobot_MaqueenPlus_v20

Ultrasonic sensor error 914

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I have noticed that there is an issue when using the HC-SR04 ultrasonic sensor. The board just outputs a sad face and the error code 914. I have tried a different implementation of reading the sensor (Makerbit) and it works. I also tested with different setups (different boards, sensors and robots) all with the same result.