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Reply To: JSN-SR04T waterproof ultrasonic on a Pi 3 gives 0 cm or timeouts for our hostel water tank

Raised it on a 20 cm pipe piece and switched to your gpiozero code. Now steady readings, 43-45 cm when full, no zeros. Alarm rule is set at level_pct < 20 with 3 readings. Warden got his first real warning yesterday at 6 am.

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