Ultrasonic module us-100, tx: signal input,,, rx: signal output MCU: AT89S52, crystal frequency: 12MHz LCM: 128* 64 LCM Model: QC12864B LCM Interface: 1: GND 2: VCC 3: V0 4.CS 5: SID 6: SCLK 15: PSB 16: NC 17: RST 18: Vout 19: Backlight+ 20: Backlight Function: Ultrasonic Ranging LCD

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