Ultrasonice Sensor Schematics

Hi there,

I tried finding the electrical schematics for the PING))) and HC-SR04 ultrasonic sensors (the schematics of the boards themselves, not just wiring to an Arduino) but I couldn't locate any. Can anyone point me in the right direction?

Thanks!

I just put "HC-SR04 schematic" into Google, and got results.
What did you do wrong?

Oh, haha, I only googled "ping))) schematic" and "ultrasonic sensor schematic". Not sure why I didn't try the HC-SR04, thanks!

Schematics, timing diagrams, and code for the HC-SR04: https://uglyduck.ath.cx/ep/archive/2014/01/Making_a_better_HC_SR04_Echo_Locator.html