I’ve got an HC-SR04 ultrasonic sensor hooked up to a Wireless Stick and it all works fine. However, I’m concerned about the echo pin putting 5v onto the GPIO. The data sheet says the ADC pre-amplifier GPIO are 3.3V tolerant, but which ones are they?
I’ve got the echo on pin 2 - is that ok? Or does the voltage need reducing to 3,3v?
Thanks.
