HCSR04+

src/ultrasonic/index.md

@@ -18,6 +18,7 @@ The HC-SR04 Sensor module has a transmitter and receiver. The module has Trigger
 
 ## Setup
 - **VCC**: Connect the VCC pin on the HC-SR04 to the 3.3V pin on the Pico to safely power the sensor. Although the HC-SR04 generally operates at 5V, using 3.3V helps protect the Pico, as its GPIO pins are rated for 3.3V. There is some unconfirmed information that the Pico 2 GPIO might tolerate 5V, but for now, this is uncertain. I’ve tested both 3.3V and 5V connections without issues so far 🤞. (If anyone has confirmed details on this, please raise an issue so we can keep this guide accurate.)
+    - Other considerations: Alternatively, you can use HCSR04+ (which can operate at both 3.3v and 5V) or use logic level shifter.
 - **Trig**: Connect to GPIO 17 on the Pico to start the ultrasonic sound pulses.
 - **Echo**: Connect to GPIO 16 on the Pico; this pin sends a pulse when it detects the reflected signal, and the pulse length shows how long the signal took to return.
 - **GND**: Connect to the ground pin on the Pico.