circuit

ImplFerris · Oct 27, 2024 · 25f2fce · 25f2fce
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diff --git a/src/ultrasonic/action.md b/src/ultrasonic/action.md
@@ -31,7 +31,7 @@ let pwm = &mut pwm_slices.pwm6;  // Access PWM slice 6
 pwm.set_ph_correct();            // Set phase-correct mode for smoother transitions
 pwm.enable();                    // Enable the PWM slice
 let led = &mut pwm.channel_b; // Select PWM channel B
-led.output_to(pins.gpio13);   // Set GPIO 13 as the PWM output pin
+led.output_to(pins.gpio3);   // Set GPIO 3 as the PWM output pin
 ```
 
 ## Setup the Trigger Pin

diff --git a/src/ultrasonic/assets/pico-ultrasonic-led.jpg b/src/ultrasonic/assets/pico-ultrasonic-led.jpg
diff --git a/src/ultrasonic/index.md b/src/ultrasonic/index.md
@@ -24,4 +24,6 @@ The HC-SR04 Sensor module has a transmitter and receiver. The module has Trigger
 - **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.
-- **LED**: Connect the anode (long leg) of the LED to GPIO 13, as in the [External LED setup](../blinky/external-led.md).
+- **LED**: Connect the anode (long leg) of the LED to GPIO 3, as in the [External LED setup](../blinky/external-led.md).
+
+<a href="./assets/pico-ultrasonic-led.jpg"><img style="display: block; margin: auto;" alt="pico2" src="./assets/pico-ultrasonic-led.jpg"/></a>