Added final C++ example

examples/servo2040/CMakeLists.txt

@@ -3,6 +3,7 @@ include(servo2040_current_meter.cmake)
 include(servo2040_led_rainbow.cmake)
 include(servo2040_multiple_servos.cmake)
 include(servo2040_read_sensors.cmake)
+include(servo2040_sensor_feedback.cmake)
 include(servo2040_servo_cluster.cmake)
 include(servo2040_servo_wave.cmake)
 include(servo2040_simple_easing.cmake)

examples/servo2040/servo2040_sensor_feedback.cmake

@@ -0,0 +1,16 @@
+set(OUTPUT_NAME servo2040_sensor_feedback)
+add_executable(${OUTPUT_NAME} servo2040_sensor_feedback.cpp)
+
+target_link_libraries(${OUTPUT_NAME}
+        pico_stdlib
+        servo2040
+        analogmux
+        analog
+        button
+        )
+
+# enable usb output, disable uart output (so it doesn't confuse any connected servos)
+pico_enable_stdio_usb(${OUTPUT_NAME} 1)
+pico_enable_stdio_uart(${OUTPUT_NAME} 0)
+
+pico_add_extra_outputs(${OUTPUT_NAME})

examples/servo2040/servo2040_sensor_feedback.cpp

@@ -0,0 +1,74 @@
+#include <cstdio>
+#include "pico/stdlib.h"
+
+#include "servo2040.hpp"
+#include "analogmux.hpp"
+#include "analog.hpp"
+#include "button.hpp"
+
+/*
+Show how to read the 6 external sensors and
+display their values on the neighbouring LEDs.
+
+Press "Boot" to exit the program.
+*/
+
+using namespace plasma;
+using namespace servo;
+
+// The brightness of the LEDs
+constexpr float BRIGHTNESS = 0.4f;
+
+// How many times to update LEDs and Servos per second
+const uint UPDATES = 50;
+
+// Set up the shared analog inputs
+Analog sen_adc = Analog(servo2040::SHARED_ADC);
+
+// Set up the analog multiplexer, including the pin for controlling pull-up/pull-down
+AnalogMux mux = AnalogMux(servo2040::ADC_ADDR_0, servo2040::ADC_ADDR_1, servo2040::ADC_ADDR_2,
+                          PIN_UNUSED, servo2040::SHARED_ADC);
+
+// Create the LED bar, using PIO 1 and State Machine 0
+WS2812 led_bar = WS2812(servo2040::NUM_LEDS, pio1, 0, servo2040::LED_DATA);
+
+// Create the user button
+Button user_sw(servo2040::USER_SW);
+
+
+int main() {
+  stdio_init_all();
+
+  // Set up the sensor addresses with pull downs
+  for(auto i = 0u; i < servo2040::NUM_SENSORS; i++) {
+    mux.configure_pulls(servo2040::SENSOR_1_ADDR + i, false, true);
+  }
+
+  // Start updating the LED bar
+  led_bar.start();
+
+  // Read sensors until the user button is pressed
+  while(!user_sw.raw()) {
+
+    // Read each sensor in turn and print its voltage
+    for(auto i = 0u; i < servo2040::NUM_SENSORS; i++) {
+      mux.select(servo2040::SENSOR_1_ADDR + i);
+      float sensor_voltage = sen_adc.read_voltage();
+
+      // Calculate the LED's hue, with Green for high voltages and Blue for low
+      float hue = (2.0f - (sensor_voltage / 3.3f)) * 0.333f;
+      led_bar.set_hsv(i, hue, 1.0f, BRIGHTNESS);
+
+      printf("S%d = %f,", i + 1, sensor_voltage);
+    }
+    printf("\n");
+
+    sleep_ms(1000 / UPDATES);
+  }
+
+  // Turn off the LED bar
+  led_bar.clear();
+
+  // Sleep a short time so the clear takes effect
+  sleep_ms(100);
+}