Merge pull request #54 from makeabilitylab/tone-esp32

Tone esp32

Author: jonfroehlich

esp32/assets/images/ESP32_CompilerError_ToneNotDeclaredInThisScope.png

@@ -1,6 +1,6 @@
 ---
 layout: default
-title: L5: Capacitive touch sensing
+title: L6: Capacitive touch sensing
 parent: ESP32
 has_toc: true # (on by default)
 usemathjax: true
@@ -124,6 +124,7 @@ We also created two touch sensing examples using interrupts: [TouchInterrupt](ht
 In the [next lesson](iot.md), we will connect our ESP32 to the cloud over WiFi and use an IoT dashboard to view our data.
 
 <span class="fs-6">
-[Previous: Analog input using the ESP32](pot-fade.md){: .btn .btn-outline }
+<!-- [Previous: Analog input using the ESP32](pot-fade.md){: .btn .btn-outline } -->
+[Previous: Playing tones](tone.md){: .btn .btn-outline }
 [Next: Making an IoT device](iot.md){: .btn .btn-outline }
 </span>

esp32/capacitive-touch-sensing.md

@@ -37,10 +37,14 @@ In this [lesson](led-fade.md), you'll learn how to use PWM output on the ESP32 t
 
 In this [lesson](pot-fade.md), you'll learn how to use analog input on the ESP32 by building a potentiometer-based LED fader.
 
-## [Lesson 5: Capacitive Touch Sensing](capacitive-touch-sensing.md)
+## [Lesson 5: Playing Tones](tone.md)
+
+ Arduino's [`tone()`](https://www.arduino.cc/reference/en/language/functions/advanced-io/tone/) method is not supported on the ESP32. In this [lesson](tone.md), you'll learn how to play tones using the `ledcWriteTone` and `ledcWriteNote` in [esp32-hal-ledc.c](https://github.com/espressif/arduino-esp32/blob/master/cores/esp32/esp32-hal-ledc.c).
+
+## [Lesson 6: Capacitive Touch Sensing](capacitive-touch-sensing.md)
 
 The ESP32 has built-in circuitry and software for capacitive touch sensing ([docs](https://github.com/espressif/esp-iot-solution/blob/master/documents/touch_pad_solution/touch_sensor_design_en.md#1-introduction-to-touch-sensor-system)). In [this lesson](capacitive-touch-sensing.md), we’ll use the touch sensing functionality to turn on an LED.
 
-## [Lesson 6: Internet of Things](iot.md)
+## [Lesson 7: Internet of Things](iot.md)
 
 The ESP32 is exciting not just because of its speed, memory, and GPIO capabilities but also because it is truly a modern Internet of Things (IoT) board with Wi-Fi and Bluetooth support. In this lesson, we'll learn how to use WiFi and the IoT platform [Adafruit IO](https://learn.adafruit.com/welcome-to-adafruit-io) to upload sensor data in real-time.

esp32/index.md

@@ -1,6 +1,6 @@
 ---
 layout: default
-title: L6: Internet of Things
+title: L7: Internet of Things
 parent: ESP32
 has_toc: false # (on by default)
 usemathjax: true

esp32/iot.md

@@ -85,9 +85,12 @@ Here's a workbench video with serial plotter graphing the analog input value fro
 
 ## Next Lesson
 
-In the [next lesson](capacitive-touch-sensing.md), we will learn about and use the ESP32's built-in capacitive touch sensing module.
+In the [next lesson](tone.md), we will learn how to play tones on the ESP32.
+
+<!-- In the [next lesson](capacitive-touch-sensing.md), we will learn about and use the ESP32's built-in capacitive touch sensing module. -->
 
 <span class="fs-6">
 [Previous: Fading an LED with ESP32](led-fade.md){: .btn .btn-outline }
-[Next: Capacitive touch sensing with the ESP32](capacitive-touch-sensing.md){: .btn .btn-outline }
+[Next: Playing tones](tone.md){: .btn .btn-outline }
+<!-- [Next: Capacitive touch sensing with the ESP32](capacitive-touch-sensing.md){: .btn .btn-outline } -->
 </span>