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void refresh_readings() {
  float f_temperature;
  float f_humidity;
  float f_pressure;
  float f_altitude;

  digitalWrite(LED_PIN, HIGH);

  postCounter++; // New post, increase the post counter

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/*  05. Arduino button oscilloscope demo sketch 
 * 
 * Use this sketch to see a button press as a waveform event in the
 * oscilloscope.
 * 
 * Connect CHA of the oscilloscope to the button signal pin.
 * 
 * Connect CHB to the anode of an LED.
 * 
 * Set the scope to 5us time scale and 200mV voltage scale.

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/*  06. Ultrasonic distance sensor HC-SR04 demo sketch 
 * 
 * This sketch calculates the distance between the HC-SR04 sensor and
 * an object directly infront of it.
 * 
 * To see the trigger and echo waveforms with your oscilloscope,
 * connect CHA to the trigger and CHB to the echo pins.
 * 
 * Set up edge trigger to CHA, and set it to 1V (or there about).
 * 

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/*  07. Arduino PWM oscilloscope demo sketch 
 * 
 * Use this sketch to experiment with the measurement of a PWM waveform
 * on an oscilloscope.
 * 
 * Connect CHA of the oscilloscope to the anode of the LED.
 * 
 * Use a potentiometer to control the duty cycle.
 * 
 * Set triggering to Auto, and start the experiment.

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/*  08. Arduino servo control oscilloscope demo sketch 
 * 
 * Use this sketch to experiment with the measurement of a PWM waveform
 * used to control a servo motor on an oscilloscope.
 * 
 * Connect CH1 of the oscilloscope to pin 9 that controls the servo.
 * 
 * Use a potentiometer to control the duty cycle and therefore the position of the
 * servo.
 * 

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// With this program, you can use the ESP32 as an ultra-low cost signal generator.
// To learn more, see https://techexplorations.com/courses/oscilloscopes/

#include <Arduino.h>
#include "waveforms.h"

int i = 0;
int sample_delay = 0;
const byte POT_GPIO = 35; // Potentiometer
int   t_sample;

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/*  11.1. Arduino UART receive integer oscilloscope demo sketch 
 * 
 * Use this sketch to experiment with the decoding of a single  
 * integer in simplex on an oscilloscope.
 * 
 * Connect CH1 of the oscilloscope to pin 0 of the Arduino.
 * Connect CH2 of the oscilloscope to pin 1 of the Arduino.
 * 
 * 
 * This sketch was written for Oscilloscopes for Busy People by Peter Dalmaris.

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/*  11.2. Arduino UART receive/transmit ASCII character and decode with an oscilloscope demo sketch 
 * 
 * Use this sketch to experiment with the decoding of an ASCII character
 * that is received and transmitted by an Arduino on an oscilloscope.
 * 
 * Use in tandem with the matching Processing sketch
 * 
 * Connect CH1 of the oscilloscope to pin 0 of the Arduino.
 * Connect CH2 of the oscilloscope to pin 1 of the Arduino.
 * 

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/*  11.3. Arduino UART receive/transmit a packet and decode with an oscilloscope demo sketch 
 * 
 * Use this sketch to experiment with the decoding of a multi-byte packet
 * that is received and transmitted by an Arduino on an oscilloscope.
 * 
 * Use in tandem with the matching Processing sketch
 * 
 * Connect CH1 of the oscilloscope to pin 0 of the Arduino.
 * Connect CH2 of the oscilloscope to pin 1 of the Arduino.
 * 

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/*  11. Arduino with BME280 I2C example sketch
 * 
 * Use this sketch to experiment with the decoding of I2C communication on an oscilloscope.
 * 
 * Connect CH1 of the oscilloscope to SCL.
 * Connect CH2 of the oscilloscope to SDA.
 * 
 * 
 * This sketch was written for Oscilloscopes for Busy People by Peter Dalmaris.
 * Find out more at https://techexplorations.com/courses/oscilloscopes/