Keyestudio ESP32 - 6. Knowledge Expansion

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ESP32 Starter Kit

6. Knowledge Expansion

Let’s make a rangeﬁnder.

We display characters on LCD 1602. Program to show “Keyestudio” at (3,0) and “distance:” at (0,1) followed by the

distance value at (9,1).

When the value is smaller than 100(or 10), a residue of the third(or the second) bit still exists. Therefore, an “if”

judgement is necessary to determine a certain condition.

Wiring Diagram

Code

keyestudio ESP32 Inventor Learning Kit

Project 25.2Ultrasonic Rangefinder

http://www.keyestudio.com

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2); //set the LCD address to 0x27 for a 16 chars and 2␣

˓→line display

int distance = 0; //Define a variable to receive the diatance value

int EchoPin = 14; //Connect Echo pin to io14

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138 Chapter 8. Arduino Tutorial