This is a simple example. It just combines the DS1302 time module and the 1602 LCD. By the way, it uses the large LCD font we talked about before to make a pretty beautiful Arduino clock, which is very suitable for beginners to practice.
The official website has organized kits, you can refer to them:
Please first install the Rtc by Makuna time module library and LiquidCrystal_PCF8574 display library, which can be found in the Arduino IDE.
Wiring is not difficult, DS1302 has 3 signal lines, which can be modified from the program. 1602 is the I2C interface, SDA is connected to A4, and SCL is connected to A5. Everyone should be familiar with it.
Jason added a small change to the program. In addition to displaying hours and minutes, he also added PM or AM in front. It is actually very simple. If it is judged after 12 o’clock, PM will be displayed, otherwise AM will be displayed.
There are many function libraries for DS1302. Jason prefers to use the Rtc by Makuna time module library. The time setting method used in the examples provided is fully automatic, and the compiled time is automatically obtained for comparison with DS1302. , DS1302 will be updated if the time is slow. We do not need to manually key it, which is very convenient for beginners.
Video of the entire Process
#include <Wire.h>
#include <LiquidCrystal_PCF8574.h>
#include <ThreeWire.h>
#include <RtcDS1302.h>
// DS1302 wiring instructions: can be modified according to needs
// DS1302 CLK/SCLK --> 10
// DS1302 DAT/IO --> 9
// DS1302 RST/CE --> 8
// DS1302 VCC --> 3.3v - 5v
// DS1302 GND --> GND
ThreeWire myWire(9, 10, 8); // IO, SCLK, CE
RtcDS1302<ThreeWire> Rtc(myWire);
LiquidCrystal_PCF8574 lcd(0x3F); //Set the i2c address, generally there are two types: 0x27 and 0x3F
//The following are the settings for large fonts
//Number font settings
const char custom[][8] PROGMEM = { // Custom character definitions
{ 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x00, 0x00, 0x00 }, // char 1
{ 0x18, 0x1C, 0x1E, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F }, // char 2
{ 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x0F, 0x07, 0x03 }, // char 3
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x1F, 0x1F }, // char 4
{ 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1E, 0x1C, 0x18 }, // char 5
{ 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x00, 0x1F, 0x1F }, // char 6
{ 0x1F, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x1F, 0x1F }, // char 7
{ 0x03, 0x07, 0x0F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F } // char 8
};
//Settings of text and symbols
const char bigChars[][8] PROGMEM = {
{ 0x20, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // Space
{ 0xFF, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // !
{ 0x05, 0x05, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00 }, // "
{ 0x04, 0xFF, 0x04, 0xFF, 0x04, 0x01, 0xFF, 0x01 }, // #
{ 0x08, 0xFF, 0x06, 0x07, 0xFF, 0x05, 0x00, 0x00 }, // $
{ 0x01, 0x20, 0x04, 0x01, 0x04, 0x01, 0x20, 0x04 }, // %
{ 0x08, 0x06, 0x02, 0x20, 0x03, 0x07, 0x02, 0x04 }, // &
{ 0x05, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // '
{ 0x08, 0x01, 0x03, 0x04, 0x00, 0x00, 0x00, 0x00 }, // (
{ 0x01, 0x02, 0x04, 0x05, 0x00, 0x00, 0x00, 0x00 }, // )
{ 0x01, 0x04, 0x04, 0x01, 0x04, 0x01, 0x01, 0x04 }, // *
{ 0x04, 0xFF, 0x04, 0x01, 0xFF, 0x01, 0x00, 0x00 }, // +
{ 0x20, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, //
{ 0x04, 0x04, 0x04, 0x20, 0x20, 0x20, 0x00, 0x00 }, // -
{ 0x20, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // .
{ 0x20, 0x20, 0x04, 0x01, 0x04, 0x01, 0x20, 0x20 }, // /
{ 0x08, 0x01, 0x02, 0x03, 0x04, 0x05, 0x00, 0x00 }, // 0
{ 0x01, 0x02, 0x20, 0x04, 0xFF, 0x04, 0x00, 0x00 }, // 1
{ 0x06, 0x06, 0x02, 0xFF, 0x07, 0x07, 0x00, 0x00 }, // 2
{ 0x01, 0x06, 0x02, 0x04, 0x07, 0x05, 0x00, 0x00 }, // 3
{ 0x03, 0x04, 0xFF, 0x20, 0x20, 0xFF, 0x00, 0x00 }, // 4
{ 0xFF, 0x06, 0x06, 0x07, 0x07, 0x05, 0x00, 0x00 }, // 5
{ 0x08, 0x06, 0x06, 0x03, 0x07, 0x05, 0x00, 0x00 }, // 6
{ 0x01, 0x01, 0x02, 0x20, 0x08, 0x20, 0x00, 0x00 }, // 7
{ 0x08, 0x06, 0x02, 0x03, 0x07, 0x05, 0x00, 0x00 }, // 8
{ 0x08, 0x06, 0x02, 0x07, 0x07, 0x05, 0x00, 0x00 }, // 9
{ 0xA5, 0xA5, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // :
{ 0x04, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // ;
{ 0x20, 0x04, 0x01, 0x01, 0x01, 0x04, 0x00, 0x00 }, // <
{ 0x04, 0x04, 0x04, 0x01, 0x01, 0x01, 0x00, 0x00 }, // =
{ 0x01, 0x04, 0x20, 0x04, 0x01, 0x01, 0x00, 0x00 }, // >
{ 0x01, 0x06, 0x02, 0x20, 0x07, 0x20, 0x00, 0x00 }, // ?
{ 0x08, 0x06, 0x02, 0x03, 0x04, 0x04, 0x00, 0x00 }, // @
{ 0x08, 0x06, 0x02, 0xFF, 0x20, 0xFF, 0x00, 0x00 }, // A
{ 0xFF, 0x06, 0x05, 0xFF, 0x07, 0x02, 0x00, 0x00 }, // B
{ 0x08, 0x01, 0x01, 0x03, 0x04, 0x04, 0x00, 0x00 }, // C
{ 0xFF, 0x01, 0x02, 0xFF, 0x04, 0x05, 0x00, 0x00 }, // D
{ 0xFF, 0x06, 0x06, 0xFF, 0x07, 0x07, 0x00, 0x00 }, // E
{ 0xFF, 0x06, 0x06, 0xFF, 0x20, 0x20, 0x00, 0x00 }, // F
{ 0x08, 0x01, 0x01, 0x03, 0x04, 0x02, 0x00, 0x00 }, // G
{ 0xFF, 0x04, 0xFF, 0xFF, 0x20, 0xFF, 0x00, 0x00 }, // H
{ 0x01, 0xFF, 0x01, 0x04, 0xFF, 0x04, 0x00, 0x00 }, // I
{ 0x20, 0x20, 0xFF, 0x04, 0x04, 0x05, 0x00, 0x00 }, // J
{ 0xFF, 0x04, 0x05, 0xFF, 0x20, 0x02, 0x00, 0x00 }, // K
{ 0xFF, 0x20, 0x20, 0xFF, 0x04, 0x04, 0x00, 0x00 }, // L
{ 0x08, 0x03, 0x05, 0x02, 0xFF, 0x20, 0x20, 0xFF }, // M
{ 0xFF, 0x02, 0x20, 0xFF, 0xFF, 0x20, 0x03, 0xFF }, // N
{ 0x08, 0x01, 0x02, 0x03, 0x04, 0x05, 0x00, 0x00 }, // 0
{ 0x08, 0x06, 0x02, 0xFF, 0x20, 0x20, 0x00, 0x00 }, // P
{ 0x08, 0x01, 0x02, 0x20, 0x03, 0x04, 0xFF, 0x04 }, // Q
{ 0xFF, 0x06, 0x02, 0xFF, 0x20, 0x02, 0x00, 0x00 }, // R
{ 0x08, 0x06, 0x06, 0x07, 0x07, 0x05, 0x00, 0x00 }, // S
{ 0x01, 0xFF, 0x01, 0x20, 0xFF, 0x20, 0x00, 0x00 }, // T
{ 0xFF, 0x20, 0xFF, 0x03, 0x04, 0x05, 0x00, 0x00 }, // U
{ 0x03, 0x20, 0x20, 0x05, 0x20, 0x02, 0x08, 0x20 }, // V
{ 0xFF, 0x20, 0x20, 0xFF, 0x03, 0x08, 0x02, 0x05 }, // W
{ 0x03, 0x04, 0x05, 0x08, 0x20, 0x02, 0x00, 0x00 }, // X
{ 0x03, 0x04, 0x05, 0x20, 0xFF, 0x20, 0x00, 0x00 }, // Y
{ 0x01, 0x06, 0x05, 0x08, 0x07, 0x04, 0x00, 0x00 }, // Z
{ 0xFF, 0x01, 0xFF, 0x04, 0x00, 0x00, 0x00, 0x00 }, // [
{ 0x01, 0x04, 0x20, 0x20, 0x20, 0x20, 0x01, 0x04 }, // Backslash
{ 0x01, 0xFF, 0x04, 0xFF, 0x00, 0x00, 0x00, 0x00 }, // ]
{ 0x08, 0x02, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00 }, // ^
{ 0x20, 0x20, 0x20, 0x04, 0x04, 0x04, 0x00, 0x00 } // _
};
byte col, row, nb = 0, bc = 0; // general
//int bb[8]; // If there is an error in compilation, please use this line
bytebb[8];
void setup()
{
Serial.begin(96
}
