Interfacing DS1307 RTC With PIC18F46K22 Microcontroller | Electronics Developer
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📌Introduction
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This post shows how to build a simple real time clock/calendar using PIC18F46K22 microcontroller and DS1307 RTC chip where time and date are displayed on 20×4 LCD screen and they could be set using two push buttons connected to the PIC18F46K22 microcontroller.
The compiler used in this project is CCS PIC C.
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📌 Circuit Design
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All grounded terminals are connected together.The two push buttons in the circuit are used to set time and date of the real time clock, button 1 (B1) is connected to RB0 pin (#33) and button 2 (B2) is connected to RB1 pin (#34).
SCL and SDA pins of DS1307 are respectively connected to PIC18F46K22 pins RC3 (#18) and RC4 (#23) which are hardware I2C module pins (MSSP1).
The 20×4 LCD screen is connected to the PIC18F46K22 microcontroller as follows:
RS — RD0 pin
RW — RD1 pin
E — RD2 pin
D4 — RD3 pin
D5 — RD4 pin
D6 — RD5 pin
D7 — RD6 pin
VSS, D0, D1, D2, D3 and K are connected to circuit GND (ground).
VEE to the variable resistor (or potentiometer) output pin.
VDD to +5V and A to +5V through 330 ohm resistor.
VEE pin is used to control the contrast of the LCD. A (anode) and K (cathode) are the back light LED pins.In this project the PIC18F46K22 microcontroller runs with its internal oscillator @ 8 MHz, MCLR pin is configured as an input pin.
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📌 Tags
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#PIC18F46K22#DS1307 #Thermometer
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📌 The Code
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Source code Given In Comment Section , The following C code is for CCS C compiler, it was tested with version 5.051.To be able to compile the C code below, a driver (library) for DS1307 RTC is DS1307.C,
After the download, add it to project folder or CCS C drivers folder (for example C:\Program Files (x86)\CCS\Drivers).I2C Bus (using I2C1 module) is initialized in the code as shown below at clock frequency of 100kHz.
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