Unsigned short read_ds3231(unsigned short address) Sbit Soft_I2C_Sda_Direction at TRISC4_bit Sbit Soft_I2C_Scl_Direction at TRISC3_bit There is no such special difference in reading data from DS3231 compared to DS1307. disp_time(hour,minute,second,day,month,year,temperature) Reading the RTC:Īfter the display function, we need to read the RTC. You can read the previous article to understand this one: Digital Clock with PIC16F676 & Seven Segment DisplayĪfter this function, we can call this display function to print the data on the segments using this command. Here, all 14 sets of data are being transferred. All you see the extra is inside the disp_time() function. These functions are common to the previous one. Void disp_time(int hr, int min, int sec, int day, int month, int year, int temp) Sbit shift_data_Dirrection at TRISB6_bit įor(BitCount=0 BitCount>BitCount)&0x01)!=0) Sbit shift_latch_Dirrection at TRISB7_bit That is why we need 14 sequel clock shifts and one latch clock. We need to drive all the 14 shift registers to show the values on 14 different displays. Shift registers to drive displays:įirst thing first. But don’t worry, I’ll explain them all serially. Programming of our Digital Clock with DS3231 is a little bit extra compared to our previous article. You can use these small SMD versions as the current to drive the LEDs are not high at all but the IC can’t provide current to drive LEDs. The RTC DS3231 is driving 2 LEDs beside its communication through I2C with the MCU. Using a transistor will work too but it will make the circuit like a bird’s nest.īesides the displays, there are 4 buttons for the edit function. If the segment is large, use ULN2003A or ULN2803 drivers. But in practical (PCB) you should use resistors (330R) to drive the seven segments. Here we did not use any resistors between the shift register and seven-segment. Then the data is serially shifted to the right to U17. The data is being sent from the microcontroller to the first shift register U2. All these shift registers are connected in cascade mode. There are 14 shift registers to drive 14 segments. There is no complex part in this circuit.

Rtc ic ds3231 wire library