Home Code Using the DS3231 on the Pioneer600 with the Raspberry Pi

Using the DS3231 on the Pioneer600 with the Raspberry Pi

by shedboy71

The Raspberry Pi doesn’t have an RTC chip on it but with an expansion board you can add this

A popular chip is the DS3231 , lets have a quick look at this chip

DS3231 Information

I used a Pioneer600 board which has one of these chips on it among other features

Parts

The Pioneer600 costs around $39 for many useful features

Name Link
Raspberry Pi 4 Aliexpress product link

Amazon. com link

Ebay search

Raspberry Pi Expansion Board Pioneer600 Aliexpress product link

Amazon link

Ebay link

DS3231 Examples

C example using the  BCM library

#include <bcm2835.h>  
#include <stdio.h>
#include <unistd.h>
 
//regaddr,seconds,minutes,hours,weekdays,days,months,yeas
char  buf[]={0x00,0x00,0x22,0x06,0x27,0x12,0x19};
char  *str[]  ={"SUN","Mon","Tues","Wed","Thur","Fri","Sat"};
void pcf8563SetTime()
{
	bcm2835_i2c_write(buf,8);
}
 
void pcf8563ReadTime() 
{   
	buf[0] = 0x00;  
    bcm2835_i2c_write_read_rs(buf ,1, buf,7);  
} 
 
int main(int argc, char **argv)  
{  
	if (!bcm2835_init())return 1;  
   	bcm2835_i2c_begin();  
    bcm2835_i2c_setSlaveAddress(0x68);  
    bcm2835_i2c_set_baudrate(10000);  
    printf("DS3231 Test Program ...\n\n"); 
 
    pcf8563SetTime(); 
    while(1)  
    {  
       	pcf8563ReadTime();
		buf[0] = buf[0]&0x7F; //sec
		buf[1] = buf[1]&0x7F; //min
		buf[2] = buf[2]&0x3F; //hour
		buf[3] = buf[3]&0x07; //week
		buf[4] = buf[4]&0x3F; //day
		buf[5] = buf[5]&0x1F; //mouth
		//year/month/day
		printf("20%02x/%02x/%02x  ",buf[6],buf[5],buf[4]);
		//hour:minute/second
		printf("%02x:%02x:%02x  ",buf[2],buf[1],buf[0]);
		//weekday
		printf("%s\n",str[(unsigned char)buf[3]]);
		bcm2835_delay(1000); 
	}  
 
	bcm2835_i2c_end();  
   	bcm2835_close();  
 
    return 0;  
}

Save the file as “ds3231.c”. Compile and run with:

gcc -Wall ds3231.c -o ds3231-lbcm2835
sudo ./ds3231

Python example

#!/usr/bin/python
# -*- coding: utf-8 -*-
import smbus
import time
 
address = 0x68
register = 0x00
#sec min hour week day mout year
NowTime = [0x00,0x00,0x22,0x06,0x27,0x12,0x19]
w  = ["SUN","Mon","Tues","Wed","Thur","Fri","Sat"];
#/dev/i2c-1
bus = smbus.SMBus(1)
def ds3231SetTime():
	bus.write_i2c_block_data(address,register,NowTime)
 
def ds3231ReadTime():
	return bus.read_i2c_block_data(address,register,7);
 
ds3231SetTime()
while 1:
	t = ds3231ReadTime()
	t[0] = t[0]&0x7F  #sec
	t[1] = t[1]&0x7F  #min
	t[2] = t[2]&0x3F  #hour
	t[3] = t[3]&0x07  #week
	t[4] = t[4]&0x3F  #day
	t[5] = t[5]&0x1F  #mouth
	print("20%x/%02x/%02x %02x:%02x:%02x %s" %(t[6],t[5],t[4],t[2],t[1],t[0],w[t[3]-1]))
	time.sleep(1)

Save the file as “ds3231.py” and execute it with:

sudo python ds3231.py

C example using  WiringPi

#include <wiringPi.h>
#include <wiringPiI2C.h>  
#include <stdio.h>
 
#define DS3231_Address 0x68
//seconds,minutes,hours,weekdays,days,months,yeas
char  buf[]={0x00,0x00,0x22,0x06,0x27,0x12,0x19};
char  *str[]  ={"SUN","Mon","Tues","Wed","Thur","Fri","Sat"};
int fd,i;
 
void pcf8563SetTime()
{
	for(i = 0;i < 7;i++)
	{
		wiringPiI2CWriteReg8(fd,i,buf[i]);
	}
}
 
void pcf8563ReadTime() 
{   
	for(i = 0;i < 7;i++)
	{
		buf[i] = (char)wiringPiI2CReadReg8(fd,i);
	}
} 
 
int main(int argc, char **argv)  
{  
	if(wiringPiSetup() < 0)return 1;  
   	fd = wiringPiI2CSetup(DS3231_Address);
    printf("DS3231 Test Program ...\n\n"); 
 
    pcf8563SetTime(); 
    while(1)  
    {  
       	pcf8563ReadTime();
		buf[0] = buf[0]&0x7F; //sec
		buf[1] = buf[1]&0x7F; //min
		buf[2] = buf[2]&0x3F; //hour
		buf[3] = buf[3]&0x07; //week
		buf[4] = buf[4]&0x3F; //day
		buf[5] = buf[5]&0x1F; //mouth
		//year/month/day
		printf("20%02x/%02x/%02x  ",buf[6],buf[5],buf[4]);
		//hour:minute/second
		printf("%02x:%02x:%02x  ",buf[2],buf[1],buf[0]);
		//weekday
		printf("%s\n",str[(unsigned char)buf[3]]);
		delay(1000); 
	} 
    return 0;  
}

Save the file as “ds3231.c”. Compile and run with:

gcc -Wall ds3231.c -o ds3231-lbcm2835 -lwiringPi
sudo ./ds3231

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