Error Arduino Pico and DS3231

Projects Programming
1

Hi, someone could tell me if have made the DS3231 RTC work on the Arduino-Pico, I have connected both boards using the I2C bus but I am not getting a response from the RTC, could someone tell me what the problem could be, this is my code:

#include <RTClib.h>
#include <Wire.h>
RTC_DS3231 rtc;
char t[32];

#define Pin_SDA1 4
#define Pin_SCL1 5

void setup() {
  Serial.begin(115200);
  bool setSDA(Pin_SDA1);
  bool setSCL(Pin_SCL1);
  Wire.begin();
  rtc.begin();
  rtc.adjust(DateTime(2024, 6, 1, 5, 31, 45));
}
void loop() {
  DateTime now = rtc.now();
  sprintf(t, "%02d:%02d:%02d %02d/%02d/%02d", now.hour(), now.minute(), now.second(), now.day(), now.month(), now.year());
  Serial.print(F("Date/Time: "));
  Serial.println(t);
  delay(1000);
}
2

Surely this

ought to be this?

   Wire.setSDA(Pin_SDA1):
   Wire.setSCL(Pin_SCL1);
3

Wire.setSDA(Pin_SDA1):
Wire.setSCL(Pin_SCL1);

I have also tried it but the problem is the same

4

And this is usually the point where someone asks to see a schematic.

5

Here is the schematic.

Schematic Pico-DS3231
Schematic Pico-DS32311179×835 179 KB

6

5V to the DS3231, but the Pico is a 3.3V board. Probably not a good idea to be pulling the Pico's output pins up to 5V.

This sketch, uploaded to a Pico with a DS3231 board connected to GP4 & GP5:

#include <RTClib.h>
#include <Wire.h>
RTC_DS3231 rtc;
char t[32];

#define Pin_SDA1 4
#define Pin_SCL1 5

void setup() {
  Serial.begin(115200);
  Wire.setSDA(Pin_SDA1);
  Wire.setSCL(Pin_SCL1);
  Wire.begin();
  rtc.begin();
  rtc.adjust(DateTime(2024, 6, 1, 5, 31, 45));
}
void loop() {
  DateTime now = rtc.now();
  sprintf(t, "%02d:%02d:%02d %02d/%02d/%02d", now.hour(), now.minute(), now.second(), now.day(), now.month(), now.year());
  Serial.print(F("Date/Time: "));
  Serial.println(t);
  delay(1000);
}

with the DS3231 powered by 3.3V rather than 5V, produced this output:

Monitor port settings:
baudrate=115200
Connected to /dev/ttyACM0! Press CTRL-C to exit.
Date/Time: 05:31:59 01/06/2024
Date/Time: 05:32:00 01/06/2024
Date/Time: 05:32:01 01/06/2024
Date/Time: 05:32:02 01/06/2024
Date/Time: 05:32:03 01/06/2024
Date/Time: 05:32:04 01/06/2024
7

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