I tried to use the RTC module with ESP32 and got a little stuck, so I wrote about it. To conclude, I solved the problem by bringing #include DS1307RTC.h to the top. This is the ESP32 version of the ReadTest sample code.
The libraries and equipment used are as follows.
DS1307RTC library github.com/PaulStoffregen/DS1307RTC
HiLetgo 3個セット DS3231 AT24C32 時計モジュール リアル時間時計モジュール IICモジュール RTCモジュール Arduinoに対応 並行輸入品
wiring diagram
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| //Set <DS1307RTC.h> to the top. | |
| //<DS1307RTC.h>を一番上に持ってくる | |
| #include <DS1307RTC.h> | |
| #include <Wire.h> | |
| void setup() { | |
| Serial.begin(115200); | |
| //set SDA and SCL port | |
| //SDA:21 SCL:22 is default | |
| //Some ports can not be used? | |
| //SDAとSCLを設定する。 | |
| //SDA:21 SCL:22がデフォルトらしい | |
| //Wire.begin(SDA,SCL) でSDAとSCLの番号を変える | |
| //動くポート番号と動かないポート番号がある？ | |
| Wire.begin(21,22); | |
| } | |
| void loop() { | |
| tmElements_t tm; | |
| if (RTC.read(tm)) { | |
| Serial.print("Ok, Time = "); | |
| print2digits(tm.Hour); | |
| Serial.write(':'); | |
| print2digits(tm.Minute); | |
| Serial.write(':'); | |
| print2digits(tm.Second); | |
| Serial.print(", Date (D/M/Y) = "); | |
| Serial.print(tm.Day); | |
| Serial.write('/'); | |
| Serial.print(tm.Month); | |
| Serial.write('/'); | |
| Serial.print(tmYearToCalendar(tm.Year)); | |
| Serial.println(); | |
| } else { | |
| if (RTC.chipPresent()) { | |
| Serial.println("The DS1307 is stopped. Please run the SetTime"); | |
| Serial.println("example to initialize the time and begin running."); | |
| Serial.println(); | |
| } else { | |
| Serial.println("DS1307 read error! Please check the circuitry."); | |
| Serial.println(); | |
| } | |
| delay(9000); | |
| } | |
| delay(1000); | |
| } | |
| void print2digits(int number) { | |
| if (number >= 0 && number < 10) { | |
| Serial.write('0'); | |
| } | |
| Serial.print(number); | |
| } |