Tiny RTC I2C Modules 24C32 Memory DS1307 Clock for Arduino พร้อมถ่าน

โมดูลนาฬิกาตามจริง ใช้ IC DS1307 สามารถแสดงค่าเวลาเป็นแบบ 24 หรือ 12 ชั่วโมง ติดต่อบอร์ด Arduino ผ่าน I2C

Arduino Tiny RTC I2C Real Time Clock

This Arduino Tiny RTC I2C module incorporates the DS1307 I2C real time clock IC and the 24C32 32K I2C EEPROM storage. What's more, it has a DS18B20temperature sensor on board. All of this in a tiny package of 25mm x 28mm x 8.4mm. It comes with a LIR2303 rechargeable lithium battery, and a charging circuit is included in the module. When the temperature sensor is off, the RTC module can run for 1 year on a single charge.

This module is used for applications such as datalogging, timing applications ex. turning on the sprinkers at 4pm in the evenings. Since the module is self powered the time data is maintained even if the Arduino is powered off, allowing for building low power systems which can run for a long span of time without change of batteries.

Specs of DS18B20 Temperature Sensor

• 3.0-5.5V input voltage
• Waterproof
• -55°C to+125°C temperature range
• ±0.5°C accuracy from -10°C to +85°C
• 1 Wire interface

Wiring the RTC to Arduino

The most useful pins are duplicated from P1 to P2. If needed, the pin "BAT" can be fed into an ADC pin for monitoring the battery voltage. The pin-outs are explained below. Connecting "VCC" to 5 V will trickle charge the onboard battery. 

Arduino Tiny RTC I2C Real Time Clock Pinout

The I2C wires "SDA" and "SCL" are the data line and clock line, they should be connected to the corresponding pins depending on the Arduino board.