After several months of "Out of Stock", DS1307 RTC module has experienced a huge upgrade. It comes with a Gravity IIC interface.Its size is also reduced to fit miniaturization application. Gravity I2C DS1307 RTC module is a easy-to-use Real Time Clock module. It is cheap and affordable in most applications such as time clock, data logger, etc. The new version DS1307 RTC module adopts high precision crystal oscillator which reduces time error dramatically. The test conducted shows the time error is only about 1 second in 24 hours (the average time error of Mechanical Watches is about 20s). The module is powered by single cell CR1220 (service life: 3~5 years). It is smaller and keeps EEPROM 4KB ROM to record information related to alarm clocks and events. Besides, you can set the IIC address by resistance adjustment. The Gravity DS1307 RTC module uses Gravity I2C interface and you can plug it on the DFRobot Gravity IO expansion shield directly. Cooperate with Arduino DS1307 library developed by DFRobot, it is easy to realize functions like setting time and time display. It can be widely used in DA (Data Acquisition).

Note: According to the latest Air Transport Regulations, the batteries, magnets and liquids transport will be very stringent, so the cell battery CR1220 will not come with the module any more. Please buy it from the local supermarket.

SPECIFICATION

• Operating voltage: 5V
• Interface: IIC/I2C (Gravity PH2.0-4P Interface & XH2.54 Pins)
• IC Output Data: Hour, Minutes, Seconds, Week, Day, Month, Year
• Leap-year Compensation
• Accurate calendar up to year 2100
• 1Hz Output Pin
• 56 Bytes of Non-volatile memory available to user
• 4KB ROM of EEPROM
• Size: 0.81inch x 1.06inch (22mm x 27mm)
• Weight: 6g

DOCUMENTS

Product wiki
More Documents

SHIPPING LIST

• Gravity: I2C DS1307 RTC Module x1
• Gravity-4Pin I2C/UART Cable x1
• XH2.54-5P Pin Header x1

PROJECTS

Project 1. Hyduino - Automated Hydroponics with an Arduino
hydroponics is growing plants without the use of a traditional dirt medium by using a nutrient rich water solution. This is especially great for those people that that have limited areas in their backyard to grow in.
Hardware list:

• Arduino Mega 2560
• Peristaltic Pumps (2)
• Regular Pump
• pH Electrode Probe and Connection to Arduino pH Up/Down Solution
• 5V Relay Modules for Arduino
• 12V Solenoid Valve
• DHT11 or DHT21 or DHT22 Humidity/Temperature Sensor
• Photosensitive Sensor for Arduino
• Breadboard
• Various Wires
• Grow Lights (mine are LED)
• Sockets for Grow Lights
• 3.2" TFT LCD Shield + Touch Screen (usually has an SD card reader on the back of it)
• Water Level Sensor Float Switch (2)
• I2C RTC DS1307 AT24C32 Real Time Clock Module
• 9V and 12V Power Supplies
• Hydroponics Pots (I'm using 10 - 3" pots for this)
• 1" PVC Pipe and Fittings + Drain Pipe and Fittings