This is the SMD RGB LED Common Cathode Module, These module has 3 separate LEDs the Red, Green and Blue which can be individually driven by applying a voltage to the appropriate module pin this example code is uses the Arduino analogWrite(PWM) function to cycle through the full possible output colors this smd led module is capable of producing a rainbow color scheme.

DS1307 RTC REAL TIME CLOCK MODULE which adopts the I2C protocol to communicate with SCM, and there was this kind of interface on Arduino, therefore is very convenient to link with each other. DS1307 has a programmable waveforms output, it can be used to drive LED lights, or trigger a certain event as a break-off, but be careful when you use it to take some kind of high-power module. We design the real clock module to pin out the I2C interface of Ds1307 and programmable waveforms output interface SQW are connected, but usually, we will only use the I2C interface to realize the basic set of the clock/read function. Note, that this module must be installed on the battery and can work normally. The battery is button batteries (type CR2032 will be better), the positive upward:

• The real-time clock counts minutes, seconds, date, hours, month day of the week, year and leap-year compensation upto 2100.
• 318 temporary data storage RAM
• Working current of 2.0V, less than 300nA
• Read / Write clock or RAM data with two kinds of mode of single-byte transfer mode and multi-byte character set
• 8 pin DIP package or optional 8 pin SOIC package based on the surface assembly
• Simple 3 wire interface
• Compatible with TTL Vcc=5V
• Double power supply pipe for main power and backup power supply.

• Working voltage: 5V
• Pulses per 360-degree revolution: 20
• Push button shaft On/Off switch
• Threaded shaft for panel mounting, also 2 mounting screw holes on the circuit board
• Standard “D” shaft, you can purchase knobs to give it a finished look

• Support Micro SD Card (<=2G), Micro SDHC card (<=32G) (high-speed card)
• The level conversion circuit board that can interface level is 5V or 3.3V\
• Power supply is 4.5V ~ 5.5V, 3.3V voltage regulator circuit board
• Communication interface is a standard SPI interface
• 4 M2 screw positioning holes for easy installation
• Size: 4.1 x 2.4cm

• Operating Voltage: 5V
• Backlight and Contrast is adjusted by potentiometer
• Serial I2C control of LCD display using PCF8574
• Come with 2 IIC interface, which can be connected by Dupont Line or IIC dedicated cable
• Compatible for 16×2 LCD
• This is another great IIC/I2C/TWI/SPI Serial Interface
• With this I2C interface module, you will be able to realize data display via only 2 wires.

4 Bits TM1637 Digital Tube LED 7 Segments Display Module is a 12-pin display module with a 4-point common digital tube (0.36 inch) with a clock point. The driver chip is TM1637. It only needs 2 signal lines to enable the MCU to control the 4-bit 8- Segment digital tube.

1. Detectable sound signal size
2. Built-in filter-rectifier circuit, DC signal output
3. Good sensitivity, built-in amplifier circuit, adjustable gain
4. Voltage signal for sound intensity can be obtained by AD conversion
5. Analog voltage signal output, signal amplitude VCC/2
6. Compatible for Arduino sensor interface.