What is after the first 1. 2. 3. 4. steps ?

Arduino Info USB/FTDI programmer Add libary Remove libary RF transmit / Recive 315 or 433 Mhz CD4051B - 8 port analog multiplexer 74hc595 - 8 port shift register - output 1-Wire ® Temperature (DS18B20) i2c bus + scanner i2c Barometric Pressure + Temp(BMP085) i2c LCD 1602 Display SingleBus Temperature + Humidity(DTH11 + DTH21 + DTH22)

Arduino i2c bus

Here is my i2c bus scanner. You can use it to scan after devices.

I2c bus scan

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I 2 C bus standard rate of 100 kHz
- Only bus capacity limited to 400pF.
- Recommended cables use twisted pair wires.
- You can slow down bus if long wires
i2c bus specification

Board I2C / TWI pins
Pro mini A4 (SDA), A5 (SCL)
Uno, Ethernet A4 (SDA), A5 (SCL)
Mega2560 20 (SDA), 21 (SCL)
Due 20 (SDA), 21 (SCL), SDA1 (SDA), SCL1 (SCL)
Leonardo 2 (SDA), 3 (SCL)