The Analog-to-Digital converters ADS1115 are connected to the I2C bus of the Raspberry PI. The ADC is fed from 3.3V, the clock is driven by the I2C-Master (Raspberry) with 2MHz. It is as simple as 4 wires only
- GND (ground, 0V)
- SCL (serial clock, driven by the I2C-Master)
- SDA (serial data, bidirectional)
The pull-up resistory (pullups) are internally enabled, so there is no need for external components.
note: 30.11.2015: Be careful! The pinout in the drawing is flipped vertically compared to the photo of the Raspberry.