I2C_DS1624

DS1624 Demonstration

About

This is a demonstration of a Python script interfacing with an I²C temperature sensor device connected to a Raspberry Pi.

Devices

The Maxim DS1624 is a digital thermometer with the following pin assignments to the Raspberry Pi:

• SDA/SCL > connected to the I2C#_SDA and I2C#_SCL (respectively)
  • on the Raspberry Pi 1, pins 3 and 5 are wired to I2C0_SDA and I2C0_SCL
  • on the Raspberry Pi 2 and 3, pins 3 and 5 are wired to I2C1_SDA and I2C1_SCL
  • the Adafruit libraries is smart enough to detect the Raspberry Pi variant, and use the appropriate I²C bus
• A0/A1/A2 > connected to GND (I²C address set to 0x48)

Libraries

• Adafruit_Python_PureIO - provides low-level ioctl-based access to the I²C bus on the Raspberry Pi
• Adafruit_Python_GPIO - provides a flexible wrapper around RPi.GPIO and bus interfaces on the Raspberry Pi

Prerequisites

• Image an SD card using the latest Raspbian Jessie Lite release (https://www.raspberrypi.org/downloads/raspbian)
• Download the following dependencies using APT:
  • i2c-tools - provides user-mode tools for interacting with the I²C bus
• Use raspi-config to do the following:
  • Expand the filesystem to occupy the entire SD card
  • Enable the I²C bus kernel module on startup