This page (revision-21) was last changed on 2021-11-21 04:33 by Murray Altheim

This page was created on 2019-12-26 08:51 by Murray Altheim

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I 2 C
I2C

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At line 1 changed one line
__I2C__ is a [hardware] serial interace used across many microprocessors and microcontrollers, including the [Raspberry Pi]. It permits sensors and other IO devices to be connected to the controller (and/or each other) with only four wires (or really only ''two'' if you don't count Vcc and ground):
The __Inter-integrated Circuit (I%%sup 2%%​C) Protocol__ (pronounced ''I-squared-C''
) is a hardware serial interface (or "protocol") intended to allow multiple "slave" components to communicate with one or more "master" components. It used across many microprocessors and microcontrollers, including the [Raspberry Pi].
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# Vcc (3-6v)
# SDA
# SCL
# Gnd (Ground)
I2C permits sensors and other IO devices to be connected to the controller (and/or each other) with only four wires (or really only ''two'' if you don't count Vcc and ground):
At line 8 changed one line
The Pimoroni "Breakout Garden" set of I2C sensors also includes an "{{{INT}}}" (interrupt) pin, ''AKA'' "{{{GCLK}}}" or "{{{GPIO4}}}".
# __3-6V__ (Vcc)
# __SDA__ (Serial Data Line)
# __SCL__ (Serial Clock Line)
# __GND__ (Ground)
At line 10 changed one line
Some well known I2C products. No two I2C
The Pimoroni "Breakout Garden" set of I2C sensors also includes an "__{{{INT}}}__" (interrupt) pin, ''AKA'' "{{{GCLK}}}" or "{{{GPIO4}}}".
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!! To View the Current I2C Devices
To see what's connected on your Raspberry Pi, type (not including the {{{%}}} prompt):
{{{
% i2cdetect -y 1
}}}
and you'll see something like:
{{{
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- 14 15 -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- 28 -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --
70: -- -- -- -- 74 75 -- 77
}}}
!! Known I2C Devices
Some well known I2C products. No two I2C may share the same address on an I2C bus, otherwise there will be contention.
This page (revision-21) was last changed on 2021-11-21 04:33 by Murray AltheimTop