I²CMini

by Excamera Labs

A tiny USB to I²C bridge that is compatible with I²CDriver

View all updates Dec 18, 2019

Making a Clock with I²C Mini

I²CMini is a tiny interface between USB and an I²C circuit. Here is an I²CMini, two I²C 7-segment LED modules, and a carrier board. It’s all you need to make a USB-connected bright red 4-digit display.

First solder the parts to the board, and plug in. The two LEDs should show horizontal bars, showing that they are powered up and waiting for an I²C command.

From here on everything is software. You can use the I²CDriver GUI, Python, the command-line or C++ to drive the DIG2 modules. I’m demonstrate in Python.

To start with, import the i2cdriver module and connect to the I²CMini:

>>> from i2cdriver import I2CDriver, EDS
>>> i2 = I2CDriver()

The ask it to do a bus scan. The two LEDs appear at address 14 and 15 respectively

>>> i2.scan()
-- -- -- -- -- -- -- --
-- -- -- -- 14 15 -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --

Next create two devices to drive the DIG2s like this

>>> d0 = EDS.Dig2(i2, 0x14)
>>> d1 = EDS.Dig2(i2, 0x15)

You can put decimal numbers on the displays with

>>> d0.dec(12)
>>> d1.dec(34)

And a clock is almost as easy:

>>> from datetime import datetime
>>> t = datetime.now()
>>> d0.dec(t.minute)
>>> d1.dec(t.hour)

And to run it constantly as a desktop clock, you can do

>>> while True:
...     t = datetime.now()
...     d[0].dec(t.minute)
...     d[1].dec(t.hour)
...

Voila - instant timepiece! These parts are included in the premium packages in the I²CMini campaign.


$3,997 raised

of $1 goal

Funded! Order Below

Product Choices

$17

I²CMini Core

An I²CMini from the first batch with a quicc cable.


$43

I²CMini Expert

Three I²CMinis from the first batch, three quicc cables, six I²C modules, and two module carrier boards.


$63

I²CMini Gold

Three I²CMinis from the first batch, three quicc cables, 20 I²C modules, and four module carrier boards.

Credits

Excamera Labs


James Bowman

Creator


Boktech

PCBA Manufacturer

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