This article is about LEDs connected in series. We’ll focus in LEDs for LCD backlight, but the content also applies to most strings of serially connected LEDs.
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One of the nit-picking criticisms the Raspberry Pi boards get, is that they do not have an on-board real-time clock. When the power is switched off, those poor Raspberries forget what time and day it is.
In this quick tutorial we’ll enable the I2C bus on the Raspberry Pi.
By default the Raspberry Pi comes with the I2C channel disabled. In order to enable it we have two options: enable it “on-demand” or enable it by modifying some configuration files so it’s enabled by default at every start-up.