Question in context with Adafruit 4-Digit 7-Segment Display with I2C Backpack

[bko]

A long long time ago I did this:

Time and Temp Project

Here is a simple little project that everybody can make and modify to meet their needs. First you need a core; then you need an 1.2 inch LED display with i2c backpack from Adafruit. And you need a one-wire temperature sensor. And three 4.7K resistors. The display very nicely has separate power pins for the LEDs, which need +5V and the i2c port which can run on 3.3V. So wire it up like this: Display Spark IO +3.3V +5V Vin GND GND SDA …

It uses the Adafruit library for the i2c backpack, which includes a setBrightness command that takes 0-15 as input values.

By the way, that Core-based project is still running on my desk at home.