Little Bits - Sequencer

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The sequencer allows you to connect up to eight outputs and control them in sequential patterns. Sequences that would take as long as 4 days to program without littleBits will only take you seconds!

--Automatically cycle through the entire sequence
--Control the speed of the sequence using dimmers or sensors
--Run the sequence four ways: forwards, backwards, pendulum, or random
--Swap automation for full control and step through each part of the sequence using a button, sound trigger, or any other high signal input

GEEK SPEAK
There are two clock modes that control when the module transitions from sequence step to sequence step. In step mode the sequence transitions to a new sequence step on input low-to-high transitions. In this mode, the clock output is high when the input is above 2.5V, and the clock output is low when the input is below 2.5V.

In speed mode the sequence transitions to a new sequence step at a fixed frequency. The step frequency is proportional to the voltage at the input. At 0V input, the frequency is 0Hz (the sequencer does not step). At 5 volts the step frequency is approximately 80Hz. In this mode, the clock output is a square waveform at the step frequency The four sequence modes control the order in which the 8 sequenced outputs are activated. At any given time, there is exactly one of the 8 sequenced outputs set to 5V. All other outputs are set to 0V. 

Forward mode sets output 1 to 5V, then on the next step output 2 is set to 5V, and so on. After activating each output in turn, the sequence then continuously repeats, starting at output 1.

Backwards mode is the same as forward mode, except that the sequence steps from output 8 to output 1 and is set to 5V at each step.

Pendulum mode sets output 1 to 5V, then on the next step output 2 is set to 5V, and so on. Upon reaching output 8, the sequence reverses and steps down from 7 to 1.

Random mode sets a randomly selected output to 5V at each step.

UNDER THE HOOD
The input signal is buffered by an opamp (U1), then passed through a single pole RC low pass filter, then a 2-pole active low pass filter (U3). The combined filters band limit the signal to 160Hz with an 18dB per octave filter slope. This signal is split into two paths. One path leads to the Analog-to-Digital Converter (ADC) of an Atmel ATMEGA168 microcontroller (U2). The other path leads to a General Purpose Input-Output (GPIO) pin on the same microcontroller. The path to the ADC is used in speed mode because in speed mode, we need to precisely measure the input voltage, and the ADC is precise. The path to the GPIO pin is used in step mode, because we need to quickly measure the timing of an input low-to-high transition, and the GPIO pin responds very quickly to transitions. Depending on the clock mode, microcontroller converts the measured input values into either the sequencer step speed in speed mode, or simply goes to the next sequencer step when it detects a low-to-high transition in step mode. These values are translated into signals that control the pins of the microcontroller connected to the various outputs.

(LBH804)

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