ELM711
ELM711 Operation
The ELM711 is a very simple sequencing circuit
will go to pattern 1.
that uses one of eight preset patterns to control five
output pins. When power is initially applied, the circuit
will reset itself, and will display pattern 1, a traditional
slow sequence, with the White LED on continuously.
If you wish to turn the circuit off, simply press the
pushbutton for at least 2 seconds. When the ELM711
sees this special signal, it will force all 5 outputs to a
low (off) level, and will keep them in that state until the
next time that the pushbutton is pressed. Provided that
the supply to the ELM711 was not interrupted, the next
time that the pushbutton is pressed, the circuit will
‘wake up’ and display the last-selected pattern.
While displaying an output pattern, the circuit
continuously monitors the pushbutton (PB) input for
signals from the user. If it sees a short pulse on this
pin, it will switch to the next stored pattern (see Table
1 for a description of all 8 patterns). Should the circuit
be displaying pattern 8 when the button is pressed, it
Pattern
1
Description
This one provides a slow twinkling of all of the coloured LEDs (the
White one will stay on continuously). The rate will vary slightly with
time to give a more natural appearance.
2
This pattern fades one colour out at a time (including the White one)
with a fairly slow period. LEDs are faded in the order White, Red,
Yellow, Green, and Blue.
3
4
5
6
7
8
The White LED stays on continuously, while the other colours fade in
and out very slowly. A relaxing pattern.
A fast blinking pattern – all LEDs (including the White) are only on for a
short time. Not a very relaxing pattern, but it does grab your attention.
Strings will light one at a time, with the White on throughout. Once per
sequence, the White LED will blink.
One colour at a time is added until all LEDs are on, then all turn off
and the pattern builds again.
Similar to pattern 6 with the strings building over time, but this pattern
also turns them off one at a time, rather than all at once.
This pattern provides a rapid twinkling of all the LEDs (including the
White one).
Table 1. ELM711 LED Patterns
ELM711DSA
Elm Electronics – Circuits for the Hobbyist
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