The ELM334 is a handy circuit for remotely monitoring the position of your garage door. A two-wire interface is all that is needed to convey the position of the door to two remotely located LEDs, and to also provide control for an electric opener if desired.
The ELM334 is an integrated circuit designed by Elm Electronics to remotely monitor the position of a garage door using two inputs. It features a low-power CMOS design operating on a wide supply range of 3.0V to 5.5V and utilizes fully debounced inputs for reliable state detection.
| Supply Voltage Range | 3.0 to 5.5 V |
|---|---|
| Average Supply Current | 1.0 to 2.4 mA (typical) |
| Debounce Period for Position Switches | 500 msec |
The maximum output pulse width is 500 msec if the pushbutton input remains active.
If both switches are simultaneously open or closed, the LEDs alternate flashing red and green as a warning.