| Author | Message | | | eric | | Posted: Mon Aug 28, 2006 12:10 pm Post subject: HT12E Pushbutton Switch Extension | | | | Site Admin Joined: 01 Jan 1970 Posts: 311 | We have already used the Holtek HT12E as an encoder in several
previous projects, primarily for remote controls. This
encoder is triggered by a Low level on the TE (Transmission
Enable) input. The transmitted address (and optionally data) can
be set on the A0–A7 and AD8–AD11 inputs, for instance using
DIP switches (internal pull-up resistors are present). The trick is
now to change the address at the same time by pressing a second
button. This is possible if a diode is added to the circuit.
Schematic diagram A shows the simplest version. S1 is connected
according to the standard application circuit for the IC,
while S2 can also be used to connect
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