has been sent, and the alarm will sound. The default is the
“Latch” mode. The alarm will sound for about 10 seconds,
then turn off. However, the alarm LED will stay red until
the reset is pressed.
By holding down the reset switch for three seconds,
the “enunciator” yellow LED will turn on. The alarm will
give a short beep and the alarm LED will change colors
momentarily. For those who perform their own
programming, again check out “Hints and Tips.”
Building the Transmitter
For both the transmitter and receiver, I have added
for the receiver’s
Refer to Figure 4.
sensor or sensors you
are going to be using.
Solder IC2, first noting
pin 1. Solder the
socket for IC1 and
then IC3 (if used),
noting that the square
pad is pin 1.
For the light
mode, solder D2. Its
long pin goes to the
square pad and R6
30 October 2013
■ FIGURE 3. ■ FIGURE 4.