– –
16
Using the Handheld Transmitter Evaluation Board
Snap a Carrier Board onto the socket on the Handheld Transmitter
Evaluation Board and install the batteries and an antenna as shown in
Figure.
The receiver board is powered by two AAA batteries. A Linx HumPRC
TM
Series transceiver is used for reception of the transmitted signal. This
receiver provides exceptional sensitivity, allowing the transmitter and
receiver to operate at distances of up to 0.8 mile (1,300m) depending on
signal conditions. The data recovered by the transceiver is validated and
if everything is correct, the status line outputs are updated to match the
states of the buttons on the transmitter. To demonstrate this, one status
line on the evaluation board is used to drive a buzzer while the other
lines activate LEDs. The board also has a prototyping area with all of the
transceiver lines brought out to a header.
Turn on the power to the board, and press a button on the handheld
transmitter. When S0 is pressed, the buzzer sounds; when S1–S7 are
pressed, the LEDs turn on. When any button (S0–S7) is pressed on the
transmitter, the corresponding output (S0–S7) is active high (V
CC
) on the
prototyping header.
Simple range testing can be performed with the transmitter and Evaluation
Board by placing the board in a stationary location and walking away with
the transmitter. When in good signal range, as a button is pressed on the
transmitter, the buzzer will sound or an LED will light up on the Evaluation
Board. Also, the Acknowledgement LED will light on the transmitter.
When the Evaluation Board no longer activates and moving around a
few feet does not restore operation, the maximum range in the operating
environment has been reached.
Figure 15: Assembled Handheld Transmitter Evaluation Board
Содержание HumPRC Series
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