Hardware description and configuration
Powering the evaluation board
There are several options to supply power to the evaluation board's module.
Unregulated external supply
Arduino or Raspberry Pi
The module will derive power from a connected Arduino or Raspberry Pi.
The module on the evaluation board can be configured to transmit/recieve radio-frequency signals via its integrated trace antenna or via an external antenna connected to the board's SMA connector. Use of an external antenna can lead to improved performance relative to the trace antenna. To switch the configuration of the module using the command line utilities provided by Link Labs, please refer to this article.
For operation in the US ISM band (902--928 MHz), Link Labs recommends the Linx Tech ANT-916-CW-HWR-SMA, which is a center-fed half-wave dipole antenna.
The evaluation board includes a single red light-emitting diode (LED), labeled IO0. The LED illuminates anytime the module sets the host interrupt line (i.e., when one/many of the module's interrupt flags is/are latched).
The evaluation board includes a RESET pushbutton. Depressing this button drives pin 7 low (the module's pin 7). When the button is released, an internal pull-up drives pin 7 high to actuate a hardware reset.