Deprecated function: abs(): Passing null to parameter #1 ($num) of type int|float is deprecated in format_size() (line 137 of core/includes/common.inc).
Deprecated function: abs(): Passing null to parameter #1 ($num) of type int|float is deprecated in format_size() (line 137 of core/includes/common.inc).
Deprecated function: abs(): Passing null to parameter #1 ($num) of type int|float is deprecated in format_size() (line 137 of core/includes/common.inc).
Deprecated function: abs(): Passing null to parameter #1 ($num) of type int|float is deprecated in format_size() (line 137 of core/includes/common.inc).
Using an XBee wireless transmitter and receiver system to send GPS timing data to an Arduino Mega
