Player detector ( simple )

local radius = 120.0

local detector      = peripheral.find( "playerDetector" )
local integrator    = peripheral.find( "redstoneIntegrator" )

while( true ) do
    os.sleep( 2.0 )

    local players = detector.getPlayersInRange( radius )
    local inRange = ( ( #players ) ~= 0 )

    integrator.setOutput( "right", inRange )
end