os.loadAPI("ocs/apis/sensor");

local offset = {
  X = 0,
  Y = 2,
  Z = 0,
}

function distance(pos)
  local deltaX = pos.X - offset.X;
  local deltaY = pos.Y - offset.Y;
  local deltaZ = pos.Z - offset.Z;

  return deltaX * deltaX + deltaY * deltaY + deltaZ * deltaZ;
end

local prox = sensor.wrap("right");

while true do
  local inRange = false;

  local targets = prox.getTargets();

  for k, v in pairs(targets) do
    local distSq = distance(v.Position);
    if (distSq <= 7) then
      inRange = true;
      break;
    end
  end

  redstone.setOutput("top", inRange);

  os.sleep(0.4);
end