Using Vin pin safely

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hi,

i want power arduino safely vin , gnd using 9v battery. cannot use 2.1 mm power plug or 9v adapter jack since don't have following parts: http://arduino.cc/playground/uploads/learning/9v_tut_1.jpg. don't have time buy that.

my concern want feed arduino board(with wifi shield on it) using vin pin 9v battery. have read in forums here wiring vin , gnd in wrong way risky , can kill board voltage regulator. possible prevent using diode @ end of gnd pin?

any ideas?

you right, wiring vin wrong can kill board. have 2 wires -- it's hard wrong! if have 9v battery clip red wire , black wire. hook red wire vin, black wire gnd, , don't wrong :)

if want diode, hook in series red wire (anode: red wire, cathode: vin pin).

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