Home Bar Equipment

What is the best way to work quads at home?
I can not now afford a gym membership or equipment is incredibly expensive. I have tried to bell stupid squats and barbell squats but never feels right to form and I have no watch. I own weights.
I guess u do not have any computer, if this is correct it would lunge and extend
Iron Gym Pull Up Bar – As Seen On Tv at MegaFitness.com