Does anyone know of any cheap suction pads that can be triggered electronically? I'm looking to build a robot that can climb smooth surfaces like glass and smooth walls, and suction pads are the only method that I can think of... If not does anyone know of alternative methods? It needs to be cheap, strong and quiet though!
Edit: What about using static electricity (like rubbing a balloon so it sticks to a wall) ? Any thoughts on that idea?