The Steam Controller is designed to work with all the games on Steam: past, present, and future. Even the older titles in the catalog and the ones which were not built with controller support. (We've fooled those older games into thinking they're being played with a keyboard and mouse, but we've designed a gamepad that's nothing like either one of those devices.) We think you'll agree that we're onto something with the Steam Controller, and now we want your help with the design process.
Traditional gamepads force us to accept compromises. We've made it a goal to improve upon the resolution and fidelity of input that's possible with those devices. The Steam controller offers a new and, we believe, vastly superior control scheme, all while enabling you to play from the comfort of your sofa. Built with high-precision input technologies and focused on low-latency performance, the Steam controller is just what the living-room ordered.
The most prominent elements of the Steam controller are its two circular trackpads. Driven by the player's thumbs, each one has a high-resolution trackpad as its base. It is also clickable, allowing the entire surface to act as a button. The trackpads allow far higher fidelity input than has previously been possible with traditional handheld controllers. Steam gamers, who are used to the input associated with PCs, will appreciate that the Steam Controller's resolution approaches that of a desktop mouse.
Whole genres of games that were previously only playable with a keyboard and mouse are now accessible from the sofa. RTS games. Casual, cursor-driven games. Strategy games. 4x space exploration games. A huge variety of indie games. Simulation titles. And of course, Euro Truck Simulator 2.
In addition, games like first-person shooters that are designed around precise aiming within a large visual field now benefit from the trackpads' high resolution and absolute position control.
Trackpads, by their nature, are less physical than thumbsticks. By themselves, they are "light touch" devices and don't offer the kind of visceral feedback that players get from pushing joysticks around. As we investigated trackpad-based input devices, it became clear through testing that we had to find ways to add more physicality to the experience. It also became clear that "rumble", as it has been traditionally implemented (a lopsided weight spun around a single axis), was not going to be enough. Not even close.
The Steam Controller is built around a new generation of super-precise haptic feedback, employing dual linear resonant actuators. These small, strong, weighted electro-magnets are attached to each of the dual trackpads. They are capable of delivering a wide range of force and vibration, allowing precise control over frequency, amplitude, and direction of movement.
This haptic capability provides a vital channel of information to the player - delivering in-game information about speed, boundaries, thresholds, textures, action confirmations, or any other events about which game designers want players to be aware. It is a higher-bandwidth haptic information channel than exists in any other consumer product that we know of. As a parlour trick they can even play audio waveforms and function as speakers.
Read more about the controller here.