Sensor blocks have been gotten an idea from Sensor mod, but they fit in vanilla game more than it. When these sensor blocks sense anything, they "output" any key signals, as same as a player press a key. For example, if they're set C key, cannons would shoot a bullet when the sensors work. Idea 1. Touch sensor Touch sensor is similar to pistons, but it can't be put other blocks on it. When anything touch it, it output any keys. If its "sensitivity" is maximum, it sense everything even a wind. If it's minimum, it sense only huge impacts like a bomb explosion. "Output time" is how long it's outputting keys. If this is much long, it could control steering hinges, or shoot crossbows several times. Idea 2. Infrared sensor Infrared sensor senses things into a certain area. It can be change a range. Idea 3. Speed sensor Speed sensor senses its own speed. Each speed sensors have "threshold" value. When it reaches this speed, it outputs any keys. Idea 4. Heat sensor Heat sensor senses fire. When the neighboring blocks are set a fire, or flames hit the sensor directly, it outputs any keys. Examples how to use them: I believe they will produce great innovations to Besiege. I'm glad if these ideas would be considered! thanks.