
The sensor is also able to count single and multiple presses.
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Using the NXT brick, the touch sensor detects pressure, i.e. when the button is pressed or released.

The sensor is also able to count single and multiple presses.
A LEGO cross axle can be attached to the sensor button.
You will need a connector cable, which is included in the 9797 Base Set.
Lego® Touch Sensor is a set by Lego from the "LEGO® MINDSTORMS®" theme (Set No. 9843, EAN: 5702014496200). According to the VERObricks database, the set includes 1 part, Recommended age 8+. Manufacturer description: "Using the NXT brick, the touch sensor detects pressure, i.e. when the button is pressed or released. The sensor is also able to count single and multiple presses. A LEGO cross axle can be attached to the sensor button. You will need a connector…"
Lego® Touch Sensor was released in August 2006. The set retired at the end of 2015 (EOL, end of life). New copies come from remaining stock only; for used ones, use the eBay search on this page.