Tsukumo Robot Kingdom in Akihabara just started selling two new sensor options for the Hitec Robonova-1. Both sensors are sourced from Hitec Muliplex Japan, so apparently they are officially supported products compatible with the Robonova-1 humanoid robot.
The first sensor, pictured left, generates a digital sensor output signal when touched. The sensor substrate is only 12.9x29 mm. The second sensor is a peak sound detector that generates a signal if it hears a loud noise like clapping hands.
Both sensors are priced at 2,000 yen on the Tsukumo Robot Kingdom website.