CSI Keyboards recently worked with a customer in developing a seat belt reminder pressure sensor.  A seat pressure sensor is very similar to a membrane type contact sensor. The contacts of the sensor evenly distribute on the stress-bearing surface of seat, which will generate a trigger signal when the external force presses down on the seat. 

This type of sensor can be applied to any car seat occupant perception system, such as: a safety belt reminder, taxi automatic message accounting system, airbag sensor, and can also detect when an occupant leaves the seat. 

Sensor Parameters:

• Ambient temperature: 20℃ ± 5℃
• Rated working voltage: 13.5V
• Rated long-time working current: ≤10mA
• Short-time/Pulse working current: ≤20mA
• Limit voltage: 19VDC
• Insulation resistance: ≥100MΩ
• Loop resistance: >40Ω