 
|
A sensor that behaves like an elastic string. Elongate it and see the sensor value change. Correlate the extension with the pulling force.
Application examples
- Use as a breathing sensor. Detect inhale/exhale cycles.
- Detect relative motion or vibration between two mostly stationary objects.
Technical specifications
| Product |
Stretch sensor |
| Version |
1.0 (March 2012) |
| Sensing parameter |
pulling force |
| Sensing method |
piezo-resistive |
| Range |
20 cm (larger stretch may damage product) |
| Active area |
50 x 0.15 cm (20 x 0.059 inch) |
| Output impedance |
6.9 KOhm (at rest) to 7.4 KOhm (at maximum stretch) |
| Calibration |
| Force (N) |
Voltage (use 5 V power supply) |
7-bit MIDI value (use 'no processing' editor preset) |
| 0 |
0 |
0 |
| TBD |
5 |
127 |
| Power supply |
1.0 to 10 V DC, 0.3 mA at 5 V |
| Sensor dimensions |
70 x 1.8 x 1.4 cm (28 x 0.71 x 0.55 inch) |
| Weight |
18 g (0.28 oz), incl. cable |
| Cable |
0.90 m (35 inch) twisted, unshielded, red wire = power, black wire = ground, white wire = sensor output, maximum extension 30 m (98 ft) |
| Connector |
male plug with a row of 3 pins spaced 2.54 mm (0.100 inch) |
| Application notes |
Due to hysteresis, the sensor output curve (elogation distance versus pulling force) will not be the same when increasing the pulling force versus decreasing the force.
Stretching the elastic part of the sensor beyond the maximum range may damage the sensor.
To use the sensor for detection of breathing cycles, place the sensor around the chest and use the drawstring toggle to tighten it. Let the sensor adjust itself, then measure the change in elongation. |
|
LinkedIn group
Facebook page