NIME Update · posted by vaibhav bhawsar Oct 21, 21:15
Sensor information/research for the Udder controller-
I will be using the sensors mentioned below-
For Pressure
Fijikura XFPMC-050KpGR is a guage pressure sensor with 0-50 Kp Gauge pressure range. This should provide sufficient range of pressure detection for the instrument. This sensor will be used to detect the udder squeeze. I Currently waiting for some clarifications from the supplier.
ISSUE
not yet ordered Have trouble understanding what would be the appropriate pressure range (50Kp gauge pressure??) to detect a squeeze. 50 Kp seems right since atmsPressure itself is 100Kp absolute. Waiting for the supplier to answer my query.
For Stretch
To detect the udder stretch I will be using the 50cm merlin stretch sensor. This is a 2mm dia cord that changes its resistance (resistance increases) for every 1 cm increase in its length. I am currently looking for US suppliers of this sensor.
http://www.imagesco.com/sensors/stretch-sensor.html (this supplier has cheaper sensors compared to merlin and also lets you select a custom length)
http://www.merlinrobotics.co.uk/merlinrobotics/merlin-stretch-sensor-p-80.html
Ordered 4” and 6” cord
For Rotation
Using a 360d potentiometer is probably the most straightforward solution to this. Also have some ideas on how i could use another stretch sensor place diagonally across the length of the udder to detect how much the udder is rotated.
This weeks plan
Construct the upper part of the instrument which detects rotation (using a pot) and stretch (using the stretch sensor or for now a flex sensor). Try out a few mechanical configurations that will help detect stretch and rotation simultaneously using springs (in a wooden frame).
Issue (material)
I am still searching for a material for the udder. I want it to be stretchable and preferably with a cavity (so that it can house the pressure sensor). I have been looking at silicon as a material and casting procedures but don’t have a very clear idea. To put some of these ideas to test for now I am going to use a off the shelf inflated balloon (tube like) and some flexi plastic tubes.
Will upload some construction drawings before class.
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