I am trying to make a band. And,For that,I need to know that which sensor is there that can be placed on the WRIST to detect a pinch of fingers.
P.S. I was thinking about MEAS Piezo vibration sensor. Will it work? If not,Then which sensor will? Thanks!
A flex sensor will detect pressure. If the pressure comes from a pinch gesture, great.
There are no pinch sensors.
Pinch how?
Piezo can detect being pressed or even touched. With high amplification they can detect ants walking on them, there's a Youtube with that.
Press the piezo and current flows one way, release and it flows the other. I dealt with it using regular diodes to energize two transistors (one for press, other for release) that fed jumpers to two pins. The jumpers load up with electrons proportional to the touch. To read that I count digital reads to take the wire down from HIGH to LOW -- each digital read only takes a tiny bit of current, a very soft touch takes 20 reads or so while a hard smack with a screwdriver handle can go 2000 reads or more.
You never want to put negative volts on the Arduino pin or more than 5.5V (5V to be safe). The diodes let me route the piezo spike to the NPN transistor that works by current and seems to handle it. I feed 5V through a 2.2K resistor to the collector and hook the emitter to the pin. The pin never gets > 5V.
What would probably work okay is piezo -> opto-isolator -> Arduino. The opto led is a diode and I did get the idea for the circuit from a piezo demo where tapping on the disk makes a led shine.