Derek Holzer wrote: > This makes sense. I used some FSRs with a hacked joystick HID device and > got into some trouble there as well. FSRs have zero resistance when no > force is applied, so essentially you are short circuiting the 5v > directly to ground when you plug them in without any force applied. I > would definitely try a resistor in series with each FSR, that's how I > did it with the HID joystick, which also crashed (the joystick did not > function) when the FSR was plugged in without any resistance.
FSR have a very _high_ resistance with no force. The resistance goes down when you apply pressure. The circuit needs to look like this: 5V | 10k | +------analog in | FSR | Ground This will give a number that goes down as force is applied. If you want the number to increase, switch the 10k and FSR. Looking at the (considerably more expensive than a 10k resistor) phidget voltage divider I see that the resistance is a multi-turn 1Meg potentiometer. If it is set to zero ohms then pressing a sensor will short out the power supply. Also by convention the red wire is 5V, the black wire is ground and the white is the analog signal. Martin _______________________________________________ PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
