Hey
I'm connecting the sensor like here:
how much current will it draw? i want to choose a proper battery...
Thank you !
Depends on the value of FSR in series with R, if FSR = 10k total = 20k, current = 5V / 20k = 0.00025 Amps or 0.25 milliAmps, if FSR = 7k then current = 5V / 17k = 0.29 mA.
Guess you know "k" means "kilo" means 1000 and "milli" means 1 / 1000.
The current through those two resistors in series is a lot less than the supply current a big-board Arduino draws.
Leo..
756E6C:
Depends on the value of FSR in series with R, if FSR = 10k total = 20k, current = 5V / 20k = 0.00025 Amps or 0.25 milliAmps, if FSR = 7k then current = 5V / 17k = 0.29 mA.
Guess you know "k" means "kilo" means 1000 and "milli" means 1 / 1000.
OK, so if I replace the 10K resistor for a bigger value, lets say 20kohm, will it consume less current?
Highest sensitivity is when the FSR resistance is about the same as the value of the fixed resistor.
But any other value (within reason) can be used.
Note that the pictured Arduino draws ~50mA. And the sensor ~0.25mA.
Leo..
OK, so if I replace the 10K resistor for a bigger value, lets say 20kohm, will it consume less current?
You can figure this out for yourself using Ohm's law: voltage = current*resistance.