Hello!
I've got a litle project here, what I simply want to do is to take my phones weight, which according to the seller is 135 gram, and make my arduino notice that it's my HTC Hero when I put it on my FSR(Force Sensitive Resistor - Square - SEN-09376 - SparkFun Electronics).
I've managed to calculate an equation which converts the pressure on the FSR from gram to KOhm it goes like this y = 222.178x^(-0.76285) where y = Kohm and x = pressure in grams.
So if I put my phone on the FSR it should make the resistance go to around 5.26715 Kohm, now how can I convert that value to voltage?
I know the Ohms law U = RI but I don't really know how to use it.
My FSR is hooked up really easy, just like this with a 10k pull down resistor
Thank you so much!
calculate the amperage in the circuit, amperage or I in a dc series circuit stays the same for that particular loop. So you have to define that and put it into the equation.
You have created a voltage divider. Search the forums (or wikipedia) to show you how to do the math.
wildbill:
You have created a voltage divider. Search the forums (or wikipedia) to show you how to do the math.
In his PWM Tutorial , Grumpy Mike shows a good pic of a voltage divider and how to calculate the voltage