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→Méthode par lecture Analogique de la tension
The way this works is that as the resistance of the FSR decreases, the total resistance of the FSR and the pulldown resistor decreases from about 100Kohm to 10Kohm. That means that the current flowing through both resistors increases which in turn causes the voltage across the fixed 10K resistor to increase. Its quite a trick!
The way this works is that as the resistance of the FSR decreases, the total resistance of the FSR and the pulldown resistor decreases from about 100Kohm to 10Kohm. That means that the current flowing through both resistors increases which in turn causes the voltage across the fixed 10K resistor to increase. Its quite a trick!
{| class="wikitable" border="1"
|-
| align="center" | Force (lb)
| align="center" | Force (N)
| align="center" | FSR Resistance
| align="center" | (FSR + R) ohm
| align="center" | Current thru FSR+R
| align="center" | Voltage across R
|- style="font-size: 90%"
| align="left" | None
| align="left" | 0.1 lux
| align="left" | 600 KOhms
| align="left" | 610 KOhms
| align="left" | 0.008 mA
| align="left" | 0.1 V
|- style="font-size: 90%"
| align="left" | None
| align="left" | 1 lux
| align="left" | 70 KOhms
| align="left" | 80 KOhms
| align="left" | 0.07 mA
| align="left" | 0.6 V
|- style="font-size: 90%"
| align="left" | Infinite
| align="left" | 10 lux
| align="left" | 10 KOhms
| align="left" | 20 KOhms
| align="left" | 0.25 mA
| align="left" | 2.5 V
|- style="font-size: 90%"
| align="left" | Infinite!
| align="left" | 100 lux
| align="left" | 1.5 KOhms
| align="left" | 11.5 KOhms
| align="left" | 0.43 mA
| align="left" | 4.3 V
|- style="font-size: 90%"
| align="left" | 0 mA
| align="left" | 1000 lux
| align="left" | 300 Ohms
| align="left" | 10.03 KOhms
| align="left" | 0.5 mA
| align="left" | 5V
|- style="font-size: 90%"
| align="left" | 0 V
| align="left" | 1000 lux
| align="left" | 300 Ohms
| align="left" | 10.03 KOhms
| align="left" | 0.5 mA
| align="left" | 5V
|}
This table indicates the approximate analog voltage based on the sensor force/resistance w/a 5V supply and 10K pulldown resistor.
This table indicates the approximate analog voltage based on the sensor force/resistance w/a 5V supply and 10K pulldown resistor.