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School of Maaa Day 2 - Voltage Dividers
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Becky Stewart
August 14, 2014
Technology
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360
School of Maaa Day 2 - Voltage Dividers
Theory behind making your own variable resistor sensors.
Becky Stewart
August 14, 2014
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Transcript
Voltage Dividers
Pressure Sensor Cushion Pauline Vierne http://etextile-summercamp.org/2014/pressure-sensor-cushion/
LaceSensor Dresses Anja Hertenberger and Meg Grant http://lacesensorproject.com/
Mi.Mu Gloves http://theglovesproject.com/
Stretch Sensor
Soft Potentiometers
Squeeze Sensor
Arduinos can only watch changes in voltage. ! Not changes
in resistance or current.
But we can turn a changing current or resistance into
a changing voltage by being clever.
Vin Vout GND GND R1 R2 Voltage Divider
Vin Vout 5V GND GND R1 R2 Something between 5V
and GND Voltage Divider
Vin Vout 5V GND GND R1 R2 Something between 5V
and GND Voltage Divider
Vin Vout 5V GND GND R1 R2 Something between 5V
and GND Voltage Divider = Vout Vin x R1 + R2 R2
Vin Vout GND GND R2 Voltage Divider R1 knit sensor
Vin Vout GND GND R2 Voltage Divider R1 knit sensor
Voltage Divider
Vin Vout GND R1 R2 Voltage Divider potentiometer *In this
circuit, both R1 and R2 are changing when the knob is turned.
Voltage Divider 1. Does the object change resistance when you
interact with it? Check with a multimeter. 2. If does, create a voltage divider. Decide if you want the object to be R1 or R2. 3. Choose a static resistor that gives you the values you are looking for.
Challenge Create an analog sensor using soft materials. Demonstrate it
working with an Arduino.