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V. | e-TEXTILES

- How to start?

| ELECTRICITY, CURRENT, VOLTAGE, RESISTANCE |

  • ELECTRICITY
  • the flow of electric charge
  • CURRENT
  • the flow of electricity through an object, such as a wire
  • it is measured in amps (A), if the current is very small then it is described in milli-amps (mA), 1000 mA = 1A.
  • VOLTAGE
  • the flow of electrons (low, high)
  • the driving force (electrical pressure) behind the flow of a current is known as the voltage and is measured in volts (V)
  • RESISTANCE
  • allows the ammount of electrons to pass
  • the property of a material that limits current flow is known as its resistance (R), the unit of resistance is the ohm (Ω)
Ohm's law CURRENT VOLTAGE RESISTANCE
I = V / R I (A) V (V) R (Ω)

| TOOLS |

MULTIMETER

  • a handheld tester used to measure electrical voltage, current (amperage), resistance
  • analog and digital versions
  • measuring battery voltage, to detecting faults and complex diagnostics
  • motors, appliances, circuits, power supplies, and wiring systems

TYPE OF SENSORS

  • DIGITAL - toggle (ON / OFF SWITCH)
  • ANALOG - pressure (through the material, across the material, bend,), stretch, location, bend and their combinations

| ARDUINO - UNO |

- components: UNO R3 Board, Breadboard, USB Cable, Jumpers, Resistor, LED, Button, Potentiometer, Photoresistor

| PROGRAMMING |

  • BLINK function
  • it blinks the on-board LED
  • components: UNO Board, Breadboard, LED, Resistor, Jumper wires
  • programming:
  • FILE -> EXAMPLES -> 01. BASICS -> BLINK

FADE

  • FADE function
  • This example demonstrates the use of the analogWrite() function in fading an LED off and on. AnalogWrite uses pulse width modulation (PWM), turning a digital pin on and off very quickly with different ratio between on and off, to create a fading effect
  • components: UNO Board, Breadboard, LED, Resistor, Jumper wires

  • programming: * FADE - FILE -> EXAMPLES -> 01. BASICS -> FADE

  • Make sure everything is connected before sending the code to Arduino.

  • Connect your BOARD to your Arduino - TOOLS -> BOARD -> Arduino Uno

  • Choose which PORT of your computor is connected to your Arduino - TOOLS -> PORT -> Name of your device

map()

  • mapping function
  • re-maps a number from one range to another

  • a value of fromLow would get mapped to toLow, a value of fromHigh to toHigh, values in-between to values in-between, etc

  • Syntax: map(value, fromLow, fromHigh, toLow, toHigh)

  • Parameters:

  • value: the number to map.
  • fromLow: the lower bound of the value’s current range.
  • fromHigh: the upper bound of the value’s current range.
  • toLow: the lower bound of the value’s target range.
  • toHigh: the upper bound of the value’s target range.

- Example code:

Referencies

SENSORS

REFERENCIES

| CONDUCTIVE FABRICS |

Copper Ripstop Fabric Shieldex Kassel
  • Company: Statex
  • Characteristics: Corrosion proof copper-silver plated polyamide ripstop fabric, < 0.03 Ohms/cm2 surface resistivity.
Velostat
  • Company : lessEMF
  • Characteristics: Piezo resistive. Changes its resistance when pressed. Good for pressure sensors.
Eeontex
  • EeonTex NW170-PI fabric * conductive, nonwoven microfiber for use in e-textiles as well as electromagnetic and resistive heating applications
  • EeonTex Conductive Fabric is highly conductive with a tunable surface resistivity of 8 Ohm/sq to 105 Ohm/sq. Additionally, it is extremely durable with a tensile strength of >450N and a tear resistance of 12N
  • This is non-stretch fabric
REFERENCIES

| SOFT SENSORS |

Last update: 2021-12-20