DIY Capacitive Sensor
for Arduino

I've been using capacitive touch sensors in a number of my projects recently and just wanted to share a really quick and easy way to build one for yourself that works with Arduinos.

You’ll need:

• Tin foil
• An arduino capable development board (https://amzn.to/2BUbDRU)
• 10k Ohm (1k – 1M all work) (https://amzn.to/2Rn4wLU)
• Bread board and leads (https://amzn.to/2GXfO5A)
• Soldering Iron & Solder (https://amzn.to/2C2u6Mz)

Start by soldering a lead to a small piece of tin foil. Additional flux seemed to really help this process. Connect the resistor to a digital out pin (I used D0 on my Wemos D1 Mini) and the breadboard. On the same row of the breadboard connect both the sensor (tin foil lead) and a Digital In pin (I used D1).

// touch sensor
#include <CapacitiveSensor.h>

// touch sensor config
CapacitiveSensor capSensor1 = CapacitiveSensor(D0, D1);

void setup() {
  Serial.begin(115200);
}

void loop() {
  long sensorValue1 = capSensor1.capacitiveSensor(30);
  Serial.println(sensorValue1);
  delay(500);
}

The CapacitiveSensor library is available in the Library Manager and is the one by Paul Bagder and Paul Stoffregen.

Here’s a video of the project. Have fun, and happy hacking!