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Lesson 26 Metal Touch Sensor
Introduction
A metal touch sensor is a type of switch that only operates when it's touched by a charged
body. It has a high-frequency transistor which can conduct electricity when receiving
electromagnetic signals.
Components
-
1 * SunFounder Uno board
- 1 * USB data cable
- 1 * Metal touch sensor module
- Several jumper wires
Experimental Principle
In this experiment, touch the base electrode of a transistor with fingers to make it conduct
electricity, for human body itself is a kind of conductor and an antenna that can receive
electromagnetic waves in the air. These electromagnetic wave signals collected by human
body are amplified by the transistor and processed by the comparator on the module to
output steady signals.
With the LED attached to pin 13 of Uno, connect pin D0 of the sensor to D7 of the Uno board.
When the metal touch sensor detects touch signals, the LED will be on. Otherwise, it will be
off.
Experimental Procedures
Step 1:
Build the circuit
Metal Touch Sensor SunFounder Uno
AO ------------------------------------------- A0
G -------------------------------------------- GND
+ -------------------------------------------- 5V
D0 ------------------------------------------- D7
Step 2:
Program (Please refer to the example code in
LEARN -> Get Tutorial
on our
website
)
SunFounder