CHAPTER 10 ■ IOT PATTERNS: MACHINE TO HUMANSoftware Required
In order to develop this waste management system, you need the following software :
- Arduino IDE 1.6.4 or later
- Effektif (hosted)
- Node-RED 0.13.2 or later
Circuit
In this section, you are going to build the circuit required for the waste management
system. This circuit uses an ultrasonic proximity sensor to detect objects, as illustrated
in Chapter 7. The sensor is attached to the top of a garbage can and sends an ultrasonic
burst that reflects off of the garbage in the can. The circuit reads the echo, which is used to
calculate the level of garbage.
Make sure Arduino is not connected to a power source, such
as to a computer via a USB or a battery.
Attach a WiFi shield to the top of the Arduino. All the pins
should align.
Use jumper cables to connect the power (5V) and ground
(GND) ports on Arduino to the power (+) and ground (-) ports
on the breadboard.
Now that your breadboard has a power source, use jumper
cables to connect the power (+) and ground (-) ports of your
breadboard to the power and ground ports of the proximity
sensor.
To trigger an ultrasonic burst, connect a jumper cable from
the TRIG pin of the sensor to Digital Port 2 of Arduino. Your
code will set the value of this port to LOW, HIGH, and then
LOW in order to trigger the burst.
To read the echo, connect a jumper cable from the ECHO pin
of the sensor to Digital Port 3 of Arduino. Your code will read
the values from this port to calculate the level of garbage in
the can.
Your circuit is now complete and should look similar to Figures 10-3 and 10-4.