Page 46 - Shaping A Sustainable Future

The “Spider” is an effective and low-cost device to Item Description Part Number (Images) Price
reduce carbon emissions for Cavill. (See Figure 5 for Main computing module Wemos D1 R32 $6 17,180
pictures of "Spider and incorporated modules.) The low with built-in Wi-fi. (ESP32- based)
cost can attract SMEs to adopt such a solution rather
than overhaul their conventional aircon system to an
intelligent aircon system. The overhaul requires a heavy
investment that most companies are reluctant to do
so. The estimated cost of each “Spider” is around SGD Infra-red transmitter $1
30.00 per set (see Table 3: Bill of Materials). Transmitter for sending IR
codes to IR- controllable
devices. E.g. aircon

Infra-red receiver KY-022 $1
Receiver for decoding IR
codes

Temperature sensor DB18B20 $1
Temperature sensor
for sensing the room
temperature. The
temperature values are
readily available for
consumption by remote end
devices.
The prototype. Light Intensity sensor GY-30 $1

Light intensity sensor to
detect light switching on-off.
This is to see if the light
is left switched on when
no one is in the office or
switched off when the last
employee left the office.
Motion sensor PIR-Motion Sensor $1

For sensing motion in
the room to detect if the
The fully assembled “Spider.” employee is still in office.

Figure 5: Pictures of “Spider” and incorporated modules
Table 3: Bill of materials.

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