Rover Surveillance Camera Draft

Raspberry Pi Yard Surveillance Camera

Features:

5MP Pan 180°, Tilt 150° camera

GPS Tracking

Obstacle Avoidance

Solar Panel Powered & Charged

Optional Wall Power Recharger Included

Two Solar Rechargeable Batteries

Visual Recognition for Close Proximity Return and Tracking

Optional Models:

Solar Powered Supersonic Pest Repellent

Outdoor Digital Temperature and Humidity Gauge

Night-vision Fisheye 1080p Camera

These are design notes for the construction of this prototype.

Video Tutorial to install RPi3B, boards, connections, python libraries and code,

Sample Code to use keyboard, smartphone, etc.

Surveillance System using MotionEye.

Bill of Materials

Item#

Description

Source

Unit Price

1

1080p SPY Camera

amazon.com

$30.00

2

Servo HAT for RPi

adafruit.com

$17.50

3

Pan/Tilt Gimbal

adafruit.com

$19.00

4

Glass Dome

collectingwarehouse.com

$5.00

5

Raspberry Pi 3B+

adafruit.com

$35.00

6

RPi Case

adafruit.com

$8.00

7

Solar Panel 1

adafruit.com

$39.00

8

USB/DC/Solar Battery charger – v2

adafruit.com

$17.50

9

CPU Battery for Power

amazon.com

$11.00

10

Tank Wheels Base

amazon.com

$74.00

11

Solar Panel 2

adafruit.com

$39.00

12

USB/DC/Solar Battery charger – v2

adafruit.com

$17.50

13

Servo Battery for Power

amazon.com

$11.00

14

Pest Repellent

walmart.com

$40.00

15

GPS

amazon.com

$21.00

16

Obstacle Avoidance Sensor Module

amazon.com

$15.00

17

Wires, connectors, etc.

various vendors

$29.35

$428.85

Battery Notes:

Battery capacity is measured in Amp Hours (e.g. 100Ah). You need to convert this to Watt Hours by multiplying the Ah figure by the battery voltage (e.g. 12V) – see calculations above.

AH refers to amp hours. This rating is usually found on deep cycle batteries. If a battery is rated at 100 amp hours it should deliver 5 amps of power for 20 hours or 20 amps of power for 5 hours.

When choosing a deep cycle battery, keep in mind the equipment you will be powering and the time in which they will be running. Theoretically a 100Ah battery can deliver 5 amps over a 20 hour period (and so on). Taking into account the average small campsite – with a small 45W fridge running for 6 hours, 3 hours of 15W lighting and 20W of other electronic equipment – the minimum consumption to be expected is 335W. Take this wattage and divide it by the voltage, 12V, gives 28Ah. With the aim of leaving 50% in the battery brings the requirement to 56 Ah per day.

Solar Panels power generation is commonly given in Watts e.g. 120 Watts. To calculate the energy it can supply the battery with, divide the Watts by the Voltage of the Solar Panel.

120 Watts / 18v = 6.6 Amps OR for RPi 2 Watts / 6 Volts = .33 Amps

Florida Average Daylight Hours: 13:46 – 10:23, 13.77 – 10.38 = 3.39 / 2 = 1.69 + 10.38 = 12.05PAGE_BREAK: PageBreak

Calculation to determine Solar Panel requirements for 6V 2AH NiMH rechargeable battery (input in blue):

Calculation Type

Description

Value

Estimated Watt demand

3

Total Watts Per Hour (DC Amps x System Voltage)

13.2 Watts

Hours per day

6

Hours Equip is expected to run (24hr) per application

1 Hrs d-1

Watt-Hours per day

9

Total daily usage – Watts x Hours

13.20 Watt-Hrs d-1

Amp-hour calculation

10

Daily Total watts requirements

13.20 Watt-Hrs d-1

11

Corrected for battery losses – Assumes static average loss

13.464 Watt-Hrs d-1

12

System voltage – DC voltage only

6 Volts

13

Amp-hours per day (Watts divided by Volts)

2.244 Amp-Hrs d-1

Battery bank calculation

14

Average 24 hour periods of days backup power required

.3 days

15

Raw Amp-hour storage capacity you need

0.6732 Amp-Hrs

16

Depth of discharge – Assumes 50%

0.5 fraction (enter decimal)

17

Required amp backup – Prevents excessive discharge

1.3464 Amp-Hrs

18

Battery Capacity in Amp Rating (20 hr)

2 fraction

19

Actual Raw number of batteries wired in parallel

0.67

20

Batteries wired in series – Relates to system voltage

0.50

21

Rounded UP number of Batteries

1

Solar Panel Array calculation

22

Sun hours per day (Direct only)

12 Hrs

23

Worst-weather multiplier*

1.55 fraction

24

Total sun hours per day – Assumes average sun

7.742 Amp-Hrs

25

Select panel size (Watt hour rating)

3.6 Watts

26

Nominal Panel Voltage – Approximate Solar output

16 Volts

27

Amps required from solar panels – Total daily consumption

2 Amps

28

Peak amperage of solar panel – Watts divided by Volts

0.225 Amps

29

Raw Number of solar panels in parallel

1.288

30

Number of panels in series (12 V)

1

31

Rounded up number of solar panels

1

Source: https://www.batterystuff.com/kb/tools/solar-calculator.html

PAGE_BREAK: PageBreak

Prototype Development Plan

Things to be considered:

  1. Calculating wire ends and lengths
  2. Cooling/Heating
  3. Outdoor test unit and shelter – need to prevent from destroying unit, like into the pool
  4. Visual recognition capabilities – where to turn next, home, and other “learning” moments
  5. Ability to turn unit to get highest sun capacity