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Bill_of_Material.md

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Bill of Material

This includes a comprehensive list of all the individual electronic and non-electronic components used in the manufacture of the Prometheus Fire Alarm System. For an overall specification of the sensors, actuators and controllers; please refer to the Technical Specifications section.

  1. 10uF Capacitors
  2. 0.1uF Capacitors
  3. 10kΩ Resistors
  4. 100Ω Resistors
  5. 220Ω Resistors
  6. 20kΩ Resistors
  7. 2kΩ Resistors
  8. 1N4001 Diode
  9. Through Hole LED
  10. LMS1585 Voltage Regulator
  11. LM7805 Voltage Regulator
  12. XD549 ADC
  13. MQ-135 Gas Sensor
  14. DHT-11 Temperature/Humidity Sensor
  15. IRLML 6246 MOSFET
  16. TXS0108EQ Level Shifter
  17. SRD-05 Relay
  18. CPE-222H Buzzer
  19. DTS-62 Horizontal Switch
  20. XKB DC-005 Barrel Jack Connector
  21. 2x1 Molex Connector
  22. 1x13 Pin Header
  23. nRF 7002 DK Development Board
  24. 12V Power Supply with DC Barel Jack
  25. Micro USB Cable
  26. 1x13 Male to Female Ribbon Cable
  27. ZE-4F180 Valve with compatible tubing and spray end

Cost Breakdown

The nRF 7002 DK was recieved from the hardware giveaway program saving me around $56.49. (Rs. 18, 189.30) The direct cost was only involved with PCB manufacturing, assembly and shipping. Overall, the cost breakdown is as follows.

  • nRF 7002 DK: $0.00
  • PCB Printing: $4.00
  • Setup fee: $8.00
  • Stencil: $1.50
  • Components: $15.12
  • Extended components fee: $25.48
  • SMT Assembly: $0.46
  • Hand-soldering labor fee: $3.50
  • Manual Assembly: $0.96
  • Refund: -$0.06

This adds a merchandise total of $58.96 (Rs. 18, 984.62)

  • MERCHANDISE TOTAL: $58.96 (Rs. 18, 984.62)
  • SHIPPING CHARGE: $25.90 (Rs. 8, 339.58)
  • DISCOUNT: - $10.00 (Rs. 3, 219.92)
  • ORDER TOTAL: $74.86 (Rs. 24, 104.28)

This finally gives a total of $74.86 (Rs. 24, 104.28). Adding government taxes of Rs. 8, 000 ($24.85) gives a final expense of $99.71 (Rs. 32, 104.28).

  • ORDER TOTAL: $74.86 (Rs. 24, 104.28)

  • GOVERNMENT TAXES: $24.85 (Rs. 8, 000)

  • FINAL DIRECT COST: $99.71 (Rs. 32, 104.28)

Cost Details Order details

Bill of Material

10uF Capacitors - Quantity 4

These are mostly used in the PCB for voltage filtering. It is not important to have the exact values but 10uF would be the ideal value for these capacitors.

0.1uF Capacitors - Quantity 2

These are recommended components to be used in the ADC. Refer to its datasheet for the layout.

  • Components: C3, C6
  • Brand/Model: Yageo CC0805ZRY5V8BB104
  • Description: 25V 100nF Y5V -20%~+80% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHS
  • Datasheet: https://datasheet.lcsc.com/lcsc/2008171233_YAGEO-CC0805ZRY5V8BB104_C519930.pdf
  • JLCPCB: https://jlcpcb.com/partdetail/Yageo-CC0805ZRY5V8BB104/C519930

10kΩ Resistors - Quantity 7

These are used for pull-down purposes at the gate of MOSFETS. This is an ideal value for this application.

  • Components: R3, R7, R11, R12, R14, R17, R21
  • Brand/Model: Yageo AC0805JR-0710KL
  • Description: 125mW Thick Film Resistors ±100ppm/℃ ±5% 10kΩ 0805 Chip Resistor - Surface Mount ROHS
  • Datasheet: https://datasheet.lcsc.com/lcsc/2304140030_YAGEO-AC0805JR-0710KL_C138260.pdf
  • JLCPCB: https://jlcpcb.com/partdetail/Yageo-AC0805JR0710KL/C138260

100Ω Resistors - Quantity 5

These are used to drive the gate of MOSFETS. This is an ideal value for this application.

  • Components: R9, R10, R13, R16, R19
  • Brand/Model: Yageo AC0805JR-7W100RL
  • Description: 250mW Thick Film Resistors ±100ppm/℃ ±5% 100Ω 0805 Chip Resistor - Surface Mount ROHS
  • Datasheet: https://datasheet.lcsc.com/lcsc/2304140030_YAGEO-AC0805JR-7W100RL_C728002.pdf
  • JLCPCB: https://jlcpcb.com/partdetail/Yageo-AC0805JR7W100RL/C728002

220Ω Resistors - Quantity 2

These are used to drive the 5V source of MOSFETS. This is an ideal value for this application.

  • Components: R15, R18
  • Brand/Model: Panasonic ERJ6ENF2200V
  • Description: 125mW Thick Film Resistors ±100ppm/℃ ±1% 220Ω 0805 Chip Resistor - Surface Mount ROHS
  • Datasheet: https://jlcpcb.com/c27a378e-b8d6-4204-a609-b03341428117
  • JLCPCB: https://jlcpcb.com/partdetail/Panasonic-ERJ6ENF2200V/C413269

20kΩ Resistors - Quantity 1

This is an optional component used in case the ADC doesn't work.

  • Components: R4
  • Brand/Model: Yageo RC0805FR-0720KL
  • Description: 125mW Thick Film Resistors ±100ppm/℃ ±1% 20kΩ 0805 Chip Resistor - Surface Mount ROHS
  • Datasheet: https://datasheet.lcsc.com/lcsc/2304140030_YAGEO-RC0805FR-0720KL_C114566.pdf
  • JLCPCB: https://jlcpcb.com/partdetail/Yageo-RC0805FR0720KL/C114566

2kΩ Resistors - Quantity 1

These are recommended components to be used in the ADC. Refer to its datasheet for the layout.

  • Components: R8
  • Brand/Model: Panasonic ERJ6GEYJ202V
  • Description: 125mW Thick Film Resistors ±5% ±200ppm/℃ 2000Ω 0805 Chip Resistor - Surface Mount ROHS
  • Datasheet: https://datasheet.lcsc.com/lcsc/1912111437_PANASONIC-ERJ6GEYJ202V_C413188.pdf
  • JLCPCB: https://jlcpcb.com/partdetail/Panasonic-ERJ6GEYJ202V/C413188

1N4001 Diode - Quantity 1

Used to protect the circuit from the back EMF of the relay.

Through Hole LED - Quantity 1

LM7805 Voltage RegulatorUsed as the primary LED indicator.

LMS1585 Voltage Regulator - Quantity 1

Used to step down the 12V supply down to 3.3V for the development kit.

LM7805 Voltage Regulator - Quantity 1

Used to step down the 12V supply down to 5V for the sensors/indicators.

XD549 ADC - Quantity 1

Used to step down the 12V supply down to 5V for the sensors/indicators.

MQ-135 Gas Sensor - Quantity 1

Used to detect the presence of CO2 gas.

DHT-11 Temperature/Humidity Sensor - Quantity 1

Used to detect the temperature and humidity.

IRLML 6246 MOSFET - Quantity 3

Used for controlling digital output devices.

TXS0108EQ Level Shifter - Quantity 1

The nRF works with 3.3V while most IO devices operate in 5V. TXS0108 allows to bridge this voltage gap.

SRD-05 Relay - Quantity 1

Relay to control the valve.

CPE-222H Buzzer - Quantity 1

Buzzer indicator.

DTS-62 Vertical Switch - Quantity 1

Buzzer indicator.

XKB DC-005 Barrel Jack Connector - Quantity 1

5V DC connector for input power.

2x1 Molex Connector - Quantity 1

Standard 2x1 molex connector output to the valve.

  • Components: J2
  • Brand/Model: -
  • Description: -
  • Datasheet: -
  • JLCPCB: -

1x13 Pin Header - Quantity 1

Standard 2x13, 2.5mm pin header for IO with nRF7002 DK.

  • Components: J3
  • Brand/Model: -
  • Description: -
  • Datasheet: -
  • JLCPCB: -

nRF 7002 DK Development Board - Quantity 1

The nRF 7002 DK for control.

12V Power Supply with DC Barel Jack - Quantity 1

12V DC power supply with a DC barrel jack. Any power supply would do at a minimum of 500mA of supply current.

  • Components: -
  • Brand/Model: -
  • Description: -
  • Datasheet: -
  • JLCPCB: -

Micro USB Cable - Quantity 1

Any micro USB cable that can connect to the nRF 7002 DK would do.

  • Components: -
  • Brand/Model: -
  • Description: -
  • Datasheet: -
  • JLCPCB: -

1x13 Male to Female Ribbon Cable - Quantity 1

Cable used to connect the IO of nRF7002 DK to the Prometheus PCB v2.0.

  • Components: -
  • Brand/Model: -
  • Description: -
  • Datasheet: -
  • JLCPCB: -

ZE-4F180 Valve with compatible tubing and spray end - Quantity 1

Any valve that supports 12V operation with normally closed configuration would to. Other components are required only to setup the sprinkler system.

  • Components: -
  • Brand/Model: -
  • Description: -
  • Datasheet: -
  • JLCPCB: -