7. Bill of Material
The total cost of this project is around $90. This is highly dependent on the source of your parts. The cost does not include the exhaust fan, since it is usually embedded in buildings. To now more about part costs check Applications and Implications week.
7.1. Carbon Monoxide Monitoring Unit (COM)
| Part |
Value |
Package |
Qty. |
| Voltage regulator |
3.3V, 1A |
SOT223 |
1 |
| Voltage regulator |
5V, 1A |
SOT223 |
2 |
| Resistor |
0 Ohm |
R1206FAB |
6 |
| Resistor |
50 Ohm |
R1206FAB |
1 |
| Resistor |
100 Ohm |
R1206FAB |
2 |
| Resistor |
1 kOhm |
R1206FAB |
1 |
| Resistor |
10 kOhm |
R1206FAB |
5 |
| Capacitor |
0.1 uF |
C1206FAB |
6 |
| Capacitor |
1 uF |
C1206FAB |
1 |
| Capacitor |
10 uF |
C1206FAB |
3 |
| Diode |
Schotkky |
MINI-SMA |
2 |
| MOSFET-N |
NDS355AN |
SOT-23 |
2 |
| Microcontroller |
ATmega328 |
TQFP32-08THIN |
1 |
| Wireless module |
NRF24L01+ |
2x04_THRU |
1 |
| Power connector |
Jack 2.1mm |
PJ-002AH-SMT |
1 |
| LCD module |
2x16 |
TUXGR_16X2_R2 |
1 |
| Buzzer |
5V magnetic |
F/TMB |
1 |
| CO sensor |
MQ-7 |
MQ-7 |
1 |
| Pinhead |
2x2-M |
2x02SMD |
6 |
| Pinhead |
ISP-M |
2x03 |
1 |
| Pinhead |
2x3-M |
2x03SMD |
2 |
| Pinhead |
2x4-M |
2x04SMD |
1 |
| Pinhead |
1x2-F |
1x02 |
2 |
| Pinhead |
1x8-F |
1x08 |
1 |
| Pinhead |
1x16-F |
1x16 |
1 |
| Header |
2x2-F |
2x02 |
6 |
| Header |
2x3-F |
2x03 |
2 |
| Header |
2x4-F |
2x04 |
2 |
| Material/Item |
Qty |
| FR4 single layer PCB |
104 mm x 79 mm |
| 1x10 cable for header |
15 cm |
| Power Adaptor 12 VDC, 1A |
1 pcs. |
| 220 VAC exhaust fan |
1 pcs |
| PLA filament for case |
123 gm |
| Part |
Value |
Package |
Qty. |
| Resistor |
1 kOhm |
R1206FAB |
7 |
| LED |
Red |
LED1206FAB |
3 |
| LED |
Orange |
LED1206FAB |
2 |
| LED |
Green |
LED1206FAB |
2 |
| Pinhead |
1x8-M |
1x08 |
1 |
| Material |
Qty |
| FR4 single layer PCB |
47 mm x 19 mm |
| Part |
Value |
Package |
Qty. |
| Resistor |
10 kOhm |
R1206FAB |
2 |
| Push button |
Tactile 6 mm |
6MM_SWITCH |
2 |
| Pinhead |
1x2-M |
1x02 |
2 |
| Material |
Qty |
| FR4 single layer PCB |
31 mm x 13 mm |
7.2. Exhaust Fan Control Unit (EFC)
7.2.1. EFC Board
| Part |
Value |
Package |
Qty. |
| Voltage regulator |
3.3V, 1A |
SOT223 |
1 |
| Voltage regulator |
5V, 1A |
SOT223 |
2 |
| Resistor |
0 Ohm |
R1206FAB |
3 |
| Resistor |
10 kOhm |
R1206FAB |
1 |
| Capacitor |
0.1 uF |
C1206FAB |
7 |
| Capacitor |
1 uF |
C1206FAB |
1 |
| Capacitor |
10 uF |
C1206FAB |
3 |
| Microcontroller |
ATmega328 |
TQFP32-08THIN |
1 |
| Wireless module |
NRF24L01+ |
2x04_THRU |
1 |
| Relay module |
Single |
1x03_THRU |
1 |
| Power connector |
Jack 2.1mm |
PJ-002AH-SMT |
1 |
| Pinhead |
1x3-M |
1x03 |
1 |
| Pinhead |
2x2-M |
2x02SMD |
4 |
| Pinhead |
ISP-M |
2x03 |
1 |
| Pinhead |
FTDI-M |
1x06 |
1 |
| Pinhead |
2x4-M |
2x04SMD |
1 |
| Pinhead |
1x4-F |
1x04 |
1 |
| Header |
2x2-F |
2x02 |
6 |
| Header |
2x4-F |
2x04 |
2 |
| Material/Item |
Qty |
| FR4 single layer PCB |
70 mm x 73 mm |
| 1x10 cable for header |
10 cm |
| Terminal block 4-pos |
1 pcs, |
| Power Adaptor 12 VDC, 1A |
1 pcs. |
| PLA filament for case |
117 gm |
7.2.2. EFC LEDs Module
| Part |
Value |
Package |
Qty. |
| Resistor |
1 kOhm |
R1206FAB |
3 |
| LED |
Red |
LED1206FAB |
1 |
| LED |
RGB |
P-LCC-4 |
1 |
| Pinhead |
1x4-M |
1x04 |
1 |
| Material |
Qty |
| FR4 single layer PCB |
22 mm x 13 mm |