Low cost Carbon Monoxide meter

2 months ago 142
  • Description
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  • BOM
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Description

Today Carbon Monoxide meters are available in different forms. Overall, Carbon Monoxide meters sense CO fast and display the amount to the user and trigger alarm if it reaches a critical level. Compare with most of the DIY Carbon Monoxide meters, the project which we described in this article does not need any development platform or MCU / firmware. The Carbon Monoxide meter in this project design around using general-purpose ICs, such as NE556 and LM3914.

The main component of this meter is the FC-22 CO Gas sensor module. This module consists of the MQ-7 sensor and can use to detect CO gas concentrations, anywhere from 10 to 10000ppm.

Apart from the sensor, this module consists of the LM393 comparator to detect the trigger level.

In this design, we use both analog and digital output of the sensor module. The analog output use by the LM3914 LED driver and alarm system is drive using the digital output.

The PCB of this meter designs as a single side PCB with dimensions of 102 mm x 39 mm. All the components used in this design are through-hole type components with generally available values.

After assembling the circuit, the trigger level of the alarm needs to adjust using the preset potentiometer available at the sensor module. The sensitivity of the LED array can change using the preset potentiometer (RV1) on the PCB.

This meter design to power using a 5V power supply unit. Before taking any measurements, run it for a few minutes to heat the sensor. For the testing and calibration, we use exhaust fumes coming from the tailpipe of the motor vehicle.

Documents

co-meter

PCB of Low cost Carbon Monoxide meter

BOM

ID Name Designator Footprint Quantity
1 LM3914N U2 DIP-18_W7.62MM_LONGPADS 1
2 100K RV1 POTENTIOMETER_PIHER_PT-6-V_VERTICAL 1
3 5.6K R1 R_AXIAL_DIN0204_L3.6MM_D1.6MM_P5.08MM_HORIZONTAL 1
4 3.9K R2 R_AXIAL_DIN0204_L3.6MM_D1.6MM_P5.08MM_HORIZONTAL 1
5 0.01MFD C1 C_DISC_D5.0MM_W2.5MM_P5.00MM 1
6 0.1MFD C2 C_DISC_D5.1MM_W3.2MM_P5.00MM 1
7 10K R3,R4 R_AXIAL_DIN0204_L3.6MM_D1.6MM_P5.08MM_HORIZONTAL 2
8 1K R5 R_AXIAL_DIN0204_L3.6MM_D1.6MM_P5.08MM_HORIZONTAL 1
9 68K R6 R_AXIAL_DIN0204_L3.6MM_D1.6MM_P5.08MM_HORIZONTAL 1
10 10MFD C3 CP_RADIAL_D5.0MM_P2.50MM 1
11 Buzzer BZ1 BUZZER_12X9.5RM7.6 1
12 GREEN-LED D1,D2,D3,D4,D5,D6,D7 LED_D3.0MM 7
13 YELLOW-LED D8,D9,D10 LED_D3.0MM 3
14 FC-22 J1 PINHEADER_1X04_P2.54MM_HORIZONTAL 1
15 4.7MFD C4 CP_RADIAL_D5.0MM_P2.50MM 1
16 DC-IN J2 BARRELJACK_HORIZONTAL 1
17 MUTE SW1 SW_PUSH_6MM 1
18 LM556 U1 DIP-14_W7.62MM_LONGPADS 1

Attachments

Filename Download
co-meter-14062020A.tar.xz

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