0x0F: 8 ch Taguchi gas sensor array DN100

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Background

Please see the e-nose project page for an elaborate description as well as practical examples.

Function

This PCB breaks out the connections to eight Taguchi type gas sensors and effectively forms an array of sensors; the sensor part of an electronic nose.

The board will accomodate both the more expensive 6-pin Figaro Engineering-type gas sensors as well as the cheaper 6-pin products from e.g. HW Sensor. Sensor responses as well as MOSFET driver signals are carried either on a 20-way IDC cable or on a 10-way IDC cable, if sensors are excitated with a common voltage supplied to the screw terminals.

License terms
The 0x0F design is published under the Creative Commons Unported 3.0 License.  I do not profit from this design, neither should you. You are welcome to adapt, modify, and redistribute this design as long as the license terms are respected.

Physical size of PCB

Circular, 100 mm (diameter). Double-sided.

Rendering and photos

 

DipTrace 3D rendering, frontside without components (rev. 5)

 

DipTrace 3D rendering, frontside without components (rev. 5)

 

DipTrace 3D rendering, backside  with components (rev. 5)

 

Photo of PCB frontside, SMD components mounted (rev. 5)

 

Photo of PCB frontside, SMD components and connectors mounted (rev. 5)

 

Photo of PCB frontside, IDC cable mounted (rev. 5)

 

Photo of PCB backside, sockets and sensors mounted (rev. 5)

 

Photo of a gas proof flow cell made from a 30 flask ounze double-wall metal canister (rev. 6)

 

Bill of materials

8 pcs. Taguchi gas sensor socket, 6-pin

8 pcs. Taguchi gas sensor

8 pcs. MOSFET, IRLML2502, logic-level N-channel, form factor SOT-23

8 pcs. gate-current limiter, 100R, form factor 1206

8 pcs. pull-down resistor, 10k, form factor 1206

8 pcs. flyback biode, BAS32L, form factor mini-MELF

2 pcs. 10-pin header

8 pcs. resistor, form factor 1206

8 pcs. zero-ohm resistor, PWM bypass, form factor 1206

1 pcs. two-way screw terminal, 5.08 mm pitch

1 pcs. ceramic capacitor, decoupling, 100 nF, 1206

1 pcs. 6-way male header, 2.54 mm pitch (breakout for BME280 module)

1 pcs. 6-way female header, 2.54 mm pitch (attaches to BME280 module)

1 pcs. 20-way IDC connector

1 pcs. resistor, 715R (current limiter for LED)

1 pcs. LED, PLCC-2

2 pcs. Festo snap-connector for ø = 4 mm poluyrethane tube

4 pcs. O-ring, 7 mm inner diameter

2 pcs. nut, 7 mm

 

Estimated cost

Eight Taguchi gas sensors, two 2×4 connectors, and eight trimpotentiometers should not cost more than EUR 10,- depending on the type of sensors. The analogue-to-digital converter can be pricy, but it gives immense flexibilty, when monitoring remote locations.

Downloads

Schematic (PDF): 0x0Frev5-schematic

DipTrace v. 3 schematic file: 0x0Frev5-schematic

DipTrace v. 3 PCB design file: 0x0Frev5-ratlined-public

Gerber files: 0x0Frev5

 

Sensor datasheet, HW Sensor: MQ-2

Sensor datasheet, HW Sensor: MQ-3

Sensor datasheet, HW Sensor: MQ-4

Sensor datasheet, HW Sensor: MQ-5

Sensor datasheet, HW Sensor: MQ-6

Sensor datasheet, HW Sensor: MQ-7

Sensor datasheet, HW Sensor: MQ-8

Sensor datasheet, HW Sensor: MQ-9

Sensor datasheet, HW Sensor: MQ131

Sensor datasheet, HW Sensor: MQ135

Sensor datasheet, HW Sensor: MQ136

Sensor datasheet, HW Sensor: MQ137

Sensor datasheet, HW Sensor: MQ138

Links

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