Breathalyzer Microphone

Step 17 Finish soldering

On the side of the bracket upon which you inserted the resistors, insert the alcohol sensor.

Flip over the bracket. There are two groupings of three pins coming from the sensor.

For the first grouping of three pins, you are going to want to connect one of the outside leads from the resistors to one of the outside pins in the group. Then, you will need to solder the other resistor lead to the middle pin.

Once those connections are made you will need to solder the wires from the microphone. Solder the black wire also to the middle pin. If it is easier, you can also solder it to resistor lead connected to the middle pin.

Next, solder the red wire that is not connected to the power switch to the other outside pin that resistor lead is connected to.

Lastly, it is now time to connect the red wire coming from the power switch to the sensor. This wire gets connected to the grouping of three pins that you have yet to connect wires to (the one furthest from the resistors). Simply wrap this wire around either of the two outter pins and the center pin and then, in turn, solder it to the outter and center pin.