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Step 4Solder the circuit (VOC sensor)
This is the trickiest part of the project. All connections must be very solid or they will fracture from the movements of the balloon. I recommend lot's of heat shrink or electric tape around each joint.
Solder the pic socket (not the pic itself to allow easier programming). Leave about 6 inch wires between the LED and the picaxe. Solder the picaxe, sensor and battery close together.
Sensor Pins
1 - ground (this could be the battery ground or the picaxe ground)
2 - picaxe pin 4, with a 10K resistor across ground
3 & 4 - VCC (this could be the picaxe VCC or the battery VCC)
LED Pins
Green - picaxe 1
Red - picaxe 2
Solder the pic socket (not the pic itself to allow easier programming). Leave about 6 inch wires between the LED and the picaxe. Solder the picaxe, sensor and battery close together.
Sensor Pins
1 - ground (this could be the battery ground or the picaxe ground)
2 - picaxe pin 4, with a 10K resistor across ground
3 & 4 - VCC (this could be the picaxe VCC or the battery VCC)
LED Pins
Green - picaxe 1
Red - picaxe 2
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