The Requisition Form
First order:
1. Arduino Mega 61,44€
2. Linear Active Thermistor (Analogue) 4€
3. Humidity Sensor (Analogue) 16,95€
4. MQ-3 Ethanol Sensor 4,95 €
Sum: 87,34€ + Porto (high porto for the MQ-3 since its from USA)
After the first order form was declined due to high expenses a cheaper way had to be found.
The solution is to order the MQ-3 sensor from a store in the UK which is called cool components this will will result in cheaper porto costs. The second step was to combine the temperature sensor and the humidity sensor into a cheap all together sensor. The sensor is called DFN6 and is an I2C sensor this will require more work and research but the Arduino is capable of handling the I2C bus.
New order:
1. Arduino Mega 61,44€
2. Sensor Humidity & Temp DFN6 (I2C) 19,05€
3. Ethanol Sensor MQ-3 5,92£ = 6,97€
Sum : 87,46€ + Porto ( porto for the MQ-3 will be cheaper and faster)