1st phase of project.

The first phase of the project consist 3 type of circuit. The first circuit is Power AC - DC circuit. Using transformers 9V @ 9VA step down, it will lower 240VAC from socket supply to 5VDC using LM7805. The output voltage is then connected to connector. From the connector, the circuit will then continue the sensor circuit. Below is the schematic diagram and PCB board layer.

Schematic Diagram Power AC-DC circuit

PCB Board Power AC-DC circuit

The second circuit is about ambient pollution measurement circuit. In this circuit, sensor MQ5 for circuit testing. The sensor MQ5 detect LPG. The actual sensor that we must use is air quality sensor. Unfortunately the sensor is late arrival due to online ordering, so for now MQ5 is use first. The MQ5 will detect density of the LPG. The density then translate from voltage to binary using ADC0804. The output from ADC have been put LED for easy reading the the LSB and MSB. Below is the schematic diagram and PCB board layer.

Schematic Diagram Ambient Pollution

PCB Board Ambient Pollution circuit

The third circuit is about wind speed measurement circuit. This is low cost circuit replacing high cost anemometer sensor.The concept of the circuit can be found at this website. The website explain the differentiation value between power diode create output that convert it into wind speed. Below is the schematic diagram and PCB board layer.

Schematic Diagram Wind Speed Sensor circuit

Schematic Diagram Wind Speed ADC circuit

PCB Board Wind Speed Sensor circuit

PCB Board Wind Speed ADC circuit

For the next post I'll write about how to construct this circuit from normal PCB board