Week 11

After complete my software which is application on Android, I move to another part to complete my project.  This week I spend my time to complete circuit part which is PCB board and testing. The PCB board etching was done at BMI lab.

Here is the step for beginning to the end of process to do in PCB board.

1.Sketch the circuit in software and print on OHP paper.

    Figure 1: Design using Fritzing software

    Figure 2: Printed on OHP paper

2.Expose in UV lamp

    Figure 3: set expose for 72 seconds

    Figure 4: Put the UV board into UV box

3. Remove the green layer

   Figure 5: shake the box until the green layer disappear

    Figure 6: The green layer disappear and only line for circuit left

4. Remove the gold layer by put the circuit into ecthing machine

Figure 7: run the machine 2~3 times until fully disappear

5. When all complete, using thinner to clear the PCB board and only copper line left .