week 10

construct in  PCB

So after we have done with our software arduino and test in bread board  last week, now we are going to do the next process of putting our circuit on Printed Circuit Board(PCB). In this process, we required to follow every step on doing the PCB.

step 1 we used software  pcb express to construct pcb circuit  

  next step is we print use  the Overhead Projection Paper (OHP) and PCB layout on this paper using laser jet printer 

PCB UV Exposure, In this process, we are going to exposed our PCB to the Ultraviolet using a UV Box. For this particular process, what we have to do is we stick our PCB layout that we already printed on OHP paper to this PCB board. Then we put this PCB board in the machine and set the time to 60 seconds. Then wait till the process finished

next is we etching the PCB board

  
 ,After etching, what we're going to do is we are going to drilling our PCB in order to place the component on the board before we can go to the soldering process. We are using a cordless drill with drill point size 1.0 mm. For safety precaution we put a Styrofoam as a pad for our PCB. We have to do it with gentle and precise because the size of the components pin is to small. By using my own cordless drill I'll start drilling all the pin for every components.

 

last step is after we drill, Now we can start solder all the component. First put the component on the PCB and make sure that the components are in the correct position. Then switch on the soldering iron and wait for 5 minutes in order to make sure that the soldering iron is heat enough. Then put the PCB on the PCB holder so that we can easily doing the solder without having a difficulty during the process. Now we can start solder. During this work, make sure that we not put the soldering iron too long on the PCB because if too long we might give the burn to our PCB and it will damage our PCB. If we want to desolder, we have to use desolder pump to suck the lead. Then use the solder wick to clean the tip of soldering iron.