Data Sheet

LABCENTER ELECTRONICS LTD.
106
J1 and J2 placed with the CRC showing 1 connection missing
A missing connection is essentially a wire connection on the schematic that has not been routed
on the layout. It follows that when the board is completed the connectivity status should report
no missings. We'll look at this is more detail when we discuss routing later in the tutorial.
If we now consider the other principle components we can go ahead and place U1 (dsPIC33),
U2 (I2C memory), U3 (temp/humidity sensor) and U4 (dual op-amp) in exactly the same way,
such that we end up with something like the following screenshot.
dsPIC33 board so far...
Note that the S08 footprints used for the U2, U3 and U4 components have been rotated
appropriately to reduce ratsnest length. This is best done at placement time as the ratsnest
display will update live to give visual guidance.
Start by placing U1 in the normal way and then start placement of U2 by left clicking once on
the Editing Window. Now use the ‘+’ and ‘-‘ keys on your numeric keypad to rotate the
component as you move it into position, left clicking the mouse again to commit placement as
before. Repeat the process for U3 and U4, moving or rotating parts after placement (right click
and then context menu options) until your board approximates the previous screenshot.