I²c and LCD Signal Interference resolution: Hardware engineers are hard to get up, so that the software engineer the head

The DEMO4,LCD CLK interference I2C,I2C cannot communicate.

Press the pin down to remove the CLK from the LCD and return to normal. Process: Direct jumper i²c, no problem. Two rows of pin are not able to communicate together. A row of needle removal, and finally found the LCD CLK line.  and I²c side-by line, causing interference. Solution: Add a resistor to the LCD's CLK to reduce interference.   can work properly. Other issues: The switch pin, top to the LCD cable, resulting in two plate a press-fit, voltage 0 (power lamp does not light), the current is very large (2A or more). Short-circuit---------------------------------------------------not finished, the last found when the problem of the backplane. It's normal to change the baseplate. Solve the idea, divided into several pieces, like a computer repair, first replace the exclusion method, determine the problem in which block, and then subdivide down.

I²c and LCD Signal Interference resolution: Hardware engineers are hard to get up, so that the software engineer the head