Custom Raspberry Pi Interfaces by Warren Gay

Author:Warren Gay
Language: eng
Format: epub
Publisher: Apress, Berkeley, CA

Figure 8-2 shows that there is a contact pad (lower left) for the wiper arm. The top portion (right side of the figure) shows the other contact points. The smear seen there is some conductive grease. Figure 8-3 illustrates the wiper half of the assembly.

Figure 8-3.The wiper assembly of the rotary encoder

The photos illustrate the cheap nature of the rotary encoders’ construction. They must go through some sort of quality control at the factory, but it wouldn’t take much more than a bent wiper arm to render one faulty.

Figure 8-4 shows the KY-040 schematic without the optional push button switch. The units with the optional push switch have another connection labeled “SW” on the PCB. The return side of that switch connects to ground (GND).

Figure 8-4.The KY-040 schematic (excluding optional push switch)

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.