122-28176 Parallax Inc, 122-28176 Datasheet - Page 65
122-28176
Manufacturer Part Number
122-28176
Description
GUIDE STUDENT PROCESS CONTROL
Manufacturer
Parallax Inc
Specifications of 122-28176
Accessory Type
Manual
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Propeller Education (PE) Kit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Figure 3-7 is a sample plot of the results.
When the pushbutton is pressed, current passes through the switch to register a solid
HIGH value. The input is now committed and no longer floating.
When the normally-open (N.O.) pushbutton is not pressed, the input to P8 is floating and
not committed to any voltage level. By touching the lead, the static electricity on your
body is creating voltage spikes on the input above the threshold voltage. This noise
causes the digital input to switch states. During process control, the uncommitted input
may cause erratic and undesirable conditions. Again, the monitored analog voltage and
digital input are not measured simultaneously and may not match HIGH and LOW values
exactly.
√
√
Place a 10 kΩ resistor from the P8 side of the pushbutton to Vss as shown in
Figure 3-8.
Test the circuit again. Are the results more stable?
Figure 3-7
Plot of
Uncommitted
Input
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