130-28176 Parallax Inc, 130-28176 Datasheet - Page 66
130-28176
Manufacturer Part Number
130-28176
Description
KIT PARTS PROCESS CONTROL
Manufacturer
Parallax Inc
Specifications of 130-28176
Accessory Type
Education Kit
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Board of Education Full Kit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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The pull-down resistor R
is not pressed, keeping it LOW. When the button is pressed, current flows through R
allowing a HIGH to be sensed on P8. The pull-down resistor should be sized to prevent
excessive current flow when the button is pressed.
Typical values for resistors used for this purpose are 1 kΩ, 10 kΩ or even 100 kΩ. A
minimum amount of current is required, typically several microamps.
I
R5
=V
R5
/R
5
= 5 V/10 kΩ = 0.5 mA
5
is used to force the input to a low voltage when the pushbutton
Figure 3-8
Active-High
Pushbutton with Pull-
Down Resistor
5
,
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