28176 Parallax Inc, 28176 Datasheet - Page 63
28176
Manufacturer Part Number
28176
Description
KIT PARTS PROCESS CONTROL W/TEXT
Manufacturer
Parallax Inc
Datasheet
1.122-28176.pdf
(330 pages)
Specifications of 28176
Accessory Type
Process Control
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
BASIC Stamp® 2 and Board of Education
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Challenge 3-2: Photographic Darkroom Alarm
ACTIVITY #3: UNCOMMITED INPUTS AND CONDITIONING SWITCHES
An uncommitted input is one not dedicated to a voltage potential, is said to be “floating”
and may not be sensed by the BASIC Stamp as a definite logic HIGH or LOW. Simply
connecting a mechanical switch between the input and Vdd leaves the input floating
when the switch is open. Current flow to Vdd or Vss is necessary to “commit” the input
(when in the open condition). This exercise will help make this concept clear.
Parts Required
(1) ADC0831
(2) Resistors – 220 Ω
(1) Resistor – 1 kΩ
(1) Resistor – 10 kΩ
(1) Pushbutton – Normally Open
(1) LED – Red
√
Modify the circuit to exceed the threshold when excess light falls on the sensor.
Draw your circuit modifications. Discuss settings and results.
Figure 3-5
Night-Light
Plot
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