28128 Parallax Inc, 28128 Datasheet - Page 147

• Manufacturer Part Number: 28128
• Description: KIT BASIC ANALOG/DIGI PARTS ONLY
• Manufacturer: Parallax Inc

Specifications of 28128

• Accessory Type: ADC, DAC
• Product: Microcontroller Accessories
• For Use With/related Products: BASIC Stamp® 2 and Board of Education
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

What have I learned?
On the lines below, insert the appropriate words from the list on the left.
entire
analog
RC
buffer
voltage
divider
high
capacitor
The BASIC Stamp has a built in feature for D/A conversion that uses
pulse width modulation. The technique uses a series of pulses to charge
the capacitor in an __________ circuit to the desired voltage. PWM relies
on the duty, which is different from duty cycle, to control the voltage the
capacitor is charged to. Duty refers to a series of pulses instead of a single
cycle. It's the total amount of time the signal is __________ divided by
the total amount of time for the __________ pulse train.
it, the __________ will quickly loose its charge. A capacitor also looses
its charge due to leakage current, so the PWM should be repeated
periodically to refresh the voltage.
A photoresistor is a device whose resistance value changes with the
brightness of light that shines on a collecting surface. The photoresistor or
any resistor whose value changes with some analog value can be used in a
__________ and the result is a variable voltage output. This information
can be interpreted using the ADC0831 and the BASIC Stamp to measure
the __________ voltage output.
A __________ is essential for this circuit when driving a load. Without