27220 Parallax Inc, 27220 Datasheet - Page 169
27220
Manufacturer Part Number
27220
Description
BOOK STAMPWORKS
Manufacturer
Parallax Inc
Datasheet
1.27220.pdf
(230 pages)
Specifications of 27220
Accessory Type
Booklet
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Not applicable / Not applicable
For Use With/related Products
StampWorks
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Not applicable / Not applicable
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A neat trick with DEBUG is used to display the variable, mVolts.
The DIG 3
operation prints the whole volts and the DEC3 modifier prints the fractional volts
(rightmost three digits).
Reconnect the circuit as shown below and rerun the program.
Now use a multimeter to measure the voltage between pins 2 and 3 of the ADC0831.
Note that when the voltage on pin 3 is higher than pin 2, the output will be zero.
Taking It Further
As stated earlier, the voltage-per-bit for the ADC output is determined by the voltage
applied to Vref. Reconnect the circuit as shown below, and set the voltage on the
Vref pin to 2.55 volts (confirm with a multimeter).
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