dS1242
dS1242 User Manual v4.10
Analogue inputs
Two independent analogue input channels of 10-bit resolution are provided for sampling volt-
ages up to 3.3V. Each channel is also filtered with a 10k resistor and a 100n capacitor to sta-
bilise high frequency jitter, there is also a pull down resistor so the port will read around 0
when nothing is connected. 5V inputs can be used, although the 3.3V to 5V region will merely
read full scale.
Examples
Example input - connecting a poten-
tiometer
Connecting a potentiometer should be the
simplest of tasks, either end of the pot should
be wired to the 5v and 0v respectively, the
output pin of the pot is then wired into the
analogue (A) pin. Please note the reading
from the conversion will reach maximum at
3.3V.
Representative Analogue Schematic
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