To connect an analog sensor to the iSIC that does not exist in the iChart's sensor library, please follow the steps beleow:
1) In iChart, go to the Sensor step and select Generic from the drop down menu. Select Generic mV in the menu below. Click Add.
2) On the “Analog Sensor Property”, enter the full scale. Please note that the full scale mV is the voltage after being divided. For example, if your sensor is measuring temperature from 0 to 50C and your mV output is 0 to 5V, after divide the 5V in half, you will enter 2500mV (2.5V) in iChart.
For a 10V sensor, you would connect the same way as a 5V sensor except that one resistor is 10K and the other is 30K between the ADx AGND terminals. You need to divide any signal higher than 2.5V to 2.5V or less. The connection is always as followed:
<signal>----------------R1---------|-------ADx
|
R2
|
----------AGND
To calculate the full scale mV, use the formula
ADx = signal * (R2 / (R2+R1) )
Example:
If R2 = R1 = 10K and signal = 5V then ADx = 5 * (10 / (10+10) ) = 2.5V
If R2 = 10K, R1 = 30K and signal = 10V then ADx = 10 * (10 / (10+30)) = 2.5V
If you don’t have the exact resistor value, it is OK as long as your ADx is less than or equal to 2.5V. For example
If R2 = 10K, R1 = 33K and signal = 10V then ADx = 10 * (10 / (10+33) ) = 2.326V. You then enter 2326mV in iChart full scale mV.
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