OLIMEX MOD-IO User Manual page 15

AIN-2
Please note that the analog inputs by default are as big as the input levels but you might change this.
Just calculate (and mount/replace) the needed resistors R23/R24 and R25/R26.
PWR_J
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Pin # Signal Name Connected to
1 AN3 (ADC5)PA5
2 AN4 (ADC4)PA4
3 AGND Analog GND
Pin # Signal Name
1 Power Input
2 GND
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