OLIMEX© 2020
MOD-IO user's manual
5.7.1 IN1, IN2 IN3, IN4 – digital inputs with opto-isolators
Pin #
Signal
1
-
2
+
IN1 connected to (T0)PB0 – signal I4
IN2 connected to (T1)PB1 – signal I3
IN3 connected to (AIN0/INT2)PB2 – signal I2
IN4 connected to (INT1)PD3 – signal I1
The digital inputs high position would typically mean input signal is in the (3-24)V range.
The digital inputs low position would typically mean input signal in (0-1)V range.
5.7.2 OUT1, OUT2, OUT3, OUT4 – digital outputs
The digital outputs are controlled by the big orange relays on the top of the board.
OUT1 connected to (ADC3)PA3 – signal name O4
OUT2 connected to (ADC2)PA2 – signal name O3
OUT3 connected to (ADC1)PA1 – signal name O2
OUT4 connected to (ADC0)PA0 – signal name O1
5.7.3 AIN-1 and AIN-2 – analog inputs
The analog inputs are located on two connectors that are placed next to each other. The connectors are
named AIN-1 and AIN-2.
AIN-1
Pin #
Signal Name
Connected to
1
3.3V
VCC
2
AN1
(ADC7)PA7
3
AN2
(ADC6)PA6
AIN-2
Pin #
Signal Name
Connected to
1
AN3
(ADC5)PA5
2
AN4
(ADC4)PA4
3
AGND
Analog GND
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