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<strong>Note:</strong> Check the inputs and outputs detailed sections below for more information about the Analog Expansion channels use.
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The PWM outputs are software configurable and for them to work you must provide the **V<sub>PWM</sub>** pin with the desired voltage between 8 and 24 VDC, you can set the period and duty-cycle by software.
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### Expansion Port
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The expansion port can be used to daisy-chain several Opta® Expansions and additional modules. To be accessed needs to be freed up from its breakable plastic cover and the connection plug added between each device.
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The expansion port can be used to daisy-chain several Opta® Expansions and additional modules. To access it, it needs to be freed from its breakable plastic cover, and the connection plug needs to be added between each device.
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It supports up to 5 expansion modules. To avoid potential communication issues, ensure the total number of connected modules does not exceed 5.
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If any issues occur with module detection or data exchange, double-check the connections and ensure the **Aux connector and clips are securely installed** within the expansion port. If problems persist, inspect for any loose or improperly connected cables.
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## Device Operation
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### Getting Started - IDE
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### Expansion Port
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The expansion port can be used to daisy-chain several Opta® Expansions and additional modules. To be accessed needs to be freed up from its breakable plastic cover and the connection plug added between each device.
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It supports up to 5 expansion modules. To avoid potential communication issues, ensure the total number of connected modules does not exceed 5.
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If any issues occur with module detection or data exchange, double-check the connections and ensure the **Aux connector and clips are securely installed** within the expansion port. If problems persist, inspect for any loose or improperly connected cables.
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## Device Operation
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### Getting Started - IDE
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If you want to program your Arduino Opta® Digital Expansions while offline you need to install the Arduino® Desktop IDE **[1]** and the Arduino_Opta_Blueprint using the Library Manager. To connect the Arduino Opta® to your computer, you will need a USB-C® cable.
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<td>4.2 supported by firmware, 5.1 supported by hardware</td>
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</tr>
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The relays on Arduino Opta® provide a very fast response time of 6/4 ms to change state for closing/reopening, and a bounce time NO/NC of 3/6 ms.
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### Expansion Port
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The expansion port can be used to expand the Arduino Opta® capabilities with the help of additional modules. Reserved for future functionality.
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The expansion port can be used to expand the Arduino Opta® capabilities with the help of additional modules. It supports up to 5 expansion modules. To avoid potential communication issues, ensure the total number of connected modules does not exceed 5.
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If any issues occur with module detection or data exchange, double-check the connections and ensure the **Aux connector and clips are securely installed** within the expansion port. If problems persist, inspect for any loose or improperly connected cables.
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### Programmable User Button
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A pushbutton is accessible on the front panel of the Arduino Opta®. The functionality of this button can be configured via software. Note that the LED above the *User button* is only available on Arduino Opta® WiFi (AFX00002).
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***The expansions must be externally powered to be operated and detected by the Opta™ controller.***
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***The Opta™ controller module supports a maximum of __5 expansion modules__. Exceeding this limit may cause unexpected behavior. __Ensure no more than five modules are connected, and verify that the Aux connector and clips are securely installed__.***
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#### Programmable Inputs
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The Opta™ Expansions have **16x analog/digital programmable inputs** accessible through terminals `I1` to `I16`.
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***The Opta™ controller module can support up to __5 expansion modules__. Connecting more than this may result in unexpected behavior. __Ensure the module limit is not exceeded and the Aux connector and clips are properly secured.__***
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You can buy and find more information about the Opta™ Digital Expansions on the links below:
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-[Opta™ Digital Expansion Product Page](https://docs.arduino.cc/hardware/opta-digital-ext)
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***The expansions must be externally powered to be operated and detected by the Opta™ controller.***
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***The Opta™ controller module supports a maximum of __5 expansion modules__. Exceeding this limit may cause unexpected behavior. __Ensure no more than five modules are connected, and verify that the Aux connector and clips are securely installed__.***
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#### Programmable Inputs
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The Opta™ Analog Expansion has 8x analog channels, identified with a letter, `I` or `O`, between the two connection terminals: `+` for signal and `-` as GND, common to the other `-` terminals on the board.
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The function `optaAnalogTask()` turns on sequentially the **LEDs** and turns them off again.
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***The Opta™ controller module can support up to __5 expansion modules__. Connecting more than this may result in unexpected behavior. __Ensure the module limit is not exceeded and the Aux connector and clips are properly secured.__***
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You can buy and find more information about the Opta™ Analog Expansions on the links below:
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-[Opta™ Analog Expansion Product Page](https://docs.arduino.cc/hardware/opta-analog-ext)
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### Snapping the Expansion
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You can connect up to five expansions to your Opta™ controller module to multiply and diversify your I/O set with seamless detection.
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You can connect up to **five expansions to your Opta™** controller module to multiply and diversify your I/O set with seamless detection.
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Remove the breakable plastic cover marked as AUX from the expansion port on the Opta™ controller and the expansion module to expose the ports.
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***The Opta™ controller module supports a maximum of __5 expansion modules__. Exceeding this limit may cause unexpected behavior. __Ensure no more than five modules are connected, and verify that the Aux connector and clips are securely installed__.***
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