# Arduino Opta I2C and Serial Aux Breakout Adapter

Breakout for aux port pins on Arduino Opta, including: I2C, serial, 3.3V, 5V, & GND plus board edge connector

- **Seller:** [JC Devices](https://www.lectronz.com/stores/jcdevices), Palm Harbor, Florida, United States
- **Price:** $16.95 (USD, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Arduino, I2C
- **Product page:** https://www.lectronz.com/products/arduino-opta-i2c-and-serial-aux-breakout-adapter

## Options

**2-pac**

- 2-pac [Add $7.00]
- 1-pac

**OLED Screen(s)**

- No OLED screen(s)
- Include OLED screen(s) [Add $7.00]

## Links

- [Design Files](https://github.com/JeremySCook/PCBs/tree/main/OptaAuxBreakout)

## Images

![Arduino Opta I2C and Serial Aux Breakout Adapter](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NDU1OTEsInB1ciI6ImJsb2JfaWQifX0=--4aa262125ca544ebcd53007d58cf7d4ea9ba4650/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJwbmciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--605f1da017bcbb03ce31845cd0e81d97e3b3c574/2024-09-30T18-52-58.028Z-image1.png)
![Arduino Opta I2C and Serial Aux Breakout Adapter](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NDU1OTIsInB1ciI6ImJsb2JfaWQifX0=--8774d6887c1539229cd90e60b9c9251f0bb12bb9/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJKUEciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--a1419a086f227676aca33a49760ac51e58b523e3/2024-09-30T18-39-26.482Z-DSC08149.JPG)

## Description

#### What is it?

Behind the Arduino Opta's AUX tab there are pads for interfacing with I2C and serial. These are not easily accessible, so this kit includes board + edge connector to break them out.

#### Why did you make it?

I was considering using a MIDI interface with the Arduino Opta. I still may as since I can now access UART, MIDI is also possible and has worked well as an input in preliminary testing.

#### What makes it special?

It's a simple breakout, but it's a unique device. It's good for experimentation, but certainly not appropriate for any sort of critical or harsh environment that you'd traditionally use a PLC for. Use at your own risk.

Of course, if you've seen some of the cabinets out there, a lot more kludgy stuff goes on than should be the case. Use responsibly. Also, it would seem the chip is a 3V3 device, so I highly suggest using that voltage level for interfacing, not 5V.

#### Other Details:

- Labels are accurate with respect to the AUX out, but will be incorrect if used on the input side of an expansion module. 
- New version includes offset pins for SSD1306 OLED screen or other devices, which you can optionally include. - I2C output tested with base module as well as SSR expansion.
- Simple I2C [examples with SSD1306](https://github.com/JeremySCook/arduino-experiments/tree/main/opta/serial-I2C-breakout)
- [Example taking in MIDI signals](https://github.com/JeremySCook/arduino-experiments/tree/main/MIDI/AutoDrums) via the adapter and displaying the pitch value on an SSD1306 (SSR expansion module + this AUX adapter)
- Options for 1-pac or 2-pac include 1 or 2 of entire kit respectively, and one OLED screen will be included for each kit purchased IF that option is selected. I.e. select 2-pac and OLED option, receive 2 boards, 2 adapters, 2 OLED screens. Select 1-pac and OLED option, receive 1 board, 1, adapter, 1 OLED screen.
- OLED screens are slightly different than pictured per a new design & may use white text.
- Please let me know if you have any questions or comments - hi@jeremyscook.com - PCB design files linked may not be the most current version.