ArduinoInABox

Features

• Arduino Pro Mini
• Detachable Human Interface design (HID)
• Flexible Input power
  • On-board DC/DC buck regulator allows 7-23V input
  • Direct 7-9V input (USE VRAW jumper)
  • 3.3V or 5V Arduino support
  • Measured 12 mA with 9V input and 3.3V Arduino Pro Mini
• I/O Boards
  • DB-25
• Mounts in a standard extruded Aluminum enclosure

Arduino Pro Mini

• Inexpensive and widely available
• Arduino Pro Mini Schematic
• I/O - 14 digital input/output pins (of which 6 can be used as PWM outputs)
  • Serial: 0 (RX) and 1 (TX).
    • Used to receive (RX) and transmit (TX) TTL serial data.
    • These pins are connected to the TX-0 and RX-1 pins of the six pin header.
  • External Interrupts: 2 and 3.
    • These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value.
    • See the attachInterrupt function for details.
  • PWM: 3, 5, 6, 9, 10, and 11.
    • Provide 8-bit PWM output with the analogWrite function.
  • SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK).
    • These pins support SPI communication, which, although provided by the underlying hardware.
  • LED: 13.
    • There is a built-in LED connected to digital pin 13.
    • When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.
  • 6 analog inputs
• On-board resonator (8 or 16 MHz)
• Reset button
• A six pin header can be connected to an FTDI cable provide USB power and communication to the board
• 3.3 or 5V
• 8 MHz (3.3V) or 16 MHz (5V)
• Programmable in Arduino IDE

Detachable Human Interface design (HID)

• OLED
  • 128x32 or 128x64
  • u8x8 driver - 6.2KB overhead
• Rotary Encoder with switch
  • Efficient bounce-less software
• Can leave attached to main board until installing in box

Input Power Options

• 2.1mm DC Power Connector Jack
• Mini360 Switching Mode Power Supply
  • Wide input voltage range
    • 5-23V (for 3.3V Arduino Pro Mini)
    • 7-23V (for 5V Arduino Pro Mini)
    • About $1
• Jumper to use raw input and not populate the Mini360
  • Uses the inputs jack as RAW power into the Arduino Pro Mini
  • 3.35-12 V (3.3V model) or 5-12 V (5V model)

RF Filters

• RF filter into Switching regulator board
• 2nd RF filter into HID card

Connectors

J1 - OLED

• Pinout

1. SDA
2. SCL
3. +VCC
4. GND

J2, J4 - On Base and HID card(s)

• Can detach HID to mount in box
• Pinout

1. GND
2. ENCODER A
3. ENCODER B
4. ENCODER SWITCH
5. I2C_SCL
6. I2C_SDA
7. VCC
8. GND

J4, J7, J8 - BNC/SMA input headers

• Connect here to use the BNC or SMA jacks on the rear (option)

J5 - Arduino Pins

• 2x13 header

J6 - Voltage Adjustment

• Adjust voltage for 3.3V or 5V to match Pro Mini voltage before installing jumper

J9 - Use Raw Power

1. DC_FILT (top pin)
2. VRAW (bottom pin)

FTDI (on Arduino Pro Mini)

• Used to download program to Arduino Pro Mini

Human Interface (HID)

• OLED
• Rotary Switch with Pushbutton
• Detachable board
  • Can be mounted to Front Panel of enclosure

OLED

• 0.91" 128x32 or so rotary switch (installed in SW1 location) is to the right
• 0.96" 128x64 (rotated) with rotary switch (installed in SW1 location) below
• SSD1306 family of displays
• Connections to Arduino Pins
  • A4/SDA
  • A5/SCL

Rotary Encoder

• Connections to Arduino Pins
  • A=P2
  • B=P3
  • Switch=P4

I/O Boards

• Base board has 3 optional BNC (P1-P3) or edge launch SMA (P4-P6) connectors
  • Brought to headers (J4, J7, J8)
• Easy to application specific custom I/O cards
  • All Arduino pins brought to J5 - 2x13 pin header
  • I/O pins are on 0.1" grid for easier prototyping
  • P2-P13, A0-A3
  • A4/A5 or SDA/SCL (connects to OLED)
• Location of mounting holes

DB-25 Example

• • DB25 pass-through
• Standard DB-25 female
  • Does not have 26 pin of the 2x13 header in the box
    • OK, extra powers/grounds at the ends
  • Connect with 1:1 cables to 2x10/2x3 Dupont receptacles

Mechanicals/Enclosure

• Board is designed to fit into Aluminum Project Box Enclosure DIY 100*76*35mm - ebay search

Schematic

• ArduinoInABox Rev 2 Schematic

Test

• Test code - OLED/Rotary Switch Test
• If there is no display on OLED, verify OLED appears at expected I2C address with I2C scan at I2C address 0x3C
  • Expect results

Scanning...
I2C device found at address 0x3C  !
done

• May require a different constructor
  • I used

U8X8_SSD1306_128X32_UNIVISION_HW_I2C u8x8(U8X8_PIN_NONE);

• • Your mileage may vary

Software

GitHub Repository

• GitHub Repository
• OLED/Rotary Switch Test - Good starting point
  • Uses Rotary Encoder Tutorial - best code is at the ends under "Code For Improved Table Decode"
• BounceLEDs - Bounce an LED across pins D5-D13 and A0-A3
  • A0 = D14
  • A1 = D15
  • A2 = D16
  • A3 = D17
• Menu Demo Code - Select between menu options

Total Memory usage with u8x8 Library and Rotary Encoder Code

• OLED/Rotary Switch Test
• Arduino bootloader uses up 2048 bytes of Flash

Sketch uses 7062 bytes (22%) of program storage space. 
Maximum is 30720 bytes.
Global variables use 475 bytes (23%) of dynamic memory, 
leaving 1573 bytes for local variables. Maximum is 2048 bytes.

Minimal u8x8 code

• Minimal U8X8Test code
• u8x8 olikraus Library
• u8x8 Reference Guide

Sketch uses 6198 bytes (20%) of program storage space. Maximum is 30720 bytes. Global variables use 446 bytes (21%) of dynamic memory, leaving 1602 bytes for local variables. Maximum is 2048 bytes.

Download/Programming

• FTDI cable
  • FTDI jumper is set to 3.3V
  • Power wire is not used
  • Other connections are 1:1

IDE setup

• Board: Arduino Pro or Pro Mini
• Processor: ATMega328P (3.3V, 8 MHz)

3D

Assembly Instructions

• ArduinoInABox Assembly Instructions Rev 1