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 of 5V Arduino support
• 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
• 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

• Wide input voltage range
  • 5-23V (for 3.3V Arduino Pro Mini)
  • 7-23V (for 5V Arduino Pro Mini)
• 2.1mm DC Power Connector Jack
• RF filter into Switching regulator board
• 2nd RF filter into HID card
• Mini360 Switching Mode Power Supply
  • 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)

I/O Boards

• Arduino pins brought to 2x13 header
  • I/O pins are on 0.1" grid for easier prototyping
  • P2-P13, A0-A3
  • A4/A5 or SDA/SCL
• Easily designed
• 3 BNC or SMA connectors
  • Brought to headers
  • DB25 pass-through

Connectors

J2 - On HID

J3 - On base board

J6 - Voltage Adjustment

• Adjust voltage for 3.3V or 5V with jumper not installed

J5 - Arduino Pins

J9 - Use Raw Power

DB-25 Example

• DB25-02
• Standard DB-25 female
  • Misses 1 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

• VFO-003 - Similar in a box

Software

• GitHub Repository - VFO-003
• Minimal Viable Product build - GitHub repo

Memory Usage

• Minimal Viable Product Build - GitHub repo branch
• Arduino bootloader 2048 of Flash
• Display code: 10260 of Flash and 1033 of SRAM using u8g2
• Alternate display code: 6198 of Flash and 446 of SRAM using u8x8
• Si5351 code: 12076 of Flash and 378 of SRAM

Total Memory usage with u8g2 Library

Sketch uses 25970 bytes (84%) of program storage space. Maximum is 30720 bytes. Global variables use 1503 bytes (73%) of dynamic memory, leaving 545 bytes for local variables. Maximum is 2048 bytes.

Total Memory usage with u8x8 Library

• ~4K less than the u2g2 library

Sketch uses 22064 bytes (71% of program storage space. Maximum is 30720 bytes. Global variables use 925 bytes (45%) of dynamic memory, leaving 1142 bytes for local variables. Maximum is 2048 bytes.

Minimal u8g2 code

• Minimal u8g2Test code
• olikraus u8g2 Library

Sketch uses 10260 bytes (33%) of program storage space. Maximum is 30720 bytes. Global variables use 1033 bytes (50%) of dynamic memory, leaving 1015 bytes for local variables. Maximum is 2048 bytes.

• Code

void setup(void)
{
  u8g2.begin();

}

void loop(void)
{
  printStringToOLED("VFO-003");
}

void printStringToOLED(char * charStr)
{
  u8g2.clearBuffer();
  u8g2_prepare();
  u8g2.drawStr( 0, 0, charStr);
  u8g2.sendBuffer();
}

// u8g2_prepare()
// Setup the screen font, etc
// List of fonts
// https://github.com/olikraus/u8g2/wiki/fntlist8#u8g2-fonts-capital-a-height-38
void u8g2_prepare(void)
{
  u8g2.setFont(u8g2_font_t0_11b_tf); // 8 Pixel tall font
  u8g2.setFontRefHeightExtendedText();
  u8g2.setDrawColor(1);
  u8g2.setFontPosTop();
  u8g2.setFontDirection(0);
}

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.

• Code

// https://github.com/olikraus/u8g2/wiki/u8x8reference#c-example

#include <Arduino.h>
#include <SPI.h>
#include <U8x8lib.h>

#define U8X8_HAVE_HW_I2C

U8X8_SSD1306_128X32_UNIVISION_HW_I2C u8x8(U8X8_PIN_NONE);

void setup() {
  // put your setup code here, to run once:
  u8x8.begin();
}

void loop() {
  // put your main code here, to run repeatedly:
  u8x8.setFont(u8x8_font_victoriabold8_r);
  u8x8.drawString(0,0,"Hello World!");
  delay(1000);

}

Assembly Instructions

• ArduinoInABox Assembly Instructions Rev 1