Open Data Acquisition System

Block Diagram

The Open Data Acquisition System consists of a Data Acquisition Processor (DAP) and up to 8 I/O cards.

The block diagram is:

Features

The Open Data Acquisition System features a powerful combination of Open Hardware and Open Software to access low level hardware interfaces from a Host Computer.

Open Hardware

• Support for standard microprocessors such as Arduino, Raspberry Pi, BeagleBone Black
  • ATMEGA32U4 Arduino Leonardo compatible Processor
• Industry-Standard USB Host Interface
• Industry-Standard I2C Bus Interface to cards
• ODAS card design specification
  • ODAS form factor is an open form factor which provides an inexpensive and small card size (approx 4" square)
  • Mix and match card types

Open Software

• USB Interface runs industry standard Firmata
• Processor card runs Arduino Leonardo compatible software
• Arduino "Wire" Standard I2C bit driver
• Community supported Python, C++, Ruby, LabView, VxWorks drivers

Personality EEPROM

• Based on Raspberry Pi Hat Spec

struct eep_vals
{
  char signature[4]; // "ODAS" in ASCII
  byte fmt_version;  // EEPROM data format version (0x00 reserved, 0x01 = first version)
  byte rsvd;         // set to 0
  short numatoms;    // set to 2
  long eeplen;       // set to 96 dec
  char uuid[16];     // "0000000000000000" in ASCII
  short pid;         // See PID table
  char vslen;        // set to 32 dec
  char pslen;        // set to 32 dec
  char vstr[32];     // Vendor Null terminated String
  char pstr[32];     // Product Null terminated String
};

Product ID Table

Signature=ODAS
Vendor=land.boards.com

ProductID (in hex)	Product (string)
1	DIGIO16-I2C
2	DIGIO128
3	OptoIn8-I2C
4	OptoOut8-I2C
5	DIGIO32-I2C
6	PROTO16-I2C
7	
8	
9	

Drivers

Arduino

• Adafruit MCP23008 driver
• Adafruit MCP23017 driver

Raspberry Pi

• Enabling The I2C Interface On The Raspberry Pi
• MCP230xx GPIO Expander on the Raspberry Pi
• Adafruit library code for Raspberry Pi

lsmod dump with DIGIO-128 card attached

pi@raspi3 ~ $ lsmod | grep i2c_
i2c_dev                 5557  0
i2c_bcm2708             3997  0
pi@raspi3 ~ $ sudo i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: 20 21 22 23 24 25 26 27 -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: 50 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

Raspberry Pi Performance with DIGIO-128 card attached

• sudo python Adafruit_MCP230xx.py
• Clock runs at 100 KHz

• Overall timing - 1 cycle

• Overall timing - 2 cycle (Read-modify-write)

ESP32 MicroPython Drivers

• MicroPython Drivers and Libraries for ODAS cards

PyBoard MicroPython Drivers

• MicroPython Drivers and Libraries for ODAS cards

Cards

Opto-Isolated Cards

Optically Isolated cards are necessary to connect together different electrical system without concerns for ground loops, voltage dropes or electrical noise. ODAS offers two optically isolated cards; one for input and one for output.

• OptoIn8-I2C - 8-Channel Optically Isolated Input Card
• OptoOut8-I2C - 8-Channel Optically Isolated Output Card

Digital I/O Cards

Card	Function	Interface type
CARRIER95TO49MM	Adapt ODAS 49mm to 95mm cards	N/A
DCE	RS-232/TTL Converter	TTL
DTE	RS-232/TTL Converter	TTL
DIGIO-128	128-bit Digital I/O Card	I2C
DIGIO32-I2C	32-bit Digital I/O Card	I2C
DigIO16-I2C	16-bit Digital I/O Card	I2C
Front Panel For 8 Bit Computers	Front Panel for 8-bit Microprocessors with I2C interfaces (SMT)	I2C
Front Panel for 8 Bit Computers V2	Front Panel for 8-bit Microprocessors with I2C interfaces (Thru-hole)	I2C
I2CIO16-DB25	16-bit I2C I/O based on the MCP23017	I2C
I2CIO-8X	8-bit I2C I/O based on the MCP23008	I2C
I2CIO-8	8-bit I2C I/O based on the MCP23008	I2C
I2C-TEMP	I2C Temperature Sensor	I2C
I2C-RPT	4-Channel I2C Multiplexer/Repeater	I2C
I2C-RPT-08	8-channel I2C Multiplexer/Repeater	I2C
ODAS-PSOC5	Programmable System On a Chip	I2C, SPI, TTL
ODAS-RELAY-16	16 Channel Relay Card	I2C
PROTO16-I2C	16-bit I/O with prototyping area	I2C
PS2X49	PS/2 keyboard/mouse interface	TTL
SWLEDX8	8 Switches and 8 LEDs	I2C
SWLEDX8-I2C	16 bit I2C connection to SWLEDX8 card	I2C
TinyPS2	PS/2 keyboard or mouse to TTL Level Serial converter	TTL
VGAX49	VGA Digital Connection (2:2:2 or 5:6:5)	TTL/Analog
SD_CARD_X49	SD Card Adapter	TTL

ODAS Processor Cards

No Data Acquistion System is complete without a Processor Card.

• BLUE-PILL-HUB - STM32 "Blue-Pill Board" based system processor
• ODAS-PSOC5 - Cypress Semiconductor Programmable System on a Chip
• NANO-BKOUT - Arduino NANO GVS Breakout card
• GVSDuino - Arduino UNO compatible GVS Processor card
• UNO-DB25 - Arduino Uno with a DB-25 connector
• DAS-32U4 - Data Acquisition System Processor DAS-32U4

ODAS Card Test Station

• ODAS Test Station
• ODAS Tester - Test Software in GitHub repository
• Arduino Nano
• Cables or loopback connector
• Auto-detect card if test has been run before
• Presents card type list for un-programmed EEPROMs

Checking EEPROM for board type...Detected DIGIO-128 board
R=Read EEPROM, W=Write EEPROM, T=Test DIGIOs, L=Loop Test, B=Bounce LEDs