The DAQ system is an open-source/open hardware (Creative Commons 4.0) embedded microcontroller system that provides data acquisition and control. The DAQ system provides digital I/O (up to 576 I/O pins), digital relay outputs (solid-state relays or mechanical relays, up to 160 relay outputs), 16-bit analog input (up to 128 single-ended channels or 64 double-ended channels), and 12-bit analog output (up to 32 channels).
The DAQ system can be controlled via Ethernet, USB, or RS-232 serial connections. It supports the use of a Netburner MOD54415 module, a Raspberry Pi (w/40-pin connector) board, or a Teensy 3.2 (Arduino software compatible) board.
When paired with a Netburner MOD54415 evaluation board, the DAQ system provides a full Ethernet-based command structure that can be controlled from a host PC (Windows, MacOS, Linux, or any other system supporting TCP/IP and socket communication).
The DAQ system was designed for use in safety critical systems (nuclear research reactors) and is well documented and tested.
The DAQ system consists of several separate circuit boards:
- DAQ_IF host computer interface module (provides connectivity and control)
- PPDIO96: digital data I/O. Up to 96 I/O lines per PPDIO96 and up to six PPDIO96 boards may be attached to a single DAQ_IF board (total of 576 digital I/O lines).
- PPOPTO-12: 12-channel opto-isolation board. Up to eight of these may be connected to a single PPDIO96 board providing optical isolation for external signals connecting to the DAQ system.
- PPRelay-12: 12-channel mechanical relay digital output board. Each relay supports NC/COM/NO (normally closed / common / normally open) contacts and can handle 2A@30VDC. Each PPRelay-12 board also provides four digital output lines capable of sinking up to 150mA each.
- PPSSR-16: 16-channel solid-state relay digital output board. Each relay can handle 1A@30VDC.
- PPAIO-16/4: 16-channel analog input, 4-channel analog output board. Each board supports 16 single-ended 15-bit analog inputs or 8 double-ended 16-bit analog inputs. Each board also provides four 12-bit digital-to-analog circuits and appropriate amplifier circuitry to produce ±5V or ±10V outputs from the DACs. Up to eight PPAIO-16/4 boards may be connected to a single DAQ_IF board (total of 128 single-ended analog inputs/64 double-ended inputs and 32 analog outputs per DAQ_IF).
- PPAC4: 4-channel analog conditioning that converts ±10V inputs to double-ended signals suitable for input to the PPAIO-16/4. Two PPAC4 boards can connect to a single PPAIO-16/4 board.
- PPAC420: Eight-channel 4-20mA conversion board. Each channel converts a 0-20mA input to a -1.25V to +5V signal (4 mA is 0V) that can be fed to an input channel on a PPAC4 board. Note that one PPAC420 board will drive two PPAC4 boards that will connect to a single PPAIO-16/4 board.
- PPBreakout: A 12-channel breakout board that brings out 12 digital I/O lines on the PPDIO96 to a set of screw terminals.