Raspberry Pi DAQ HAT Can Stack Eight High

By Eric Brown

In August, Measurement Computing Corp. (MCC) launched its MCC 118 voltage measurement DAQ HAT for the Raspberry Pi with eight ±10 V inputs and sample rates up to 100 kS/s. It has now released a promised MCC 152 voltage output and digital I/O HAT that can be stacked along with the MCC 118 and future MCC HATs in configurations of up to eight boards.

 
MCC 152 with Raspberry Pi (left) and stacked with other MCC 152 boards
(click images to enlarge)
The $99 MCC 152 is equipped with two 12-bit, 0-5 V analog outputs with update rates up to 5 kS/s. There are also 8x bidirectional digital I/O lines with 3.3 V and 5 V support that can be “configured as input or output on a bit by bit basis,” says MCC. Each output bit can source 10 mA and sink 25 mA, and can be individually disabled.

Screw terminal connections are available for all I/O, and power is provided via the Raspberry Pi’s 40-pin GPIO connector. The 65 mm × 56.5 mm × 12mm HAT supports 0 to 55°C temperatures.

HAT configuration parameters are stored in an on-board EEPROM so you can set up the GPIO pins via the Pi when the HAT is connected. When stacking boards, onboard jumpers identify each board in the stack.



MCC 152 block diagram
(click image to enlarge)
MCC provides an open-source MCC DAQ HAT Library in C/C++ and Python hosted on GitHub. The library includes console-based example programs with descriptions and lists of demonstrated functions. A MCC DAQ HAT Manager utility program offers an MCC 152 App to verify functionality. The utility requires the Raspbian desktop interface. API and hardware documentation are also provided.

Further information

The MCC 152 HAT is available for $99. More information may be found at the MCC 152 announcement and product page.

This article originally appeared on LinuxGizmos.com on January 10.

Measurement Computing | www.mccdaq.com

High-Current PC/104 Board Delivers 48 Channels of I/O

Apex Embedded Systems offers the TRACER-DIO-5VIO, a high current PC/104 digital I/O and counter/timer module. The module provides 48-lines of 8255 compatible general purpose I/O and three 16-bit 8254 compatible counter/timers. The board is a COTS module used in military, aerospace and industrial applications.
This product is an update from the company’s classic Tracer-E. The digital I/O module provides true 5 V output swings and accepts full 5 V inputs. It has 48-lines of 8255 compatible general purpose I/O and three 16-bit 8254 compatible counter/timers. Optional 2 mm connectors and cables, terminal board and cable accessories are available. A tin mitigation option available via special order. Firmware modifications are available on request.

Features:

  • High-Current Outputs can sink 32 milliamps, and source 32 milliamps per channel. This is true even while operating at high temperatures.
  • Direct Interfacing to OPTO-22’s isolated I/O racks. Digital I/O connector is organized to allow direct connection to OPTO-22’s isolated I/O racks that use the G4 serial of I/O modules, the PB16-H, PB16-J, PB16-K, PB16-L, PB8H and the PB24HQ.
  • Environmental: Wide operating temperature range of -40  to +85 degrees C
  • Polarized connectors prevent incorrect cable installations
  • LED status: an LED displays valid card read/write transactions useful for both product development and field status.
  • Single +5V operation: approximately 500 milliwatts (inputs/outputs unloaded)
  • Out-gassing and fire avoidance: They do not use any tantalum or electrolytic capacitors in any products.
  • Reliability: MTBF of 724,559 hours per MIL-HDBK-217F ground benign at 25o= degrees C.
  • Production: Designed and Assembled in Wisconsin, USA, utilizing an ISO 9001 manufacturing facility.

Apex Embedded Systems | www.apexembeddedsystems.com

 

FMC Board Serves up Rich, Flexible I/O Set

Vadatech has announced the FMC155. The FMC155 is an FPGA Mezzanine Card (FMC) per VITA 57.1 standard, offering a small footprint and allowing for general-purpose I/O expansion.

The FMC155 provides sixteen LVDS input/outputs, eight RS-485/422 RX plus eight RS-485/422 TX, and sixteen single-ended +3.3 V input/outputs. LVDS signals go through a Cross Bar Switch (CBS), which allows input/output routing within each group of eight LVDS signals. Each FMC155 CBS port can be individually software-configured for routing, termination, and direction. RS-485/422 can be full duplex or half-duplex depending on ordering option selected.

System integrators will value having a single off the shelf module to provide multiple I/O with standard high density connector for ease of cabling and differential signaling between the transceivers on the FMC and the FPGA on the carrier for optimal signal integrity across the FMC connector. The flexibility provided by the cross bar switch eases integration with programmable LVDS termination and routing.

Vadatech | www.vadatech.com

COM-Based SBCs Offer High I/O Density

Diamond Systems has released its ultra-small COM-based ZETA single board computer family. Highlights include interchangeable COM Express COMs for scalability and long product life, ultra- compact size and an rich amount of I/O, including a complete high-quality analog and digital data acquisition subsystem.

Designed in the COM Express Mini Type 10 form factor (84 mm x 55 mm / 3.3 in. x 2.2in.), the Zeta family offers performance scalability due to its use of COM Express CPU modules. Three processor options are currently available: Intel “Bay Trail” E3825 dual-core 1.33 GHz CPU with soldered 2 GB RAM; Intel “Apollo Lake” E3940 quad core 1.60 GHz CPU with soldered 4 GB RAM; and Intel “Apollo Lake” N4200 quad core 1.1 GHz (burstable to 2.5 GHz) CPU with soldered 8 GB RAM.

zeta-enlargedThe use of interchangeable CPU modules in the increasingly popular COM Express Mini Type 10 format enables Zeta to serve applications across a wide spectrum of price and performance needs. It also offers customers the longest possible product lifetime by vastly simplifying migration to a new CPU when the current one reaches its end of life. Zeta is an excellent choice for applications with expected lifetimes of 10 or more years, including military, medical, and transportation.

Zeta’s two-board COM + baseboard construction yields the highest feature density possible in a given footprint. The COM provides the core CPU functions, while the baseboard provides the “final inch” for all the system I/O plus the data acquisition subsystem, power supplies, and expansion sockets. Zeta provides as much as a 60% reduction in size compared to boards in larger form factors offering the same level of I/O.

Zeta’s impressive I/O list includes the following:

  • VGA display and Single-Channel LVDS port
  • Dual Gigabit Ethernet
  • 4 USB 2.0 Ports + 1 USB 3.0 port
  • 4 RS-232/422/485 ports with software-programmable protocol and termination
  • 16 digital IlO lines
  • Optional complete analog and digital data acquisition system
  • Integrated wide-range 6 V to 36 V power input circuit

Zeta is available in two I/O configurations, digital I/O only or digital + analog I/O. The DIO only circuit offers 16 DIO lines with selectable 3.3V/5V logic levels. The full circuit includes 16 channels of 16-bit A/D, 4 channels of 16-bit D/A, 27 digital I/O lines with selectable 3.3V/5V logic levels, and 8 32-bit counter/timers, all supported by Diamond’s free, industry-leading Universal Driver data acquisition programming library. An interactive graphical control panel for Windows and Linux is also provided to control all data acquisition features.

Zeta offers multiple options for system expansion and mass storage. It includes a PCIe Minicard / mSATA socket and a micro-SD socket. A unique expansion connector enables the installation of a daughterboard that contains an M.2 SATA SSD socket, a second PCIe Minicard socket, HD audio and 16 additional GPIO lines.

A built-in heat spreader efficiently removes heat from the SBC to keep the processor and all internal electronics cooler for improved reliability. The bottom-side mounting configuration of the heat spreader provides a secure and convenient mounting system for the board. It also simplifies the installation of I/O expansion modules by eliminating interference or airflow problems that can occur with traditional heat sinks. All three models of Zeta are tested for operation over the full industrial temperature range of -40°C to +85°C, making Zeta well suited for vehicle applications.

Diamond Systems | www.diamondsystems.com