Measurement Computing Corporation (MCC) has introduced a range of DAQ HATs for Raspberry Pi™
- MCC 128 and 118 Voltage Measurement HATs
- MCC 172 IEPE Measurement HAT
- MCC 134 Thermocouple Measurement HAT
- MCC 150 Voltage Output and Digital I/O HAT
These and other MCC products are available in Africa through Osiris Technical Systems.
Professional DAQ for Raspberry Pi™
Raspberry Pi is the most popular single board computer in use today, but does not have built-in Test and Measurement capabilities such as Analog-to-Digital Converters (ADCs), Digital-to-Analog Converters (DACs), or conditioned Digital Inputs and Outputs (DIO). However, these capabilities can be added through the 40-pin GPIO header. A device that connects directly to the 40-pin header and stacks onto the Raspberry Pi is called a HAT (Hardware Attached on Top).
Over the years, individuals have published open-source designs and small companies have sold low-cost HATs for a variety of tasks, including support for analogue and digital I/O. These designs and products are adequate for the education and hobbyist/maker market but have some serious short comings for professional Test and Measurement applications. Most of these devices are provided partially assembled, without specifications or programming support, and without performance guarantees that can only be achieved with a thorough device validation process.
To bring professional-quality measurement products to the Raspberry Pi platform, Measurement Computing (MCC) has developed a series of DAQ HATs. These HATs offer similar specs and accuracy as traditional USB and Ethernet-based DAQ products from MCC with resolution up to 24-bits and sample rates up to 100 kS/s. This range is now available in Africa through Osiris Technical Systems.
MCC DAQ HAT product range
MCC offers five products designed for Test and Measurement applications that conform to the Raspberry Pi HAT standard. These devices provide data acquisition features like analogue and digital I/O in a small, stackable format. DAQ HATs can be used in basic applications with just a few voltage input channels or more sophisticated applications with up 64 channels of multiple signal types.
Voltage Measurement HATs
MCC 118 is an eight-channel voltage measurement HAT. It allows users to measure 12-bit data at an overall throughput of 100 kS/s. Eight devices can be stacked on a single Raspberry Pi to create a 64-channel device capable of reading data at a combined rate of 320 kS/s.
MCC 128 features 16-bit resolution and includes eight analogue inputs with a maximum sample rate of 100 kS/s. Multiple gains ranges are also included which provides users the ability to make precision measurements.
Voltage Output and Digital I/O HAT
MCC 152 provides two 12-bit analogue outputs along with eight 5 V or 3.3 V DIO channels enabling the creation of a full multifunction Raspberry Pi measurement and control system.
Thermocouple Measurement HAT
MCC 134 is designed for temperature measurement applications and features four thermocouple input channels. A 24-bit A/D and cold junction compensation provide professional grade accuracy. Multiple thermocouple types are selectable on a per channel basis. MCC has a long history of designing and building accurate DAQ devices for measuring thermocouples. Thermocouples provide a low-cost and flexible way to measure temperature, but measuring thermocouples accurately is difficult. Through innovative design and extensive testing, MCC overcame the challenge of measuring thermocouples accurately in the uncontrolled Raspberry Pi environment.
IEPE Measurement HAT
MCC 172 is designed for sound and vibration applications and offers two IEPE inputs channels capable of measuring IEPE sensors like accelerometers and microphones without any additional signal conditioning. Inputs can be simultaneously sampled at up to 51.2 kS/s per channel.
MCC DAQ HATs come with software libraries that support Python™ and C/C++® to facilitate quick and easy development. Comprehensive API and hardware documentation are also provided. The DAQ HAT software library was created and is supported by MCC. The development repository is located on GitHub where users can find libraries, examples, firmware updates, and more: https://github.com/mccdaq/daqhats
DAQ HAT Applications
Raspberry Pi is a good fit for many DAQ applications. MCC DAQ HATs have been used in a variety of applications and industries. These applications can be lab-based, remote and IoT solutions, and OEM/embedded systems. Some customer applications/industry examples include, biomechanics, wind energy, power monitoring, machine condition monitoring, predictive maintenance, and more.
AC Power Monitoring IoT Solution using MCC 118 with Raspberry Pi
A mobile communications company used the MCC 118 to create an IoT solution to monitor and analyse the external city power being supplied to their facilities.
Probe Permeameter Machine using MCC 118 and MCC 134 with Raspberry Pi
RO Scientific used the MCC 118 voltage measurement HAT and the MCC 134 thermocouple measurement HAT in the design of a probe permeameter machine used in testing rock samples for the oil and gas industry.
Machinery Monitoring and Predictive Maintenance using MCC 172 and MCC 134 with Raspberry Pi
The MCC 172 IEPE measurement HAT and MCC 134 thermocouple measurement HAT are used to measure vibration and temperature respectively, and collect the data needed to create accurate measurements, analysis, and strategy.
Neuromuscular Biomechanics Test System Using MCC 172 and Raspberry Pi
The Raspberry Pi and MCC 172 allowed researchers to create a lightweight and wearable DAQ solution to measure dynamic activity for testing neuromuscular biomechanics.