Eight 24-Bit Analog Inputs DAQ 8-Layer Stackable HAT for Raspberry Pi
Eight Differential or Common Ground 24 bit inputs software selectable to ±0.75V, ±1.5V, ±3V, ±6V, ±12V, ±24V with status LEDs; RS485, Watchdog.
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FEATURES
- Eight 24-Bit Analog Inputs DAQ 8-Layer Stackable HAT
- All inputs differential with or without common ground
-
Eight layer stackable to 64 differential analog inputs
- Software selectable inputs: ±0.18V, ±0.37V, ±0.75V, ±1.5V, ±3V, ±6V, ±12V, ±24V
- Wide range power supply: 5V or 12V-24V
- Provides 4A continuous, 5A peak power to Raspberry Pi
-
RS485/MODBUS port
-
Uses two ADS131 24-bit Delta-Sigma ADCs from Texas Instruments
- Input impedance 300KΩ to 1MΩ
- Data rates up to 64 kSPS
- Internal or external, software selectable clock and trigger
- Hardware watchdog can power cycle the Raspberry Pi
- Real Time Clock with battery backup
- Uses only I2C port, all GPIO pins available
- Eight LEDs with programmable threshold for input status
- Pluggable Connectors 26-16 AWG wires
- General purpose push-button
- Works with any Raspberry Pi from ZERO to 5
- ECCN Code EAR99
- Command Line Driver
- Python Library
- Node-Red nodes
- OpenPLC module
- CODESYS Library
- MODBUS Interface
DESCRIPTION
Raspberry Pi has no analog signal processing capability. This HAT can read eight differential or common ground analog signals with 24 bit precision and up to 64kBPS data rate. Up to eight cards can be stacked on top of one Raspberry Pi. When multiple cards are stacked, the master card can send the clock and sync signal to all slave cards, allowing synchronized data acquisition over all the channels. It has also an RS-485 port, a power LED and a push button that can be used to shut down the Raspberry Pi. Pluggable connectors make the card easy to use when multiple cards are stacked up.
Stackable to 8 levels, the card works with all Raspberry Pi versions, from Zero to 5.
Two of the Raspberry Pi’s GPIO pins are used for I2C communication. Another pin is allocated for the interrupt handler, leaving 23 GPIO pins available for the user.
The RS485/MODBUS port permits almost unlimited expandability. On board Real Time Clock with battery backup keeps the time almost indefinitely in case of power failure. And last but not least, a hardware watchdog can power cycle the Raspberry Pi in case of software lockup.
TVS diodes on all inputs protect the card for external ESD. On-board resettable fuse protects it from accidental shorts. The card can be powered from a 5V/5A or from 12V-24VDC power supply. In both cases it provides up to 4A continuous and 5A peak to Raspberry Pi.
DIP SWITCH CONFIGURATION
STACKING MULTIPLE CARDS
Up to eight cards can be stacked on your Raspberry Pi. Three positions of the configuration DIP Switch labeled ID0, ID1, ID2 are used to select the stack level. Cards can be stacked in any order.
- Power Supply: 5V/8A pluggable connector
- On board resettable fuse: 4A
- Maximum input signal: 3.3V
- Programmable gain: 1 to 128
- Minimum input signal: 25mV full scale
- Maximum data rate: 64.4 kSPS at 80 dB dynamic range
- Minimum input impedance 1MΩ for gain > 8
- Power consumption max. 50mA
DOWNLOADS
SOFTWARE
YOUR KIT
- Four M2.5x18mm male-female brass standoffs
- Four M2.5x5mm brass screws
- Four M2.5 brass nuts
4. Mating connector plugs
QUICK START
- Plug your Eight 24-Bit Analog Inputs card on top of your Raspberry Pi and power up the system.
- Enable I2C communication on Raspberry Pi using raspi-config.
- Install the card software from github.com:
- ~$ git clone https://github.com/SequentMicrosystems/24b8vin-rpi.git
- ~$ cd /home/pi/24b8vin-rpi
- ~/14b8vin-rpi$ sudo make install
-
~/24b8vin-rpi$ 24b8vin -h
The program will respond with a list of available commands.