Multi-IO HAT 8-Layer Stackable for Raspberry Pi
24V POWER SUPPLY: The card uses a standard industrial 24V power supply to power the board, or any DC power supply from 10V to 30V. Power requirement is 1A at 24V (24W). It provides 5V and up to 3A to Raspberry Pi and any other HATs you might install on the same stack.
DIGITAL INPUTS: Opto-isolated digital inputs can be jumper-selected in two configurations: four with common ground or two fully isolated inputs.
RTD INPUTS: RTDs (Resistance Temperature Detectors) are resistive elements that change resistance over temperature. They can make measurements with accuracies of well under 0.1°C. Three wires compensate for the voltage drop across the wires. The card has two 3-wire RTD inputs, which can read temperatures using PT100 sensors.
0-10V and 4-20mA ANALOG INPUTS: Two analog inputs can read 0-10V, and two more can read 4-20mA signals. The inputs are processed using 12-bit A/D converters. Factory precision is approximately 1%. Precision up to 0.1% can be obtained through field calibration using command-line functions.
0-10V and 4- 20mA ANALOG OUTPUTS: Two analog outputs can drive 0-10V signals for light dimmers or industrial actuators, and two more can drive 4-20mA current loops. The outputs are generated using 16-bit PWM timers. Discrete components limit the factory to 1% accuracy, but precision up to 0.1% can be obtained through calibration. Command-line functions are provided for analog field calibration.
RELAYS: The Raspberry Pi IO Multi-IO HAT contains two relays that can drive AC or DC loads up to 5A and 24V. The board geometry imposes current and voltage limitations. If a conformal coating is applied to the board, loads up to 240V can be driven. The relays are SPDT, but only the normally open contacts are brought to the connectors due to space limitations.
RS485 COM PORT: The RS485 port can be accessed from the local processor or the Raspberry Pi. If the local processor controls the port, the lines to the Raspberry Pi are disconnected with jumpers, releasing the pins for other functions. The RS485 uses pins 8 and 10 of the GPIO connector.
RS232 COM PORT: The RS232 can be accessed only from the Raspberry Pi. It uses pins 32 and 33 of the GPIO connector. If the port is not in use, pin 33 (Rx) can be disconnected with a jumper and used for other functions.
STAND-ALONE OPERATION: If the RS485 is used with the local processor, the card can be stand-alone (no Raspberry Pi is needed), and all I/Os can be accessed using standard MODBUS commands.
STATUS LEDs: A power LED flashes, indicating the local processor is active. Eight more LEDs can be configured in software to show the status of any input, output, or relay. If assigned to digital I/Os, the LEDs show when the signal is high or low. If assigned to analog I/Os, the LEDs can be triggered on predefined signal levels.
REAL-TIME CLOCK: Install a CR2032 battery in the socket to use the real-time clock. The battery can power the clock for many months. A software command can periodically read the battery voltage to decide when the battery needs to be replaced.
HARDWARE WATCHDOG: If the hardware watchdog is activated, the Raspberry Pi has to access the processor at a preset interval to ensure it is still operational. If the Pi fails due to software lockup, the local processor performs a hardware reset by cycling the power.
MICRO-MOTOR DRIVER: A micro-motor can be proportionally driven using a 5VDC/100mA motor driver and two PWM outputs from the processor.
SERVO MOTORS: Servo motors have power, ground, and signal wires. Two servo ports are available, driven by PWM pins from the local processor.
STACKING MULTIPLE CARDS: Your Raspberry Pi can hold up to eight cards. The three positions of the configuration DIP Switch, labeled ID0, ID1, and ID2, select the stack level. Cards can be stacked in any order.
PUSH BUTTON: The push button can add manual input to any system. It can also be used arbitrarily by Node-RED or other Raspberry Pi programming.
PLUGGABLE CONNECTORS: Pluggable connectors make connecting the card to external devices easy. All the connector plugs are included with the card. To maximize the perimeter space, two-level connectors are used for the RTD and serial communication ports.
EXPANDABILITY: The card can be used with any Raspberry Pi or stand-alone mode and connected to any standard PLC through MODBUS. Up to eight cards can be plugged into each Raspberry Pi.
RASPBERRY PI GPIO CONNECTOR: The Multi-IO HAT communicates with the Raspberry Pi using only the I2C ports, leaving all the other GPIO pins available for the user.
Card Layout
Mechanical Specifications
Features
- Uses only the I2C port, works with all Raspberry Pi versions from Zero to 5
- Wide range 10-30V power supply provides also 5V/3A to Raspberry Pi
- Four common ground digital inputs
- Event counters up to 32KHz
- Two 3-wire RTD ports with 24-bit delta-sigma A/D converters
- Two 0-10V analog inputs, 200 sps
- Two 4-20mA analog inputs, 200 sps
- Two 0-10V analog outputs
- Two 4-20mA analog outputs
- Two 5A/24V relays with normal-open contacts and status LEDs
- Two communication ports: RS485/Modbus and RS232
- H-Bridge PWM Motor Driver
- Two servo control ports
- Nine Status LEDs (six general purpose)
- On-board push-button
- Hardware watchdog
- Real Time Clock with battery backup
- Pluggable Connectors
- Stand-alone operation (No Raspberry Pi) using RS485/MODBUS
- On-board 5V/2.5A step-down power supply for Raspberry Pi
- Eight eight-layer stackable for IO expansion
- Uses only the I2C port, all GPIO pins available
- Works with any Raspberry Pi from ZERO to 5
- ECCN Code EAR99
- Command Line Driver
- Python Library
- Node-Red nodes
- CODESYS Driver
- Home Assistant Integration
- RoHS and REACH Compliance
MULTI-IO Downloads
VERSIONÂ 1.3 DOWNLOADS
- User’s Guide V1.3
- Hardware Schematic V1.3
- Hardware Schematic V2.0
- 3D Printing Enclosure
- 3D STEP Model
- Command Line
- Python Libraries
- Node-RED nodes
- RoHS and REACH Compliance Declaration
Software
SOFTWARE INTERFACES
You can write your application using the Command Line or the Python Library provided. No programming is required if you use the Node-Red nodes we supply. You can design your application by dragging and dropping the functional blocks.
Node-RED PROGRAMMING
Node-RED is a programming tool for wiring hardware devices, APIs, and online services in new and interesting ways. It provides a browser-based editor that makes it easy to design flows using nodes from an extensive library covering a wide range of automation tasks. Native Node-RED nodes are provided to access all the Multi-IO HAT functions.
What’s Included:Â When you purchase the I/O Learning Kit, you will receive the following items:
Multi-IO Card
Mounting hardware
- Four M2.5x18mm male-female brass standoffs
- Four M2.5x5mm brass screws
- Four M2.5 brass nuts
Mating connector plugs
Quick Start
- Plug the Multi-IO HAT card into your Raspberry Pi and power up the system.
- Enable I2C communication on Raspberry Pi using raspi-config.
- Install the card software from github.com:
- ~$git clone https://github.com/SequentMicrosystems/multiio-rpi.git
- ~$ cd /home/pi/multiio-rpi
- ~/multiio-rpi$ sudo make install
- ~/multiio-rpi$ multiio -h
- The program will respond with a list of available commands.
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