ExtRaPi: Raspberry Pi HAT with Power Supply, RS485, RS232 and 1-Wire Bus – ExtRaPi
You can take your Raspberry Pi to perfection with ExtRaPi! The popular Raspberry Pi will receive an industrial extension: a high-quality power supply with an input range of up to 30 V, an RS485 bus with galvanic isolation, an RS232 serial port with TTL levels, a touch screen interface, real-time clock (RTC) with backup battery, a 1-wire bus for thermometer or iButton reader, SPI, I2C and even a supervisor (watchdog).
ExtRaPi: Raspberry Pi HAT with Power Supply, RS485, RS232 and 1-Wire Bus – ExtRaPi
You can take your Raspberry Pi to perfection with ExtRaPi! The popular Raspberry Pi will receive an industrial extension: a high-quality power supply with an input range of up to 30 V, an RS485 bus with galvanic isolation, an RS232 serial port with TTL levels, a touch screen interface, real-time clock (RTC) with backup battery, a 1-wire bus for thermometer or iButton reader, SPI, I2C and even a supervisor (watchdog).
- 1-Wire
- RS232
- RS485
- Papouch Converters
You can take your Raspberry Pi to perfection with ExtRaPi! The popular Raspberry Pi will receive an industrial extension: a high-quality power supply with an input range of up to 30 V, an RS485 bus with galvanic isolation, an RS232 serial port with TTL levels, a touch screen interface, real-time clock (RTC) with backup battery, a 1-wire bus for thermometer or iButton reader, SPI, I2C and even a “watchdog.”
Features of the Expansion Board for Raspberry Pi
- Electronics designed for reliable industrial use in automation.
- Quality power supply with a range of 9 to 30 V DC and an output of up to 5 A for the Raspberry Pi. (The need to power the Raspberry via the USB connector is eliminated).
- Power connection with high-quality industrial push-in terminal.
- RS232 serial port (RxD, TxD, GND).
- RS232 serial port with TTL levels.
- Galvanically isolated RS485 industrial bus with push-in terminal.
- Real-time clock with backup battery (DS1307).
- DSI interface and I2C connector for standard 7″ Raspberry Pi Touch Screen. ExtRaPi has enough power to power the screen.
- Smart WatchDog for automatic Raspberry Pi restart in case of problems.
- 1-Wire for connecting a Dallas iButton thermometer or chip reader.
- SPI and I2C connected to connectors for easy connection of other peripherals.
- Compatible with Raspberry Pi 2B, 3B, 3B+ and 3A+ and 4B.
- Tip: With ExtRaPi, you can easily run the Node-RED automation system on your Raspberry Pi and measure the temperature, for example with our TQS4
Interface
Interfaces
Peripherals
Raspberry Pi industrial extension peripherals
Power Supply for Raspberry Pi
- Finally, a quality power supply with enough power for the entire Raspberry and a 7″ screen!
- Input range: 9 to 30 V DC
- Output load: 5 A (available for Raspberry Pi and USB peripherals)
- Reverse polarity protection: yes
- Cable connection: spring terminal for stranded and solid wires from 0.2 to 1.5 mm²
RS485 Industrial Bus for Raspberry Pi
- Universal bus for connecting up to 32 other devices. For example, our TQS4 thermometers, THCO2 (CO2, temperature, humidity), THT2 sensors (temperature, humidity), Quido I/O modules, etc.
- Galvanic isolation: yes, inductive.
- Cable connection: spring terminal for stranded and solid wires from 0.2 to 1.5 mm²
- GPIO used in RPi: 14, 15
- BIAS jumpers can be used to connect 680 Ω resistors that define the silence of the line.
- A 120 Ω resistor can be connected via the TERM jumper if the RPi is an RS485 bus terminal.
- The port is fused with RS232 TTL and RS232. Common indication by RxD and TxD indicators.
- Modbus library for Node-RED: for example node-red.
RS232 Serial Port for Raspberry Pi
- Ideal for peripherals such as “contactless” readers, industrial PLCs, etc.
- Voltage levels: V.24 (standard)
- RS232 signals: RxD, TxD, GND
- Connector type: S3B-PH-K-S
- GPIO used in RPi: 14, 15
- The port is fused with RS232 TTL and RS485. Indication by RxD and TxD indicators.
RS232 TTL Serial Port for Raspberry Pi
- Voltage levels: TTL 5V
- RS232 signals: RxD, TxD, GND
- Connector type: S3B-PH-K-S
- GPIO used in RPi: 14, 15
- The port is fused with RS232 TTL and RS485. Indication by RxD and TxD indicators.
1-Wire Bus for Raspberry Pi
- Designed to connect DS18B20 thermometers, iButton chip readers (for attendance system), etc.
- Voltage levels: 5V
- Max. current of the +5V pin: approx. 15 mA
- Connector type: JST PH
- GPIO used in RPi: 4
- With protection against damage to the port on Raspberry Pi.
- Node-RED library
Real-time Clock (RTC) with Backup for Raspberry Pi
- The circuit retains the current system time even in the event of a main power failure.
- RTC circuit used: DS1307 on the I2C bus
- Backup battery: CR2032
- GPIO used in RPi: 2, 3 (SDA, SCL)
- This library can be used for Raspbian Stretch and Buster (now Raspberry Pi OS).
Dynamic “Watchdog” for Raspberry Pi
- The “watchdog” can check if Raspberry Pi is stuck due to a program anomaly or any other reason. If the status of GPIO24 does not regularly change from 1 to 0, ExtRaPi restarts the Raspberry via the designated pins and the Raspberry Pi restarts.
- How does it work?
- Immediately after electrical connection, the timer set to 3 minutes starts running.
- If no change in GPIO24 from 1 to 0 is recorded during this time, Raspberry Pi will be restarted.
- Raspberry is kept in restart for 9 seconds.
- If a restart has occurred, the timer is doubled, i.e. to 6, 12, 24, etc. minutes. It gives RPi more time to start correctly next time.
- If GPIO24 regularly changes from 1 to 0, the timer is reset to a new 3-minute countdown.
SPI Bus
- Universal serial bus for connecting other peripherals.
- Connector type: S8B-PH-K-S
- GPIO used: 7, 8, 9, 10, 11 (CE1, CE0, MISO, MOSI, SCLK)
- 5 V (ExtRaPi source) and 3.3 V (RPi source, pin 1) are also connected to the SPI bus connector.
I2c Bus – 7″ Touch Screen for Raspberry Pi
- Universal serial bus for connecting other peripherals.
- The connector exactly matches the power and communication connector of the 7″ Raspberry Pi Touch Screen.
- GPIO used: 2, 3 (SDA, SCL)
- A 5 V power supply (ExtRaPi source) is also connected to the I2C bus connector.
- Connector type: 5 x 2.54 mm pin strip
Other Technical Parameters
- Mounting holes: 3 mm in diameter for direct mounting on Raspberry Pi.
- Package contents:
- ExtraPi
- Columns and screws for mounting on Raspberry Pi
- CR2032 battery
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