Com Pi RS232 Serial and 1 Wire

£23.99 each

Ex VAT: £19.99

12 in stock


Product Code: ComPi


Tags

  • Hardware mounting kit and GPIO extension header included.
  • RS232 Master Port.
  • Control the Raspberry Pi over RS232 or connect to external serial accessories.
  • 1-Wire® to I2C host interface with ESD protection diode.
  • Stackable with other Raspberry Pi accessory boards.
  • Buffered 5V I2C port.
  • External 5V power input for 1-Wire® interface.

The Com Pi from AB Electronics is a communication add-on board for the Raspberry Pi supporting RS232 and 1-Wire® protocols. A 5V buffered I2C port is also provided on the board.

The RS232 port is connected to the UART port on the Raspberry Pi using a MAX3232 interface. The MAX3232 IC converts the 3.3V UART port to RS232 voltages allowing communication with RS232 compatible devices over a DB9 serial cable or with the use of a null-modem cable the board allows terminal access with linux on the Raspberry Pi using a terminal application. The RS232 port can be accessed through the DB9 port or the solder points on the PCB.

The 1-Wire® port is based around a DS2482-100 I2C to 1-Wire® bridge device. The DS2482-100 provides bi-directional protocol conversion between the I2C port on the Raspberry Pi and any attached 1-Wire® slave devices. An ESD Protection Diode is used to protect the Com Pi and Raspberry Pi from electrostatic spikes on the 1-Wire® port. Connections to the 1-Wire® port can be made through the RJ-12 socket or the solder points on the PCB.  Wiring diagrams for the RS232 and 1-Wire® ports can be found on the Com Pi datasheet.

A 5V input port is also provided allowing you to use an external power supply on the 1-Wire® interface, reducing the load on the Raspberry Pi. If you choose to use the external 5V input please remove the jumper on the board to isolate the Raspberry Pi 5V bus.

Additional Information:

Datasheets

Com Pi Datasheet

DS2482S (1-Wire Interface)

MAX3232E (RS232 Interface)

Input Ratings & Specifications

Vdd (5V input pin): 5.0V

Maximum current on 1-Wire pins: ±20 mA

I2C SDA/SCL voltage: 5.0 V

I2C port current: 100 mA

Schematic

Click to download
Click to download schematic PDF.

Sample Code

The Quick2wire lib from https://github.com/quick2wire/quick2wire-python-api allows easy access to the I2C port via Python.

Configuring the RS232 communication on the Raspberry Pi

Configuring and using the 1-Wire® port on your Raspberry Pi

Sorry there are not any current customer reviews for this item.


Write your own review

How do you rate this product?
  star rating star ratingstar rating star ratingstar ratingstar rating star ratingstar ratingstar ratingstar rating star ratingstar ratingstar ratingstar ratingstar rating
Features
Build Quality
Assembly
Ease of Use
Performance
 
   Name:
   Review Title:
   Your Review:
 
  All fields are required.

Using the Serial Port

OWFS (One Wire File System) with I2C support on Raspberry Pi

Customers who bought this item also purchased...