|By Peter Giling|
| A nice and easy to assemble board is available now.|
No Surface Mount Devices (SMD) are used.
|The Pi01 mounted on the Raspberry Pi B||The Pi01 mounted on the Raspberry Pi B+|
All GCA interface modules like GCA76, GCA77, GCA93, GCA136 and many others are also adaptable to Raspberry PI.
For that purpose the I2C connection of Raspberry Pi is more than sufficient to get up to 128 I-O lines.
This small board will provide a connection between Raspberry Pi and the GCA-PI02 boards.
Connection between these boards are either RJ12 cable or RJ45 Ethernet, just by selection of the right connector.
All other connectors on Raspberry Pi remain accessible.
Addional, there is a 4 pin connector on board, for future expansion with serial connections.
I2C is basicly made for communication between chips, together on one board.
Therefore, according to specifications , the total length of all SDA and SCL wires together should not exceed 1 meter (3' 4'').
This system will be made with addional line drivers, making a total length of 10 meters accessable.
Each board is provided with an extra line driver P82B715 and a low drop voltage regulator to have 3.3 V available.
The regulator skips the need of transporting 3.3 V from the Raspi, which could give more problems than profit.
For more information please see http://www.nxp.com/documents/application_note/AN10658.pdf
|The pc-board and parts positions|
|N.B. Only complete ordered kits will be supported!|
|Led1 (green led)|
|OFF|| Program in Raspi not running
or no power to PI01
|slow flash||Normal function|
|Fast flash|| Button is pushed longer that 5 seconds,
Raspi will will abort program
|Led2 (red led)|
|will flash when show button is pressed in Rocnet screen|
Holding down PB1 for longer than 5 seconds will abort the RocNet program in the Raspberry Pi.
This button must be activated first on the Options Tab.
Only place jumper 1, J1, in case the 5V power supply for the Raspberry Pi comes over the RJ12 connector. (Pi06)
Make sure there is no external power supply connected to the Raspberry Pi.
By using the Rocnetnode installer the /dev/ttyAMA0 device, connector S1 will be automatically freed from use as terminal.
|S1 Pin Layout|
To enable the /dev/ttyAM0 device for serial communication the following steps are needed:
Standard the /dev/ttyAM0 is used for TTY communication; Terminal connection:
crw--w---- 1 root tty 204, 64 Feb 9 08:18 /dev/ttyAMA0
But this mode is not usable for normal serial communication, and it should be like this:
crw-rw---- 1 root dialout 204, 64 Feb 10 10:47 /dev/ttyAMA0
enable_uart=1 dtoverlay=pi3-disable-bt dtoverlay=pi3-miniuart-bt
In case the /boot/cmdline.txt contains console=serial0,115200 this text should be removed from this file.
dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
Both files can only be edited by the super user: sudo vi /boot/config.txt
An RFID reader can be connected to the serial port with the following hardware:
The GCA-Pi01 must be connected to pin 1-26.
|If the GCA-Pi01 is misplaced it could damage the Raspberry Pi. (Both models.)|
|Model B||Model B+|