Custard pi 7 advanced info

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The hardware hackers interface for the Raspberry Pi

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Custard pi 7 advanced info

  1. 1. CUSTARD PI 7 ADVANCED INFORMATION The Hardware Hackers Interface for the Raspberry Pi 19th Nov 2013 SF Innovations
  2. 2. OVERVIEW OF FEATURES www.sf-innovations.co.uk 2 Relay outputs 4 Open Collector outputs 2 Built in Switches 8 General Purpose Digital I/O 4 Analogue inputs 1 Analogue output 16 pin LCD Interface LED indication on most ports Screw terminal connection on most ports Flexible Power Supply Board can be powered from Raspberry Pi Board and Rpi can be powered from 5V supply Board and Rpi can be powered by 2 separate 5V supplies LED indication of 5VPi, 5V and 3V3 supplies Fused 5V and 3V3 available on screw terminals Prototyping area with pads for 14-pin SMT IC Ribbon Connector (26 way) to the Raspberry Pi GPIO Second Connector (26 way) to daisy chain a second Custard Pi -7
  3. 3. LAYOUT OF COMPONENTS www.sf-innovations.co.uk This PCB board size 15cm x 11 cm
  4. 4. PROTOTYPING AREA www.sf-innovations.co.uk
  5. 5. RELAY AND OPEN COLLECTOR OUTPUTS This is provided using the MCP23008 8-port I/O expander which works on the I2C bus. The 2 spare pins of the MCP23008 are used for the 2 key inputs from the on board switches. www.sf-innovations.co.uk This is followed by the Darlington Driver, the ULN2801 which drives the relays and provides the 4 Open Collector Outputs. There are 6 LEDs which indicate the status of these outputs.
  6. 6. LCD INTERFACE This is provided using the MCP23008 8-port I/O expander which works on the I2C bus. The functions to drive the display will be provided on the www.sfinnovations.co.uk website. www.sf-innovations.co.uk A 2 x 16 character display has a 16pin connector on a 0.1 inch pitch and can easily be connected to the Custard Pi 7 with a ribbon connector.
  7. 7. 8 GENERAL PURPOSE DIGITAL I/O This is provided using the MCP23008 8-port I/O expander which works on the I2C bus. The functions to control these I/O will be provided on the www.sfinnovations.co.uk website. www.sf-innovations.co.uk
  8. 8. 4 ANALOGUE INPUTS AND ANALOGUE OUTPUT This is provided using the PCF8591 8-bit AtoD DtoA convertor which works on the I2C bus. The functions to control these I/O will be provided on the www.sfinnovations.co.uk website. www.sf-innovations.co.uk
  9. 9. POWER MANAGEMENT There are 3 powering options. #2 Both can be powered from the board 5V. Same as above but make sure that only the board 5V is plugged in. #3 Both are independently powered. In this case make sure that jumper on J14 is on right hand side. www.sf-innovations.co.uk #1 The Rpi and the Custard Pi 7 can both be powered from the Rpi 5V supply. In this case jumper J14 is on the left hand side and the board 5V and the Rpi 5VPI are both connected together. Make sure that only the Rpi 5V supply is connected.
  10. 10. POWER CONNECTORS There is a 3-way ground connector provided. The 3V3 and 5V supply outputs on the screw terminal are fused at 100mA to prevent users from taking too much power from these rails. www.sf-innovations.co.uk
  11. 11. The Custard Pi 7 provides Raspberry Pi hardware hackers with a handy board that is packed with features. Blog dedicated to electronics & Raspberry Pi www.sf-innovations.co.uk Further information

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