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for Embedded Systems
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An expansion module can be plugged into the main expansion connector to implement push-buttons. If the module extends only forward of the connector, it can be installed at the same time as the display option package. By spacing it the right amount from the main board, buttons can be made to protrude through the top of an enclosure.
UART0 signals are brought to the main expansion connector together with GPIO. Plug-in expansion modules could implement the following:
UART1 signals are only available on the main board, unless they are routed over the auxiliary expansion connector. Two RS232 transmit drivers and two receive buffers are provided on the main board in a MAX232-type device. Prototyping area is sufficient for a second such device or for RS422 / RS485 drivers as required.
The twelve inputs to the analog-to-digital converter, the analog reference and all timer outputs are brought to the main expansion connector. A plug-in analog expansion board could have the following features:
Using prototyping areas on the main board, it is possible to quickly wire up simple voltage dividers between the built-in analog reference and the analog inputs. With a cadmium sulfide photocell and a thermistor, ambient light and temperature measurement can easily be achieved.
Two 8-pin DIP sockets for I2C serial memories are included on the main board. Using Microchip 24LC256 devices, up to 64 Kbytes of EEPROM can be added.
The I2C signals are present on the main expansion connector. Any I2C device can therefore be assembled onto an expansion card and plugged in.
The four SPI signals are present on the main expansion connector. Any SPI device can therefore be assembled onto an expansion card and plugged in.
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