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MCP3008 Setup

Connections

MCP3008 PinRasp Pi Signal
VDD+3.3V
VREF+3.3V
AGNDGND
CLKSCLK
DOUTMISO
DINMOSI
CS /SHDNCE0
DGNDGND


CH<number> pins get connected to the AnalogOUT of the analog circuits

Analog Circuits

Force-sensitive Resistor


Photocell

Potentiometer (Variable Resistor)

Running SPI Sample

First build the dio-spi.jar file:


cd samples/spi
ant


Then copy ../../build/jar/dio-spi.jar to the board.

(On the Pi)
For this example you should have SPIDevice entry in your dio.properties file like this example for the raspberry pi:


12 = deviceType: spibus.SPIDevice, name:SPI_Slave, deviceNumber:0, address:0, csActive:1, wordLength:8, clockFrequency:500000, clockMode:1, bitOrdering:1


Note that these are the current values in the repo which reflect a recent update. Older dio.peprties versions will not work.


sudo $JAVA_HOME/bin/java -Djava.library.path=. -Djava.security.policy=./java.policy -classpath .:./dio.jar:dio-samples.jar:dio-spi.jar -Djdk.dio.registry=./dio.properties -Ddeviceaccess.uart.prefix=/dev/ttyAMA dio.spi.MCP3008Sample 12 4


Note that "12" is the device manager ID number of the SPIDevice in the example property line shown above. "4" selects the channel on the MPC3008. You should use the channel number connected to the analog circuit you're trying to read.