try query MCP3208

[Thorsten Sauter]

Hello all,

I am trying to query a MCP3208 on Raspberry Pi Zero W.

Unfortunately, I always get zero values from any of the eight channels.

I guess I need to specifiy the connection parameters at some point. But I have no idea how can do this. The spi struct does not expose any function for this.

SCLK        = 18 # Serial-Clock

MOSI        = 24 # Master-Out-Slave-In

MISO        = 23 # Master-In-Slave-Out

CS          = 25 # Chip-Select

Currently, my code looks like this:

func main() {

flag.Parse()

a := raspi.NewAdaptor()

adc := spi.NewMCP3208Driver(a)

work := func() {

gobot.Every(1*time.Second, func() {

for i := 0; i < 8; i++ {

result, err := adc.Read(i)

if err != nil {

fmt.Printf("E: A%d: %v\n", i, err)

return

}

fmt.Printf("--> A%d: %d\n", i, result)

}

})

}

robot := gobot.NewRobot("gtest",

[]gobot.Connection{a},

[]gobot.Device{adc},

work,

)

robot.Start()

}

Any ideas are welcome!

Thank you very much. 

Regards,

[Ron Evans]

Hi, there

Can you try the Python lib https://github.com/MomsFriendlyRobotCompany/mcp3208

It seems like there might be an incompatibility with the protocol used by this chip and the associated Gobot code, but I do not have one of the MCP3208 right at the moment for testing.