ADC Problem

[ets]

Hi !

I just bougth the RB-110 and I have a hard time using the ADC. I tried to use the code that was given with the library and also the code I found in that thread : http://robosavvy.co.uk/forum/viewtopic.php?p=27654

The problem is that no matter what is connected (or not connected) to the pins of the adc, the output is 1023 (when unsigned) and -1 (when signed) (and it is 32767 for the second code). Sometimes, the port #7 output something different like -1.

Does anyone know what could be wrong (bios settings, spi settings, etc) ? I read that it could be burned. If so, does anyone has a rapid alternative solution (a chip I could buy and plug and not that hard to use) ?

Thanks !

Ps: Os: Ubuntu 2.6.34.1-vortex86-sg

[josh]

hi,

you find the code that is useful for RB-100.

you could add the function roboio_SetRBVer(RB_110) before the function spi_Initialize().

And try it again.

[ets]

hi,

you find the code that is useful for RB-100.

you could add the function roboio_SetRBVer(RB_110) before the function spi_Initialize().

And try it again.

Already did. My code starts with roboio_SetRBVer(RB_110)

[suv23]

this is my sensor program..this program only can read value 1023..after the value have remove from textbox and read again, the same value will appear although the range of sensor to detect was change..

Imports RoBoIO_DotNet.RoBoIO ' import the RoBoIO .Net Warper
Public Class Form1
Dim adc_data As Integer
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
TextBox1.Text = ""
End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
If (spi_Init(SPICLK_21400KHZ) = False) Then ' init SPI lib for accessing the A/D converter
End If
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
adc_data = adc_ReadChannel(ADC_USECHANNEL0, ADCMODE_RANGE_2VREF, ADCMODE_UNSIGNEDCODING)
TextBox1.Text = adc_data
End Sub
End Class

[roboard]

this is my sensor program..this program only can read value 1023..after the value have remove from textbox and read again, the same value will appear although the range of sensor to detect was change..

...

Hi,

please change

adc_data = adc_ReadChannel(ADC_USECHANNEL0, ADCMODE_RANGE_2VREF, ADCMODE_UNSIGNEDCODING)

to

adc_data = adc_ReadChannel(0, ADCMODE_RANGE_2VREF, ADCMODE_UNSIGNEDCODING)