xo1 voltage block is ac coupled

[tonyforster]

xo1 os373pyg ta131 voltage looks to be ac coupled - otherwise all is ok at linux conference australia 2012 :)

[walter]

Is this problem exclusive to XO 1.0? Also, do you know what build you are using?

(Glad to hear LCA is going well)

[tonyforster]

just the 1.0
all running ta131

xo1 os373pyg ac coupled
xo1.5 os880 OK
xo1.75 os25 crashes, see next ticket

[walter]

Could you please check the Measure program to see if it has a similar problem? (Also please test Measure in regard to #3297)

[tonyforster]

xo1 os373pyg DC is ok on measure (this might be a prerelease V36, I cant remember)

[walter]

Resistance sensors are working OK? not ac coupled?

And you are using a voltage block, not a voltage2 block (which should no longer appear on XO1 as per a recent patch)

​http://git.sugarlabs.org/turtleart/mainline/commit/536e8bc53fc83fcc051ae79859bd6912e2260af0

From audio_sensors.py:
elif self.hw == XO1:

self.PARAMETERS = {

SENSOR_AC_BIAS: (False, True, 40, True),
SENSOR_DC_NO_BIAS: (True, False, 0, False),
SENSOR_DC_BIAS: (True, True, 0, False)
}

For both Resistance (DC_NO_BIAS) and Voltage (DC_BIAS) the first parameter (DC_MODE) is True, hence my first question above.

[tonyforster]

XO-1 resistance block is also AC coupled

I am using voltage, not voltage2

[walter]

XO-1 resistance block is also AC coupled

OK. That gives me a better sense of where to look for the problem. Will report back.

I am using voltage, not voltage2

Good. I have removed voltage2 from XO1, since we only have 1 channel.

​http://git.sugarlabs.org/turtleart/mainline/commit/536e8bc53fc83fcc051ae79859bd6912e2260af0