Phidgets Forums

Posted: **Wed Jul 03, 2019 10:02 am**

I've modified the VoltageRatioInput python example to set the Bridge Gain, but it doesn't seem to be actually setting. Here is the code and logs:

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# inside the onAttachHandler
print('bridge gain before', ph.getBridgeGain())
ph.setBridgeGain(BridgeGain.BRIDGE_GAIN_128)
print('bridge gain after', ph.getBridgeGain())

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# log:
bridge gain before 8
bridge gain after 8

After this, the code goes on to log some voltage ratios, so I know it is communicating with the hub ok.

Posted: **Wed Jul 03, 2019 10:16 am**

Ok, so I figured out the problem. When the Phidgets documentation lists BridgeGain as an Enumeration, I had assumed it was a python Enum. In fact, they are just constants. The problem is that printing out the "enumeration" BridgeGain.BRIDGE_GAIN_128 displays the value 8. It would be nice if the enumeration could be more pythonic. For example from the python3 enum documentation:

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>>> from enum import Enum
>>> class Color(Enum):
...     RED = 1
...     GREEN = 2
...     BLUE = 3
>>> print(Color.RED)
Color.RED
>>> member = Color.RED
>>> member.name
'RED'
>>> member.value
1

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BridgeGain not getting set

BridgeGain not getting set

Re: BridgeGain not getting set