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UniPi-entrée-analogique (voir la source)
Version du 23 juillet 2017 à 08:48
, 23 juillet 2017 à 08:48aucun résumé de modification
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== Introduction ==
UniPi features two analog 0-10V input channels (via the MCP3422, address 0x68) marked as AI1 and AI2. Each channel has its own + and
– (e.g. AI1+ and AI1-). The + connector expects positive voltage from the connected device and – expects the negative pole (the GND).
The guaranteed accuracy is 5% however 1% is commonly reachable.
To correctly calculate the input voltage, a coefficient of the resistor divider has to be taken into account. The coefficient of each channel is saved in EEPROM as single precision binary floating point format binary32 (IEEE 754).
Before version 1.1 the coefficient is not saved in the EEPROM and thus must be calculated during conversion in software (Typically the value is around 5.56).
== x ==
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