STEPPIII Hardware description
Version 1.0.0
6.1.2 Special pin description
6.1.2.1 Analog inputs (2, 4, 6, 8)
Analog voltages up to 32 V with 10 bit resolution can be processed and
remotely evaluated by a server application. Pull-up resistor to a constant
input voltage allows for resistive transducers to ground, e.g. fuel sensor or
thermistors.
Because the pins
2
,
4
,
6
, and
8
can operate either as digital or
analog, they have to be configured and calibrated for such purposes
before using as analog outputs.
↓
Connection example for analog input 0 (IN0):
Thus, an analog input can be connected to a temperature sensor (a NTC
resistor for instance). It is possible to set a low temperature alarm and a high
temperature alarm (upper and lower values), passed to required
temperature. Passage through these thresholds will trigger an alarm. We
recommend to use SMS or TCP as alarm type with GPIOP as attachment
protocol. The SMS can be received on a mobile phone, modem or any GSM
device. An application example is shown in figure below:
Figure 5:
Connection example for analog input (IN0)
↓
Connection example for analog input 1 (IN1):
Likewise, on another analog input you can install a tachometer generator.
The maximum output voltage of the tachometer is + 32 V
(see illustrated
example in figure below)
.
Both circuit examples (the NTC diagram above and the Tachometer) are only illustrations to
show the aim of the analog inputs.
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