Digital inputs (DI):
DIs are designed for reading TRUE/FALSE logic states represented by direct voltage levels (voltage / no voltage). As such, they are suitable for collecting data from various two-state sensors such as:
Digital inputs on Unipi 1.1 / Lite feature counter functionality, ie. they include counter of both long pulses and short pulses with high frequency.
Note:
Unipi 1.1 and Unipi 1.1 Lite feature an integral 12 V⎓ power supply intended for use only with digital inputs. The supply has its output terminated on 12V connectors and serves mainly for buttons, switches, position sensors etc.
If an external power source is used for digital inputs, it is necessary to configure the Unipi board accordingly to prevent any damage and then to connect the GND terminal (eg. power supply negative pole) to the corresponding terminal.
Relay outputs (RO):
Designed primarily for switching ohmic loads, ROs are suitable for applications such as control of lightbulbs, thermoelectric valves, smaller heating elements, small pumps, door locks etc. Relay outputs on Unipi 1.1 are rated for 10 A max. current at 230 V~ or 30 V⎓ voltage. On Unipi 1.1 Lite, the ROs are rated for 10 A max. current at 230 V~ voltage, or 5 A current at 30 V⎓ voltage.
Analog inputs (AI):
Only on Unipi 1.1. AIs are applicable for measuring 0-10 V⎓ direct voltage. After a corresponding adjustment, this input can be also used to measure resistance, eg. from Pt1000 sensors.
Analog output (AO):
Only on Unipi 1.1. The AO generate 0-10 V⎓ direct voltage and is designed to control devices featuring analog inputs such as three-way valves, lighting dimmers etc. The output is galvanically isolated and requires an external power source (up to 35 V⎓). Alternatively, you can use the internal 12 V⎓ power source on the board - this connection is however not suited for long-term applications and should be used only for testing purposes.
Detailed info and technical parameters of inputs and outputs are available in the following subcategories:
