Analog inputs (ADC)
Definitions
Analog to digital converters (ADC) — devices designed to convert input analog signals into digital code.
Analog inputs — ADC inputs used to measure the voltage applied to them. Analog inputs in automation devices are designed to connect sensors with an analog output signal.
Analog inputs in the Wiren Board controller
Wiren Board 6
In the Wiren Board 6 ADC processor chanels are connected to terminals A1-A4. Also, the ADC has an input voltage (after the input diodes) and a voltage at the 5Vout terminal.
Wiren Board 7
In the Wiren Board 7 processor chanels are connected to terminals A1-A3. Voltages at the D1 terminal and at the 5Vout terminal are not measured.
- Universal inputs/outputs
Wiren Board 6
Wiren Board 7
Schematic diagram of the input Ax
Schematic diagram of the input D1 in Wiren Board 7
Voltage measurement
Connection and setup
- The voltage must be within the acceptable range.
- The Ax terminal blocks perform two functions: ADC and low voltage load control. Before measuring voltage, set the corresponding low voltage load control output to the off position. For example, if you are connecting to terminal A1, turn off A1_OUT in web interface (section Relays & FETs).
- Connect your source to the Ax terminal. The voltage value will immediately appear in the web interface on the ADCs. The value is also transmitted to the message system MQTT.
Measured voltage display
The wb-homa-adc daemon transmits a value to MQTT message queuing to the /devices/wb-adc/controls/Vin topic. So the value is displayed in the web interface as the Vin channel of the ADC device.
Смотрите также: