Numato_Meter Mini-App

This simple meter macro reads an analog input pin from a Numato USB device and displays the reading directly in volts. Hitting any key exits the macro.

As written, it supports the Numato 8, but you can easily modify it for Numato 16, 32, or 64 by changing the Posn#0="Nu08" line to use "Nu16", "Nu32", or "Nu64".

You will also need to change the K=5.0 / 1023 line by replacing the 5.0 with 3.3 since these other devices use the lower supply voltage.

That line assumes that the power supply is exactly 5.0 (or 3.3) volts, but you can calibrate the unit for greater accuracy if you can measure the supply with a separate meter that you trust; just replace the 5.0 with that reading.

;<Help=H492E

Posn#0="Nu08"               ;Scan for Numato 08
Posn#1=0                    ;First match
@_ComDev_Scan               ;Scan COM devices for match

UP="0"                      ;ADC 0
K=5.0 / 1023                ;Factor, 0-1023 count to volts

UK=0                        ;Will hold key value
WHILE.UK=0                  ;Repeat until any key hit
    UK=Key?!                    ;Get key, if any
    IF.UK=>0                    ;Any key hit?
        LoopBreak=2                 ;Exit WHILE if so
    ENDIF.
    Port="adc read " + UP(A)    ;Request ADC UP read
    UA=Port?V                   ;Read returned data
    V=UA * K                    ;Convert to volts
    Mtr0=V + " V"               ;Display value
WEND.                       ;Back for next pass
Mtr0=                       ;Close meter
Port#O=0                    ;Close COM port

See also Macro Examples and Mini-Apps, USB / Serial Communications Port Access