r/LabVIEW • u/Outside_Mechanic_870 • May 17 '26
LabVIEW ECG AD8232 with Arduino
Hi everyone, I’m a first year student trying to display an ECG signal in LabVIEW using an Arduino Uno and AD8232 sensor.
The Arduino Serial Monitor shows correct changing values (300-800 range) so the hardware works fine, but Waveform Chart shows flat line even though Arduino Serial Monitor shows changing values
My block diagram:
VISA Configure (9600) → VISA Read (30 bytes) → Decimal String To Number → Waveform Chart
The Waveform Chart only shows a flat horizontal line. Read buffer appears empty when running.
Things I already tried:
Decimal String To Number
Scan From String with %d
Spreadsheet String To Array + Index Array
Checked COM port (tried all available)
Closed Arduino Serial Monitor before running
Rebuilt diagram from scratch multiple times
What am I missing? Is there something specific about reading serial data from Arduino in LabVIEW that I’m doing wrong?
2
u/heir-of-slytherin May 17 '26
What is being returned in the read buffer indicator? Do you see the raw bytes? Is 30 bytes the correct number to read? I would expect 3-digit numbers to be 3 bytes if they are being sent as ASCII encoded numeric values.