I have a problem for sending signal to relay module.
What I know is,
when relay module get a high signal from Arduino, COM and NO is connected.
On the other hand, when relay module get a low signal from Arduino, COM and NC is connected.
By the way there was a problem at signal.
I've commanded Arduino to send low signal. But Arduino doesn't send low signal to relay module.
Here is my main part of sketch and Serial monitor
In Serial monitor, you don't need to mind below things
Calibration word 2 = DC1B 56347
Calibration word 3 = 8C1A 35866
Calibration word 4 = BD1D 48413
c1 = 22957
c2 = 1693
c3 = 756
c4 = 560
c5 = 880
c6 = 27
D1 - Pressure raw = 17629
D2 - Temperature raw = 28200
Real Temperature in C = 27.00
Compensated pressure in mbar = 10002
Compensated pressure in mmHg = 750.21
What you should mind in Serial monitor is just
You can see 'else' is working well so that Serial Monitor prints "LOW pressure"
But in 'else',
'digitalWrite(3, LOW)' doesn't work.
Because you know, Serial Monitor doesn't print "LOW"
Serial Monitor prints "LOW" only if port 3 send low signal.
So I want to solve the problem that port 3 doesn't send low signal,
even though 'Serial.println("LOW pressure") is working well.
I'm South Korean, and I have low level for english so you can get hard to understand what I'm
Please understand me.