hello
I have VM110N board , and i tried to connect temp sensor LM35 DZ to the analog input
i connect GND to GND to GND of power suply
A2 to the output of sensor
5 v to the sensor from power supply
i removed the jumper
and still did not get liner or acceptable value
Turn the trimmer potentiometers ATT1 and ATT2 to max position clockwise.
Please check the output voltage from the LM35DZ with a multimeter.
firstly thanks for reply
i have Q , is the analog input A1 or A2 sensitive to the change of the input voltage , i.e can sence up to mV
Page 15 of the manual has the schematics.
If you install resistor R53 you turn the OP-AMP for the analog input A1 from a voltage follower config to an amplifier config. Using a 4.7K Ohm resistor will change the input range of A1 to about 0V … 1.6V. That should be a good match for the LM35. That range will be divided into 256 steps, so the setup would be able to detect better than one degree Celsius.
The same goes for input A2 with resistor R54.
Regards,
Jan