How to set the gain x4/x15

Modules Microcontroller Programmer - Experimenting Project
1

In oder to set the gain for the analoge inputs to x15 is it possible to to it in the c# software or do I have to exchange resistors?
Thanks in advance

2

vergo to mention; I use a VM110 USB Experiment interface board…

3

You have to install R8 (for A1) or R9 (for A2) 715 ohms.
By doing this you get gain x15.

Gain A1 = 1 + (R10/R8)
Gain A2 = 1 + (R11/R9)

4

Thanks. My board is allready assembled, I have R8-R11 all on my board but gain is 1x. So is there a way I can change that with software-code?

5

[quote]So is there a way I can change that with software-code?[/quote]Sorry, but this is not possible.
If you have VM110N then you have to assemble R7 to set the gain of A1 and R13 to set the gain of A2.

Gain A1 = 1 + (R8/R7)
Gain A2 = 1 + (R20/R13)

R8 and R20 are both 10k and they are assembled on the board.

6

all right! thank you very much!