I have a normal 3 line (V,GND,SIG) Analog pressure sensor and I want to connect and read data using Raspberry Pi GPIO. Can anyone help with a Python code?
Raspberry pi does not have any Analog input so you will need an external ADC. Your sensor is 5V, so go with a 5V torrent ADC. you can use ADS1115 because it has 4 ADC channels so you can connect upto 4 sensor to one board. it has inbuilt voltage ref so you dont need any external Vref. its a 16 bit ADC so your readings will be highly accurate. it also has gain multiplier. its input are 5V torrent.
You can find the python code for ADC ADS1115 over here
if you are looking for video tutorial for connecting an ADC with raspberry pi please check over here. interfacing ADC with raspberry Pi
You are going to have a few problems with the Pi. These problems are not insurmountable.
- The first is the Pi does not have any analog inputs.
- Second the sensor requires 5V as input and the Pi operates at 3.3V and will not tolerate 5V.
This tutorial on reading analog values with an ADC an the PI includes Python code.
You will also need a way to convert the 5V sensor to 3.3V for the Pi (e.g. logic level shifter, a voltage divider etc.) This related question will have some additional specifics.