Re: help plz
In case you do not want to use a microcontroller, but just want to build a simple measuring and displaying circuit, for example, by using a ICL7107, it can be used for measuring your output range of sensor (some hundreds milivolts) and drive 3-1/2 7-segment LED display (please check this IC datasheet, and it is very popular).
So you will need to connect pins for hundreds and tens segments for number 28, 29, omit the pins for units and thousands. That's all.
The applications and typical circuit for ICL7107 is included in its datasheet.
nguyennam