It is a very usefel multimeter that must not missing from any laboratory
With this useful meter you can measure
and it can also recognize the pins of each component!
Ok,let’s begin,the circuit is based on an Atmega8
you can find needed files here.It’s included hex file, epprom file and configuration bits as well.
Here are eagle files for thorough hole component
here i have pcb with smd components
Circuit is very easy and it doesn’t has something special
at the next photo ,you can see a resistor. I place this resistor because i am going to use the multimeter with a battery 9V. So,i would like to reduce the consumption of the circuit. Without the battery its around 60mhA, but with this its around 13mhA
the next photo you’ll see is the pcb with the display. I have to mention that component i use are not those in the photos,these are just for testing purpose. Components, especially resistors must be 1% tolerance and good quality of capacitors for the best accuracy
and here is a piece of pcd with pins ready for inserting different size components