hello!
I'm stuck with a difficult task (at least for me
). I need to have the arduino output a voltage that ranges from 0.03mV to 15mV with an interval of 0.03mV, therefore something that goes like 0.03mV - 0.06mV - 0.09mV - 0.12mV and so on until 15mV!
Im not an expert unluckily I'm still learning, what would be an "easy" but still precise way to do this? I'm using it to feed the voltage into a maesurament instrumentation that usually is attached to a 3mV/V load cell that can measure up to 1000Kg and is powered by the instrument itself at 5v, so 3mV * 5v = 15mV / 1000kg = 0.015mV per Kg, but even a sensitivity of 0.03mV or 0.045mV is fine (so that I can measure the difference between 1,2 or 3 Kg. More than 3kg wouldn't be recommendable for me, but if it's close like 4 or 5kg i guess its ok). What I'm trying to do is simulate the load cell with arduino!
I read online about DAC but I cannot find one which is precise enough. I tried with the MPC4725, it has 12b. , therefore 4095 steps of about 1.2 mV for step so that 4095*1,2 = 4.9V which is too much! Someone told me to add resistors, but does that really work well enough?
Please keep in mind I'm not an expert at all therefore the easiest and best solution would be best, include please every information you can to be detailed!
Thanks a lot lot to everyone that helps me out!
Francesco