Hello everyone,
I m Nikunj .
I wanna make a digital weight machine using Arduino . But i m confused which board to choose.
I m a manufacturer of digital weight machines since 15 years.
These machines are made with 40 pin , 32 bit microcontroller.
Can anyone pls guide me which board i should go for. ??
plus the load cell which i use has 2 wires only.
can anyone please guide me with which board i should prefer ??
Awaiting Reply ...
Thanks.
The Arduino board is not the problem, the conversion from analog to digital is the hard part.
The Arduino Uno has only 10 bits ADC.
The Arduino Due has 12 bits ADC.
That is why an external digital ADC is used, for example the HX711. I think it is possible to connect one, two or four load cells to that chip.
The HX711 can be connected to the most simple Arduino board, for example a Arduino Uno with ATmega328P microcontroller.
The ATmega32U4 (used in the Arduino Leonardo) has an option to set a gain of 200 for a differential analog value of two analog inputs. The resulting accuracy will be only 7 or 8 bits. That makes it possible to connect an analog sensor without OpAmp to the ATmega32U4, but only for a rough indication.
A load cell with two wires only ? The three or four wires are needed to reduce the noise, the temperature influences, and the offset, and maybe more. I say that three or four wires are absolutely needed.
Perhaps it is possible if you measure the temperature, and put that into a calculation for the final weight. Could you make a photo of the load cell ?