ADS1115

ADS1115 was designed as a 16-bit analogue to digital converter (ADC) IC. It comes with a  built-in preamplifier used to amplify low voltage signals. ADS1115 chip takes voltage signals as an input and provides digital values output.  The preamplifier section amplifies low voltages. It has an on-chip power supply regulator that provides analogue power eliminating the need for an external supply regulator. You can directly interface with a bridge sensor. This IC allows you to easily read load cells to measure weight and load cells can be easily integrated into your project. ADS1115 comes with two analogue input channels. Channel A the internal integration of 128, 64  constant gain. On the other hand, channel B has a constant gain of 32.

This chip is mainly suitable for weight measurement applications. The load cells that are used in weight scaling applications give very low output voltage in the order of millivolts. Conventional, ADC ICs are not able to measure such low voltage with good resolution or accuracy. Hence ADS1115 ADC can measure these low-scale voltages and convert them into digital values. The presence of a preamplifier inside the chip makes it suitable for such applications. Thus with the two ADC channels and each channel converts an analogue signal into a 28-bit long digital value. And these standard digital output values can be used by a microcontroller.