I have a rather large load cell, 500KG, and I need to measure both tension and compression.
I have an ADS1115, a INA125P, and a few other supporting components. I followed a slightly modified version of this schematic except I modified it slightly for 5V bridge excitation. This is my schematic, please excuse the messiness, I have no idea what I am doing.
After reading the datasheet my understanding is that voltage applied to the IAref pin will be added to the output voltage. Then, I can use the gain and math with ADC values to get positive and negative load values from the sensor, centered around the middle of the 0-5V range with the 2.5V reference voltage.
This doesn't seem to work, I get 5.0V output to the bridge but I am unable to adjust the gain to get above 2V or so on the output pin. Is there something wrong with my schematic? I should note I'm using 12V, so I should be above the dropout voltage.
If I return the IAref pin to ground would there be an easier way to offset the output and limit the output to 0-2.5V? Would it be easier or even possible to somehow measure a differential voltage using the adc1115 to use the signed bit to double my resolution?
Thanks in advance for any advice!