I have an oxygen sensor that I need to read to two decimal places and need the range from 0% to 100%.
Please correct me if I am wrong, but I therefore need 0-100 in .01 steps = 0=9,999 so 10000 expressed in decimal: 512 128 64 32 16 8 4 2 1 = 9 bit with base 0 so 9 bit probably exist, so 10 bit add required? I will then need a programmable gain amplifier.
I practiced with the ADS1115 and found that this 16bit add with pga did a good basic job but the readings fluctuated too much and were not repeatable.
The O2 sensor I am using has a 0-100 linearity and give 9-13mv in air.
What would be my best option for this application. Would it be necessary for an instrumental amplifier?
What precautions should I take with respect to getting accurate repeatable results in terms of shielding etc.
Sheilded cable from O2 sensor?
I would like the final data in i2c format.
Many many thanks in advance.