2021-06-18, 07:05 AM
I was able to put a volt meter on my senders tonight and was surprised to discover affinite was indeed correct regarding voltages at the tank senders. The port fuel tank is about half full (by depth) and measures 3.2 volts. The starboard tank 2/3rds full and measures 2.8 volts. Obviously that suggests an empty tank would have a voltage in the neighborhood of about 6.5 volts, which is above what the ADS1115 can handle.
I'm still not exactly clear. Do I still need a 1k resistor in line of the positive side? Or would something smaller work. Do I need a divider? And if so, with these small differences in voltage, what would the resistors be?
I've learned a lot so far, but I'm not ready to start frying ADS1115s just to test ideas. Id kind of would rather have it right to begin with.
I'm still not exactly clear. Do I still need a 1k resistor in line of the positive side? Or would something smaller work. Do I need a divider? And if so, with these small differences in voltage, what would the resistors be?
I've learned a lot so far, but I'm not ready to start frying ADS1115s just to test ideas. Id kind of would rather have it right to begin with.