07-28-2026, 06:12 PM
Hello,
I am using Analog 1 and 2 for voltage inputs (A0_gnd and A1_gnd on the ADS1115) and these are working well.
I am trying to add a 4-20ma sensor to Analog 3 or 4. It is a 12VDC sensor with 2 wires. Red to +12VDC power, and black to current sense. This 12VDC supply is the same supply that powers the B8.
The B8 on either Analog 3 or 4 doesn't show the current consumption - just sits at 1.49mA which is what it shows with nothing connected either.
If I use a DMM on 20mA range between the black wire and 12VDC GND I get 9.9mA which is reasonable.
Does the ADS1115 need some sort of ground bond to work in current mode? What is the gnd return path for Analog 3 or 4?
I am using Analog 1 and 2 for voltage inputs (A0_gnd and A1_gnd on the ADS1115) and these are working well.
I am trying to add a 4-20ma sensor to Analog 3 or 4. It is a 12VDC sensor with 2 wires. Red to +12VDC power, and black to current sense. This 12VDC supply is the same supply that powers the B8.
The B8 on either Analog 3 or 4 doesn't show the current consumption - just sits at 1.49mA which is what it shows with nothing connected either.
If I use a DMM on 20mA range between the black wire and 12VDC GND I get 9.9mA which is reasonable.
Does the ADS1115 need some sort of ground bond to work in current mode? What is the gnd return path for Analog 3 or 4?