I have gotten the transmitter from this sight wired it with power supply (12v) or (10v)if I grab power from the vfd.
I followed the diagram from this site along with the arduino code. connected it to a multi-meter and it doesn’t work. verified I am getting 5v from i2c. I’m using the arduino mega with the a i2c shield from this site.
i ran same setup here and it works as expected.
what does it show on the meter while you read current?
do you have one another meter, if you do can you measure voltage across the screw terminals.
I’m not showing anything on milliamps (0.00) lm not getting anything across the terminals with the other meter. I can read the resistance, and it changes with the code but it won’t do millamps.
when everything is connected it will read the same voltage as the power supply across the terminals.
because meter is connected in series and and will work as a bridge ( make sure you set meter to read milli amps)
is is possible meters milli amp fuse is blown? looks like thats the case. if there is no voltage across the terminals
yeah some times the value spikes. but i believe it was an issue with the code. the other issue is the multi meter is displaying half of the the code is outputting.
you can change this part
for (int i=290; i <= 1500; i++) ///////to use this code with 4-20mA Hardware
and adjust the i values based on your requirements
I have another issue. The 4-20ma is not changing values anymore. Connection are the same and i uploaded the old code to test it and its still not changing