Hi
I got AC voltage sensor ZMPT101B and I need to use it to provide my arduino auno with AC voltage in order to be able to do some processing on it .
I have applied 220V AC but the output was around 2.4 V DC when I measure it by multi meter and no AC output coming out from the sensor at all.
I used arduino input A0
any idea please
How did you measure that? As far as I found documentation about that Chinese stuff, it's a simple transformer with an opamp behind it. So you should get an Arduino compatible voltage to measure. The multimeter will average the output voltage (which is in the range 0-5V) so you should get 2.5V if the potentiometer is calibrated correctly. If you measure the voltage on the A0 pin fast enough, you'll see that it's showing a sinus curve.
Hi
As I know the multimeter must read the AC also but at apply the 220VAC the output of the sensor gives 2.5 DC .
i need to get AC output so i can apply it on the arduino
is this sensor gives AC or DC output ??
ZMPT101B applies to the transformer, can you post a link and / or datasheet for your module?
Maybe this? Has a LM358 op-amp, but that's all I can tell from the pictures.
https://www.ebay.com/itm/Active-Single-Phase-Voltage-Transformer-High-Stability-AC-Voltage-Sensor-Module/253530950332?_trkparms=aid%3D888007%26algo%3DDISC.MBE%26ao%3D1%26asc%3D52569%26meid%3D4da25bc7f5ed47159f70ff1bbf7f386d%26pid%3D100009%26rk%3D1%26rkt%3D1%26sd%3D121438904988%26itm%3D253530950332&_trksid=p2047675.c100009.m1982
Probly a dumb question, but did you measure output with your DMM set to AC volts?
As I know the multimeter must read the AC also but at apply the 220VAC the output of the sensor gives 2.5 DC .
The multimeter expects AC in AC mode but the output of the module is a DC sinus wave that alternates between 0V and 5V. 2.5V AC would alternate between -3.5V and 3.5V (because the multimeter shows RMS). As the voltage never drops below 0 the multimeter will not show AC voltage.