Hi,
I have to measure individual voltages in a 14 in series battery pack and - of course - it has to be galvanially separated. Each pack has a voltage range of 2.5V up to 4.3V which adds up to +55V.
With 14 devices in espeasy I will reach its limitations, so I hope that upyeasy will be my solution with an esp32, once I get it up and running.
FIrst approach: use ADS1115 with voltage dividers. Problem here is, that every little failure in calibration adds up badly...
Second approach: use ADS1115 but hook an IL300 linear optocoupler in between. But this is not enough, it needs a complex opamp before and so on, which leads to a quite complex setup.
Third approach: optical isolation of i2c. Problems here:
1. I have no clue of that in a hardware perspective
2. does it work with espeasy
3. every ADS1115 can only measure one channel instead of 4, which limits the whole setup to 4 channels because ADS is limited to 4 addresses...
Does anyone have an Idea for me?
Best regards
Karl
Measure Voltage - galvanically separated
Moderators: grovkillen, Stuntteam, TD-er
Re: Measure Voltage - galvanically separated
There are galvanic isolators which can handle digital signals up to several MHz.
These have often some kind of transformer like separator. So these can be used for SPI-like speeds.
These are bi-directional.
For example Ti has some: http://www.ti.com/isolation/digital-iso ... rview.html
These have often some kind of transformer like separator. So these can be used for SPI-like speeds.
These are bi-directional.
For example Ti has some: http://www.ti.com/isolation/digital-iso ... rview.html
Re: Measure Voltage - galvanically separated
sorry, i totally missed your post!
i wonder whether there isn’t a circuit which does exactly that....
i wonder whether there isn’t a circuit which does exactly that....
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