Pzem 004t energy module

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giovamec
Posts: 2
Joined: Fri Apr 12, 2019 6:21 pm

Pzem 004t energy module

Post by giovamec » Wed Jul 03, 2019 1:05 pm

Dear Team
I'm your customer
and I'm trying to use "Pzem 004t energy module" with MAXI. this works only on the pin headers of serial 2 (RX2;TX2 pin 17 and 16).
I tried on serial 1 or with a soft serial on the other pins but with a negative result.
could you tell me which pins to try? ie on which pins there are lower protection resistances to be able to read the signal?
Giovanni

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Jarda
Posts: 17
Joined: Fri Dec 14, 2018 10:52 am

Re: Pzem 004t energy module

Post by Jarda » Mon Jan 20, 2020 12:39 pm

Dear Giovanni,
Serial 1 has higher protection resistances. When you use Serial 2 and it is working, we propose to use Serial 2. The other I/Os with lower impedances are SPI lines (be careful here because the SPI is shared), or you can use pins common with Outputs where is also protection impedance lower (for example Digital 1-5), but this can have influence to outputs. In general - serial 2 is the solution ;-).

Jarda

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