PZEM-016 with ESPHome, OLED display and 2 Outputs

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#1

I modified a PZEM-016 putting inside a Wemos D1 mini with ESPHome firmware and an oled display to show relevant readings. PZEM-016 has an rs485 interface, so to connect it to Wemos d1 rs485 chip must be removed and voltage level has to be shifted to 3.3V using two 2k2 resistors. I used A and B pin on the old rs485 connector to create two digital outputs that can be used ie to drive two relais module.

ESPHome-wemos-d1-pzem016-display_bb
ESPHome-wemos-d1-pzem016-display_bb2154Ă—1425 822 KB

IMG_20200429_104740
IMG_20200429_1047402448Ă—3264 1.85 MB
2020-04-30 00_55_38-Panoramica - Home Assistant
2020-04-30 00_55_38-Panoramica - Home Assistant432Ă—531 20.5 KB

The project here:

1 Like
#2

This is great!! Do you think that it will work with this one?

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#3

Unfortunately no. All peacefair meters with display doesn’t have serial output so can’t be used in combination with an esp8266 device. This is the reason why I added a display to a pzem-016.

2 Likes
#4

Thanks again for sharing this project, I would definitively work on this soon.

#5

Hi, I want to ask will it work with PZEM-017?

#6

Yes it will definitely work and if you do not want to remove the chip, use a 485 to TTL converter

#7

hello, I tried to make the change on the pzem-016 but I can’t get any output value on home-assistant.
I tried to reverse tx and rx as recommended by someone but nothing changes.
Is it possible to check in another way if some value is produced on the 2 pins to test if the pzem is working?
Thank you