powermeter

A not so simple but very flexible smart meter based on ESP32. It supports MQTT, live monitoring via web interface, IO ports ( can be switched depending on measured values ), a simple OLED driver for simple value reports, editable opcode sequences per channel and group management. And the best is: everything can also be set via the web interface and has immediate effect and invites to play to improve the understanding of AC voltage/current or DC voltage/current.

Note: From version 2022110101 a complete reconfiguration is required.

Danger: Working with 110V or 230V is dangerous!

install

Clone this repository and open it with platformIO. Remember, the SPIFF must also be flashed. On a terminal in vscode you can do it with

pio run -t uploadfs
pio run -t upload

After that, take a look at your monitorport ...

Read config from SPIFFS
scan for SSID "" ... not found
starting Wifi-AP with SSID "powermeter_aadee0"
AP IP address: 192.168.4.1
Start Main Task on Core: 1
Start NTP Task on Core: 1
Start Measurement Task on Core: 0
Start MQTT-Client on Core: 1
Start Webserver on Core: 1
NTP-client: renew time
Start OTA Task on Core: 1
Failed to obtain time
NTP-client: Thursday, January 01 1970 01:00:07

When the output look like this, congratulation!

After the first start an access point will be opened with an unique name like

powermeter_XXXXX

and an not so unique password

powermeter

After that you can configure the powermeter under the following IP-address with your favorite webbrowser

http://192.168.4.1 or powermeter_xxxxxx.local

how it works

At any time, all 6 adc channel are read in simultaneously regardless of the settings. Afterwards, these 6 ADC channels are distributed to 13 virtual channels with the help of editable microopcodes, each sample has a maximum of 10 opcodes available for real-time calculations (mixing, sum calculation, reactive power and so on). These 13 virtual channels can then be combined into a maximum of 6 output groups. For more information about how AC current or three-phase current and power calculations works, read here and here

sensor hardware

Sensors

SCT013-000 current sensor (~100A)

ZMPT101B voltage sensor (~250V)

ACS712 current sensor 5A, 20A and 30A

simple voltage divider

For ratio calculation see inline documentation via webinterface.

Display hardware

Uncomment in "display.cpp" the line of the display you want to use

//#include <Adafruit_SSD1306.h>
//#include  <Adafruit_SH110X.h>

Interface

live view

round trip

contributors

Every Contribution to this repository is highly welcome! Don't fear to create pull requests which enhance or fix the project, you are going to help everybody.

If you want to donate to the author then you can buy me a coffee.