The TL;DR is that I got excited about looking into how to use Split Phase Current Measurement kit, and trying to figure out how to avoid installing some arbitrary annoying PHP software that is called ESPMon.
I soon started reading the docs on FreeRTOS, and quickly bought:
- I2C Hygrometer SI7021
- I2C Barometer MPL3115A2
- SPI based on a ATM90E32 Split Phase Current Measurement
With the intent to spew data into a MQTT queue installed inside my home network.
Running make menuconfig will allow one to modify the bulk of what is in there, but the defaults do the following. Data points all have the same structure:
{"t":1231231,"v":832.234662}
t is the ESP32's millis() clock that eventually rolls over. V is the
| Topic | Data |
|---|---|
| heartbeat/pwr | Heartbeat message with a brief timestamp. Messages here are strings, and are triggered when the SPI poll has errant data |
| heartbeat/wxpwr | Heartbeat for main monitor loop. Contains slightly different data values |
| sensor/wx/p | Pressure, in mBar |
| sensor/wx/pth | Temperature of the barometer sensor. Could be used for |
| calibration | |
| sensor/wx/rh | Relative humidity in %RH. Is not clipped to 100 and may be wildly off during temperature shocks |
| sensor/wx/rht | Relative humidity sensor temperature in C. Could be used for calibration |
| sensor/power/f | Frequency, in Hz |
| sensor/power/v1 | Phase 'A' voltage, RMS |
| sensor/power/v2 | Phase 'C' voltage, RMS (not entirely sure how this is different from v1 above |
| sensor/power/i1 | Phase 'A' current (amps) |
| sensor/power/i2 | Phase 'C' current (amps) |
| sensor/power/I | Total current (A+C) |
| sensor/power/ap | Apparent Power |
| sensor/power/ap | Power Factor |
| sensor/power/t | Temperature sensor |
| sensor/power/f | AC Frequency |
| sensor/power/w | Power (Watts) |
- Firstly, you need to get the esp-idf. That is outside the realm of this manual, but is necessary to work properly.
source path/to/esp-idf/export.sh # get the ESP-IDF build environment
cp sdkconfig.sample sdkconfig
make menuconfig # Modify the build parameters (eg, Wifi SSID, Password, MQTT etc) under the "House Monitor Config"
make -j8 #because I canDo you really need to to ask that?
Outside the normal I had an itch answers, consider the fact you are here continuing to read this sentence; impling that you too, want to invest time tinkering in homebrewing your own tools.