For the main power distribution in my house, I also build a powersensor. The basic idea is the same as for this sensor. But the electric meter is already build into the distribution cabinet, so this power meter uses the so-called S0 bus of the power meter inside the cabinet.
The meter can count W/h summed up for all three power phases and the peak-to-peak voltage of one of the main powerlines entering my house.
The data is transmitted also directly to the data collecting web-site.The power and voltage values are sent every minute to the web-site. The administrative sensor are transmitted only every 10 minutes to the web.
Senors
The following sensors are provided by this sensor node:
| Uploads OK | Number of successfull data uploads |
| Network restarts | Number of WLAN reconnects etc. |
| Uploads failed | Number of upload errors since the last WLAN reconnect |
| VCC | The internal power supply voltage |
| Netzspannung | The main power peak-to-peak AC voltage |
| Netzteil | The temperature of the build in power supply |
| Energieverbrauch | The energie consumption of our house during the last measurement intervall, means 1 minute |
The data can be displayed on the web site in various ways.
Hardware
Simple ABS cabinet. Powersupply is a compact MEANWELL AC/DC converter. The mains voltage is measured via a small transformer and some glue ciruits. The main processor is an arduino clone with onboard ESP-8266 WiFi.
Schematic
The yellow squares are referenced in the measurement section!
Bill of material
|
Part |
Value |
Device |
Package |
Description |
|
C1 |
330nF |
C2.5/6 |
C2.5-6 |
CAPACITOR |
|
C2 |
10uF |
CE01A |
CE01A |
Electrolytic capacitor |
|
D1 |
Power |
DL03N |
DL03N |
LED |
|
D2 |
WLAN |
DL03N |
DL03N |
LED |
|
D4 |
Pulse |
DL03N |
DL03N |
LED |
|
D5 |
ERROR |
DL03N |
DL03N |
LED |
|
D6 |
LIFE |
DL03N |
DL03N |
LED |
|
F1 |
T0,1A |
SH22,5A |
SH22,5A |
FUSE HOLDER grid 22,5mm |
|
IC1 |
DS1820 |
DS1820 |
TO-92 |
1-Wire Digital Thermometer |
|
JP1 |
230VAC |
M023.5MM |
SCREWTERMINAL |
Standard 2-pin 0.1" header. |
|
JP2 |
Zähler |
M023.5MM |
SCREWTERMINAL |
Standard 2-pin 0.1" header. |
|
MEANWELL |
IRM-05-5 |
IRM_05/10 |
IRM_05/10 |
5 watt |
|
NANOESP |
ARDUINO_NANO2 |
nanoESP |
Pretzl board | |
|
R1 |
1K0 |
R-EU_0207/10 |
0207/10 |
|
|
R2 |
1K0 |
R-EU_0207/10 |
0207/10 |
|
|
R3 |
10k0 |
R-EU_0207/10 |
0207/10 |
|
|
R4 |
10K0 |
R-EU_0207/10 |
0207/10 |
|
|
R5 |
4K7 |
R-EU_0207/10 |
0207/10 |
|
|
R6 |
390R |
R-EU_0207/10 |
0207/10 |
|
|
R7 |
390R |
R-EU_0207/10 |
0207/10 |
|
|
R8 |
3k9 |
R-EU_0207/10 |
0207/10 |
|
|
R9 |
390R |
R-EU_0207/10 |
0207/10 |
|
|
R10 |
390R |
R-EU_0207/10 |
0207/10 |
|
|
R11 |
390R |
R-EU_0207/10 |
0207/10 |
|
|
R12 |
2k2 |
R-EU_0207/10 |
0207/10 |
|
|
1 |
Gerth 0,5VA 9V |
EE20-1 |
EE20-1 |
TRANSFORMER |
Measurement
AC Input
Signal at points 1-2: 
Signal at points 0-4: 
Mains input voltage 225,7VAC-p2p
Power consumption: max=0,0211A avg=0,0127A -> 2,8W
Supply voltage (0-5): 5.01VDC
Reference voltage (0-1): 2.50VDC