Arduino energy monitor, using SCT-013-030 current sensors

Project Links :

• Software part, on GitHub
• Hardware part, on Thingiverse

This is a full energy monitor project :

• You can manage 1 to 6 sensors.
• You can configure it through USB (see below).
• It can communicate through USB, with any homemade software.
• It can communicate with any Home Automation System supporting MySensors (I'm using Domoticz).
• Full source is provided, you can customize it.

Needed parts :

• For each sensor :
  • 1x SCT-013-030 current sensor (AliExpress).
    • It also works with SCT-013-000 (AliExpress) (see below).
  • 1x 3.5mm Audio jack socket (AliExpress).
  • 2x 100k Resistor (AliExpress).
  • 1x 10μF Capacitor (AliExpress).
• 1x NRF24L01 wireless module (AliExpress).
  • 1x 10μF Capacitor (AliExpress) (see below).
• 1x Arduino Nano (AliExpress).

Instructions :

• Before to print case, you can specify how many sensors you have.
  • You can define the exact number of sensors, or plan more. Each socket will be pre-cut for future use.
• Follow joined scheme for assembly.
  • Each sensor have to be connected to A0, A1 and so on...
• Upload sketch to the Arduino Nano.
• Connect it to any computer for configuration (see below).
• Let's play...

Configuration parameters :

• Number of sensors,
• Sensor calibration (Vrms, ICal, IOffset),
• Sample frequency,
• Transmission frequency,
• Toggle MySensors on/off,
• Toggle serial output on/off.

Configuration will be saved to eeprom.

Using serial console, you can communicate with the sensor. For example, using minicom (? for show help) :

$ minicom -b 115200 -D /dev/ttyUSB0
 __ __ ____
| \/ |_ _/ ___| ___ _ __ ___ ___ _ __ ___
| |\/| | | | \___ \ / _ \ `_ \/ __|/ _ \| `__/ __|
| | | | |_| |___| | __/ | | \__ \ _ | | \__ \
|_| |_|\__, |____/ \___|_| |_|___/\___/|_| |___/
 |___/ 2.3.1
Energy Sensor has powered up
Energy Sensor (can use up to 6 sensors)
F0: : Sample frequency in seconds (F0:5)
F1: : Send frequency in seconds (F0:60)
E#:[0|1] : Enable Sensor # (E0:1[;E1:1])
V<#:val> : Set Vrms (V0:230[;V1:230])
C<#:val> : Set ICal (I0:29.95[;I1:29.98])
O<#:val> : Set intensity offset (O0:0.05[;I1:0.07])
S[0|1] : Toggle Serial output
T[0|1] : Enable MySensors transmission
M<#> : Sensor mode (1: power, 2: current, 3: power+current)
all commands are case insentitive
F0:2;F1:60
E0:1:V0:230:C0:29.40:O0:0.01
E1:1:V1:230:C1:32.00:O1:0.05
S0;T1
M3

Latest lines show current configuration.

Warning : If you are using SCT-013-000 instead of SCT-013-030, you have to add burden resistor. NRF24L01 may have connection issues. You have to add 10μF capacitor between PWR and GND.

You'll be handling dangerous voltages. I decline any responsibility in case of any incident or accident.