That’s a super neat and clean little board!
I have a question, how do you get voltage reported to HA?
I can get the Amperage with the ct_clamp platform no problem, but I cannot wrap my head around implementing lamda to do the math and send both amps and voltage to HA.
Instead of relying on the terrible ESP8266 ADC, and you will get a lot more information:
I don’t believe you can get Voltage from the sensor (assuming you are talking about the mains voltage.
If you mean the Voltage reading from the clamp then change the internal: to false as I have done below:
- platform: ct_clamp
sensor: adc_sensor
name: "raw values"
internal: false
update_interval: 10s
unit_of_measurement: mA
accuracy_decimals: 5I just thought I’d put my config in here if anyone likes the look of it, it deesn’t report any fluctuations below 0.1A, can be changed.
sensor:
- platform: ct_clamp
sensor: adc_sensor
name: "True Current" # This first sensor gets the Amps, note that is set to internal only.
id: the_clamp
internal: true
update_interval: 10s
filters:
- calibrate_linear: # Calibrate your own stuff here, mine is only used for the car charger, therefore I'm pulling approx 28A
- 0.00026 -> 0.0
- 0.02856 -> 8.37
- 0.09489 -> 27.9
- platform: template
name: "ESP8266 Current" # This sensor is the one that gets seen by HA, if the reading is below 0.1A then it reports 0, keeps your 0 at 0
id: templated_sensor
lambda: |-
if (id(the_clamp).state > 0.1){
return (id(the_clamp).state);
} else {
return 0.0;
}
device_class: current
update_interval: 10s
accuracy_decimals: 2
unit_of_measurement: A
- platform: template
name: "ESP8266 Watts" # This sensor converts the Amps to Watts (this is assuming that your voltage is 230, if not change the 230 accordingly)
id: esp_watts
lambda: |-
return id(templated_sensor).state * 230;
accuracy_decimals: 2
update_interval: 10s
device_class: power
unit_of_measurement: W
- platform: total_daily_energy # This sensor will give you a Daily kW reading
name: "ESP8266 Daily Energy"
unit_of_measurement: 'kW'
power_id: esp_watts
filters:
- multiply: 0.001
device_class: energy
- platform: adc
pin: A0
id: adc_sensor
- platform: ct_clamp
sensor: adc_sensor
name: "raw values"
internal: true
update_interval: 10s
unit_of_measurement: mA
accuracy_decimals: 5
Thank you! The template was the part I was missing to get the second value to report to HA!
To be honest I have kind of migrated away from my original scheme and now use the PZEM-004 t
https://www.aliexpress.com/item/4000558302474.html?spm=a2g0o.productlist.0.0.795aea91zbaLDd&algo_pvid=f52d6305-6444-48ca-9848-c744910591af&algo_expid=f52d6305-6444-48ca-9848-c744910591af-3&btsid=0bb0624516214117394447424ef192&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
Far more accurate and very easy to communicate with.
I don’t modify my PZEM like some do, I just use a level shifter.
my code
# WeMos D1 Mini PZEM 004T V3 #
# Substitutions
substitutions:
# Device Names
device_name: "pzem_004t_v3_d1_mini"
friendly_name: "PZEM 004T V3 D1 Mini"
esphome:
name: pzem_d1_mini
platform: ESP8266
board: d1_mini
wifi:
ssid: "XXXX"
password: "xxxxxx"
power_save_mode: none
manual_ip:
static_ip: 192.168.0.104
gateway: 192.168.0.2
subnet: 255.255.255.0
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "PZEM004T V3 D1 Fallback Hotspot"
password: "A1i5751c9OoJ"
captive_portal:
# Enable logging
logger:
level: DEBUG
baud_rate: 0
# Enable Home Assistant API
api:
ota:
# Enable Web server.
web_server:
port: 80
text_sensor:
- platform: version
name: "ESPHome Version ${friendly_name}"
# Example configuration entry
- platform: wifi_info
ip_address:
name: ESP IP Address ${friendly_name}
ssid:
name: ESP Connected ${friendly_name}
bssid:
name: ESP Connected ${friendly_name}
time:
- platform: homeassistant
id: homeassistant_time
# LCD Display
i2c:
sda: D2
scl: D1
scan: True
display:
- platform: lcd_pcf8574
id: mydisplay
dimensions: 20x4
address: 0x27
lambda: |-
it.printf(0, 0, "DAILY ENERGY:%.1f kWh", id(${device_name}_daily_energy_total).state);
it.printf(0, 1, "POW:%.1f W", id(${device_name}_power).state);
it.printf(10, 1, "AMPS:%.1f A", id(${device_name}_current).state);
it.printf(0, 2, "%.1fV", id(${device_name}_voltage).state);
it.printf(8, 2, "%.1fPF", id(${device_name}_power_factor).state);
it.printf(14, 2, "%.1fHz", id(${device_name}_frequency).state);
it.strftime(0, 3,"%H:%M %d.%m", id(homeassistant_time).now());
it.printf(12, 3, "%.1f db", id(${device_name}_wifi_signal).state);
uart:
rx_pin: GPIO3
tx_pin: GPIO1
baud_rate: 9600
stop_bits: 1
sensor:
- platform: pzemac
current:
name: "${friendly_name} V3 Current"
id: "${device_name}_current"
voltage:
name: "${friendly_name} V3 Voltage"
id: "${device_name}_voltage"
energy:
name: "${friendly_name} V3 Energy"
id: "${device_name}_energy"
power:
name: "${friendly_name} V3 Power"
id: "${device_name}_power"
frequency:
name: "${friendly_name} Frequency"
id: "${device_name}_frequency"
power_factor:
name: "${friendly_name} V3 Power Factor"
id: "${device_name}_power_factor"
unit_of_measurement: pf
update_interval: 2s
- platform: total_daily_energy
name: "${friendly_name} Total Daily Energy"
id: ${device_name}_daily_energy_total
power_id: ${device_name}_power
filters:
# Multiplication factor from W to kW is 0.001
- multiply: 0.001
unit_of_measurement: kWh
icon: mdi:counter
- platform: integration
name: "${friendly_name} Energy Meter"
sensor: ${device_name}_power
time_unit: h
filters:
# Multiplication factor from W to kW is 0.001
- multiply: 0.001
unit_of_measurement: kWh
icon: mdi:counter
# Sensors with general information.
# Uptime sensor.
- platform: uptime
name: ${friendly_name} V3 Uptime
id: "${device_name}_uptime"
# WiFi Signal sensor.
- platform: wifi_signal
name: ${friendly_name} V3 WiFi Signal
id: "${device_name}_wifi_signal"
update_interval: 60s
binary_sensor:
- platform: status
name: "${friendly_name} V3 Status"
status_led:
pin:
number: D4
inverted: false
Regards,
Do you wire the board as the schematic on aliexpress shows and put mains power to the board?
Yes mains and the CT to the PZEM.
I also added
to power the LCD and with a diode in series on the 5VCC on the D1 mini.
Interface between the PZEM and D1 with a level shifter.
Works a charm and very accurate.
Gives you
Power (W)
Volts
amps
PF
Frequency
KWh totals
Where can I get one of this to buy in the USA?
Hi, I am trying to do the same as you but I am not sure that I understand how
Is this schematic correct?
And according to the formula on that site I need a 23.335 Ohm resistor so I am using 2 47Ohm resistors in parallel
The SCT-013-xxx CT Clamp does not need the burden resistor (shown in your diagram as “66”), The CT Clamp has this in it already. Other than that your diagram is correct. But one thing, there is an issue with these cheap clamps. The shielding may be connected to the ring, causing interference. Suggested to cut the plug off and hard wire.
Wonder if anyone can help with calibrating my readings. Using a SCT-013 clamp and this SCT013 board (ESP8266 Mains Current Sensor - Wemos - Current transformer - SCT013 - 100A/50mA | eBay) with a D1 mini board. Using the below values for calibration results in negative values for current and watts. These values at @240v
filters:
- calibrate_linear:
- 0 -> 0
- 0.01780 -> 4.72 # 1134w microwave (700w)
- 0.03571 -> 11.26 # 2702w kettle (2520-3000w)
I believe you are missing a time component.
Either use
time:
- platform: sntp
id: my_time
or
time:
- platform: homeassistant
id: homeassistant_time
It was perfect. I would like to add it in the Energy integration. How would I convert it to kWh? Sorry for the bother
Change "unit_of_measurement: ‘kW’ " for KWh, I don’t know if it’s right, but it appeared to me to integrate it in Energy
I’m not sure what you mean, there is an example of how to change W the kW in the post you referenced, kWh is a measurement of power used over a period of time.
I think in order for this integration to be added to the Energy Dashboard, you have to add it to the Recorder. Again, I’m not sure, but I think I’m right.
I don’t know if I did the right thing when converting from kw to kwh, but I wanted to do it to put it here
Looking at my ESP energy meter, I have the following.
total:
name: 'Full House Energy Meter Total'
id: sensor_total_energy
unit_of_measurement: 'kWh'
icon: mdi:circle-slice-3
state_class: total_increasing
device_class: energy
accuracy_decimals: 3
filters:
- lambda: return x * (1.0 / 1000);
If this is incorrect, I’m leaving the conversation for now, it’s late and I’m a little drunk 
I have connected a SCT-013-xxx (20A) CT Clamp exactly as described above, but I am not getting any readings via esphome. As soon as the sensor is connected: NaN. Without the sensor, the values fluctuate.
I have already cut off the connector and soldered it, no improvement. The contacts are correct, I have checked them several times. Even with a load of almost 9A: no measurement. I have already replaced the sensor and don’t know what to do. The capacitor points with negative to GND, doesn’t it?
It should not be due to the calibration, I have already tested the most different variants. The same with the ‘internal’ option.
Does anyone have any ideas? 🤷