I just saw your thread now, I have the same issue… My setup:
I get just crap. 0.46V all the time from the adc_sensor until I remove it from the A0 .
I use a Amica Nodemcu
Hi, my setup is working Okay and is repeatable, just trying to find a way to offset the zero.
So In my configuration I added another sensor to monitor the raw reading when I have the calibrate linear filter applied to the main Measured Current…
- platform: ct_clamp
sensor: adc_sensor
name: “raw values”
If you look at your logs you will see for example 0.01801 represents 6.42298 A, this is implemented in the filters, - calibrate_linear:
forget using the adc_sensor for your reading.
[14:15:52][D][sensor:092]: 'adc_sensor': Sending state 0.41895 V with 2 decimals of accuracy
[13:49:04][D][sensor:092]: ‘raw values’: Sending state 0.01801 mA with 5 decimals of accuracy
[13:49:07][D][ct_clamp:051]: ‘Measured Current’ - Raw Value: 0.02A
[13:49:07][D][sensor:092]: ‘Measured Current’: Sending state 6.42298 A with 2 decimals of accuracy
[13:49:14][D][ct_clamp:051]: ‘raw values’ - Raw Value: 0.02A
[13:49:14][D][sensor:092]: ‘raw values’: Sending state 0.01807 mA with 5 decimals of accuracy
My config, I added the "raw values so I could log the values easier.
sensor:
- platform: ct_clamp
sensor: adc_sensor
name: "Measured Current"
update_interval: 10s
filters:
- calibrate_linear:
- 0.0 -> 0
- 0.01826 -> 5.15
- 0.01952 -> 6.754
- 0.01925 -> 7.09
- 0.04057 -> 16.02
- 0.07834 -> 31.37
- platform: adc
pin: 17
id: adc_sensor
- platform: ct_clamp
sensor: adc_sensor
name: "raw values"
update_interval: 10s
unit_of_measurement: mA
accuracy_decimals: 5
My setup for the initial calibration.
Portable electric heater with low (3.5 A) and high (6.9 A) low/high selector, CT and Multi meter in series measuring amps.
so taking the reading from the logs and then writing the linear values in the configuration gives a good repeatable reading.
My issue is when the load is zero i get an erratic reading. drifting between 0.2 a 0.5 A.
For the higher calibration values i transferred my setup to measure the main incoming supply to the house.
I then was able to put increased loading on the the CT as my Fluke can measure 10 Amps max,
With this I was able to calibrate the higher loads,16 A and 31 A by comparing readings from my smart meter and the readings from the log and modified the calibration linear table accordingly.
Thank you, I will try this and see if I can get it to work
did you get this working? Im stuck at the same level you were.
Hi,
I´m trying to connect a SCT013-20A-1V to ESPhome.
I cannot find any schematics for this CT (1V). Do you know where i can find one?!"
Best regards
Petter
1 Like
Sweet!
Works fine now!
Thanks a lot!
@MarkB1,
I’m trying to do the same thing with the SCT013 100A/50mA.
Can you share your final wiring diagram and ESP code? I want to do this with a D1 mini, I assume I can just map the pins from the nodemcu to the D1 mini?
Thanks!
Get one of these
ESP8266 Mains Current Sensor - Wemos - Current transformer - SCT013 - 100A/50mA
code
esphome:
name: wemos_d1_mini_1
platform: ESP8266
board: d1_mini
wifi:
ssid:
password:
power_save_mode: none
manual_ip:
static_ip: 192.168.0.107
gateway: 192.168.0.2
subnet: 255.255.255.0
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Wemos D1 Mini 1 Fallback Hotspot"
password: "VGaeoNIRWbVa"
captive_portal:
# Enable logging
logger:
# Enable Home Assistant API
api:
ota:
# Enable Web server.
web_server:
port: 80
text_sensor:
- platform: version
name: "ESPHome Version Wemos D1 Mini 1"
# Example configuration entry
- platform: wifi_info
ip_address:
name: ESP IP Address Wemos D1 Mini 1
ssid:
name: ESP Connected SSID Wemos D1 Mini 1
bssid:
name: ESP Connected BSSID Wemos D1 Mini 1
# Sync time with Home Assistant.
time:
- platform: homeassistant
id: homeassistant_time
binary_sensor:
- platform: status
name: "wemos_d1_mini_1 Status"
sensor:
- platform: ct_clamp
sensor: adc_sensor
name: "Measured Current"
update_interval: 10s
filters:
- calibrate_linear:
- 0.00009 -> 0.0
- 0.01300 -> 1.6
- 0.01438 -> 1.94
- 0.02088 -> 3.25
- 0.02184 -> 3.51
- 0.02312 -> 3.72
- 0.02600 -> 4.34
# - 0.02740 -> 5.0
# - 0.04340 -> 6.75
# - 0.08990 -> 17.1
- platform: adc
pin: A0
id: adc_sensor
# Sensors with general information.
# Uptime sensor.
- platform: uptime
name: Wemos D1 Mini 1 Uptime
# WiFi Signal sensor.
- platform: wifi_signal
name: Wemos D1 Mini 1 WiFi Signal
update_interval: 60s
status_led:
pin:
number: D4
inverted: FALSE
5 Likes
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
4 Likes
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?
Edit
I’ve just read this:
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.
1 Like