I created an issue for it. I went for the YHDC SCT-013-030 which can measure up to 30 amps of current (almost 7000 watts). Have a look at the I had been using an ESP32 with its integrated ADC to monitor the DC voltage output of my MPS500 battery. tl (the the alt-energy and RV folk are even worse, saying non-sensicals like amps per day routinely). Then switch it on and see what value the CT clamp sensor reports. Heck, its the standard way of measuring line currents in utility systems, all the way from gigawatt long-haul lines down to the newfangled smartmeter on the side of your house. current ( Optional ): Use the current value of the sensor in amperes. In his case, he used a YHDC SCT-013-030 sensor that can measure up to 30 amps and costs about $12 USD. lambda: return 240 * id(current_sensor).state; just does not seem to be multiplying the current x 240 with current steady as just over 2A I get a number of around 127 - not 480? [08:19:01][D][ct_clamp:051]: My Current Sensor - Raw Value: 0.00A The ina219 sensor platform allows you to use your INA219 High Side DC Current Sensor That would be a indication that you only measure the apparent power and not the active power that you are pay for. A new version has been release since you last visited this page: 2023.3.0 . Its VCC pin connects to the 5 V pin of the Arduino, GND pin to GND and the OUT pin connects to the A0 pin. Higher values can increase accuracy. As soon as I was connected to the battery, I would be able to make automation to alert you to a drop in volts. It outputs a voltage between 0 and 1 volts, which makes it extremely easy to read using the ADC of your favorite microcontroller. Any ideas why is not accurate? First, you need to set up a voltage sensor source (ADC sensor, but for example also INA260 DC Current and Power Sensor. All options from :ref:`Sensor <config-sensor>`. Instructions for setting up built-in analog voltage sensors. MAX6675 K-Type Thermocouple Temperature Sensor, A new version has been release since you last visited this page: 2023.3.0 , Different ESP32-ADC behavior since 2021.11. ESPHome INA219 DC Current Sensor Instructions for setting up INA219 DC current sensors ESPHome INA226 DC current and power sensor Instructions for setting up INA226 DC current and power sensors Hello, When the voltage measured by voltmeter across the 18650 is 4.2v the wemos gets 0.868v. What am I missing? Improvements can be made by putting in a drop-in replacement for the 7805, such as the Murata and by adding a 50-60Hz Lowpass or Bandpass filter to suppress any noise in the measurements. There is a large + on the board. [08:18:13][D][sensor:092]: adc_sensor: Sending state 0.52344 V with 2 decimals of accuracy Defaults to 60s. Originally from Woodwards article in EDN in 1994, heres a more accessible Nuts & Volts article about it (pdf): http://beet.the-eye.eu/public/Books/Electronic%20Archive/BuildADigitalWattAndWatt-hourMeter.pdf that also goes through the theory very nicely. Id love to be less reliant on the Raspberry Pi (and its potential for corrupted SD cards, etc.) My sensor is a temp/humidity sensor and I put wemos to sleep for 5 mins then wake it up for 10 seconds and it sends out a reading by MQTT then goes back to sleep. For example, on the ESP8266, you can measure the value of an analog pin (A0 on ESP8266) or VCC (see above) but NOT both simultaneously. These are very cheap. This means that >24 hours is a luxury. Looking for WS2811 and similar individually addressable lights? [08:18:21][D][ct_clamp:051]: My Current Sensor - Raw Value: 0.00A ESPHome. update_interval (Optional, Time): The interval More than sufficient for my small apartment. ZMCT103C is a 5A Range AC Current Transformer Sensor Module For Arduino. If a sensor fits into more than one category, it will be listed multiple times. ESPHome will use this to The inexpensive Chinese CTs have a shunt system consisting of two Zener diodes in place to prevent this situation from arising. ESPHome. For energy tracking I thought I might be able to get power and feed that into the Integration - Riemann sum integral. Unfortunately it is the same as before. See ESP32 Attenuation. The outputs for the shield is 3V or possibly 3.3v and 5v, which is regulated. Among other problems, the sensors needs 5V while ESPs only like around 3V and the ASC712 output delivers 0V - 5V, with 2.5V at 0 Amps flowing. If you cant use the right units for energy and power, you shouldnt be writing educational articles on the internet, Actually Watts per hour is a unit. Defaults to 32V (the max). Defaults to 32V (the max). This is a current limiting resistor. For example in the configuration below Even though the measurements are calibrated, the range limits are variable among chips due to differences in the internal voltage reference. Note: If youre using a SCT013 CT that does not output a voltage, but rather outputs a current, you will need the R1 burden resistor shown in your circuit. 1,643 Volts between GND and A0 (with a voltage divider with 10k resistors). I have connected an INA219 breakout board to a D1 Mini so that the INA219 is measuring only the 5v current into the D1 Mini. You have to tie the back of the battery shield to ground so all grounds are at same level. Doesnt the rms voltage and current only allow you to get the apparent (kVa) power? get correct values: On the ESP32 the voltage measured with the ADC caps out at ~1.1V by default as the sensing range (attenuation of the ADC) is set to 0db by default. (It also doesnt depend on the whims of far-away computers to deliver your data to you either but, well, that thats just, like, my opinion, man. If a sensor fits into more than one category, it will be listed multiple times. voltage (Optional): Use the voltage value of the sensor in volts. Have you been able to charge the battery in the shield? Operating environment/Installation (Hass.io/Docker/pip/etc. Does wemos run ok with the 3v connection to the battery shield 3v? The communication with this integration is done over a UART bus . 330-ohm resistor is connected in series with the 2.5 volts led. required to be set up in your configuration for this sensor to work. J. M. Hopkins has added a new log for Eurorack Mute Sequencer. All options from Sensor. update_interval (Optional, Time): The interval to check the sensor. (Comment Policy). I recently completed a similar project, but used an ESP8266 and an external ADC for added resolution. I also had trouble getting the ESPHome CT sensor to work. Still they are the gold standard. The supported models are: PZEM-003, PZEM-014, PZEM-016 and PZEM-017. To test if the sensor is working, upload the AnalogReadSerial sketch (File > Examples > Basics) to your Arduino. Ive a similar project on the way for a solar power / grid setup. The change is rather high that when you use a higher power device that it has a better power factor. Of course, if you could train it by real power at load vs real whole house power for an extended period of time, itd probably get pretty good. I know I rarely put my Kill A Watt in the price mode, but use at both my place and friends places to see what the big loads are. [08:18:11][D][ct_clamp:051]: My Current Sensor - Raw Value: 0.00A Looking for a sensor that outputs its values as an analog voltage? 3.5mm Jack for CT. Also the schematic and Demo firmware is available on Github, search formottramlabs. ESPHome will use this to configure the sensor optimally. Defaults to 200ms which would be 10 whole cycles on a 50Hz system. max_current ( Optional, float): The maximum current you are expecting. And to measure power every 30 seconds is also pointless. Learning how to put an ESPHome node to sleep to save power was one of many steps I had to retrace, but I'm finally ready to pick up where I left off with an INA219 DC voltage and current sensor breakout board. Are you willing to share any details of how you set this up? Im building a 12-channel power meter, using current transformers, in a DIN rail mountable enclosure. But as I mentioned above, I only use the magnet sensor connection. Misunderstanding the units hardly implies misunderstanding anything else. There needs to be a browser plugin to automatically block any video or post that uses the phrase watts per hour. A new version has been release since you last visited this page: 2023.3.0 . The :ref:`IC Bus <i2c>` is required to be set up in your configuration for this sensor to work. My solar panel connects to the usb port on the battery shield. The ADC in the ESP32 has a range of 0 to 1.1v. I was actually able to get good readings using an ESPHome custom component, as I mentioned in the issue description. Woodward has an Interesting circuit. It doesnt matter if I turn my light bulb (60W/ 0.240A on 230V) on or off. Defaults to 0db. Core Air Quality Analogue Bluetooth Low Energy (BLE) Digital Signals Distance Electricity Environmental Light Magnetic Miscellaneous Ive made the pic simpler. The ina3221 sensor platform allows you to use your INA3221 3-Channel DC Current Sensor ( datasheet , switchdoc) sensors with ESPHome. It is possible to get the old uncalibrated measurements with a filter multiplier: Note we dont recommend this method as it will change between chips, and newer ESP32 modules have different ranges (i.e. Step 1: Connect Grove - 5A DC/AC Current Sensor (ACS70331) to port A0 of the Grove - Base Shield Step 2: Connect the positive and negative poles of the circuit to be tested to the corresponding positive and negative poles of the screw terminal Step 3: Plug Grove - Base Shield into Seeeduino Step 4: Connect Seeeduino to PC via a USB cable First, you need to set up a voltage sensor source ( ADC sensor, but for example also ADS1115) and pass it to the CT clamp sensor with the sensor option. The A0 pin on the Wemos can only measure voltage up to 1V (higher voltage will damage it). In our tests, the usable ADC range was from ~0.075V to ~3.12V (with the attenuation: auto setting), and anything outside that range capped out at either end. The INA219 is a current and voltage sensor that you use with any Arduino, ESP8266 or ESP32 microcontroller. the same UART bus. Without the burden resistor, or if it fails, now you have thousands of volts on your dinky little wires Best case scenario your micro is probably going to cook. It may be dangerous to back charge through them. Its not the fault of the transformer that you find them not accurate. - platform: template name: "Power DB" lambda: return 240 * id (current_sensor).state; I am trying to multiply the current by 240 (Vac) but the answer I get isnt right, I mean in HA I can see a current . update_interval (Optional, Time): The interval to check the sensor. I have set up the following circuit on a breadboard to get some test results: If youre using a SCT013-030, it should have an internal burden resistor, which I believe would make R1 unnecessary, IIRC. documentation for others to copy. contributing guide. 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