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en:tech:powermeter [2021/01/21 11:24] – bullaren:tech:powermeter [2022/11/07 16:15] (current) – [Programming (ESPHome)] bullar
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 The first task is to investigate into the S0 interface and then make it available for evaluation in our home WiFi. Let's take a look at the S0 signal, which comes from a three-phase meter: The first task is to investigate into the S0 interface and then make it available for evaluation in our home WiFi. Let's take a look at the S0 signal, which comes from a three-phase meter:
  
-{{: tech: s0_signal.png? direct & 400 |}}+{{ :tech:s0_signal.png?direct&400 |}}
  
 There are pulses of approx. 44ms and the interval between the pulses reflects the current consumption. In the example it is 19.25 seconds. According to the device specification, we can expect 1000imp / KWh. This is also noted on the front of the meter. This results in the calculation formula for the consumption of: There are pulses of approx. 44ms and the interval between the pulses reflects the current consumption. In the example it is 19.25 seconds. According to the device specification, we can expect 1000imp / KWh. This is also noted on the front of the meter. This results in the calculation formula for the consumption of:
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 If you want to use WiFi with your own projects, it is always advisable to first take a look at the ESP8266 modules. If you want to use WiFi with your own projects, it is always advisable to first take a look at the ESP8266 modules.
  
-{{:tech:esp07.jpg? nolink & 200 | ESP-07}}+{{ :tech:esp07.jpg? nolink & 200 | ESP-07}}
  
 One of the simplest approaches is an ESP-07 with the open source firmware [[https://www.letscontrolit.com/wiki/index.php/ESPEasy|ESP Easy]]. In fact, we can manage to implement the above task without our own programming. \\ One of the simplest approaches is an ESP-07 with the open source firmware [[https://www.letscontrolit.com/wiki/index.php/ESPEasy|ESP Easy]]. In fact, we can manage to implement the above task without our own programming. \\
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 {{ :tech:powermeter_3d_print.jpeg?direct&200 |}} {{ :tech:powermeter_3d_print.jpeg?direct&200 |}}
  
-===== Programmierung =====+===== Programming (ESPEasy)===== 
 + 
 +After the hardware has been created, we still have to program the ESP module. As already mentioned, the PowerMeter is based on [[https://www.letscontrolit.com/wiki/index.php/ESPEasy|ESPEasy]]. In the link you can also find instructions on how the ESPEasy firmware is installed on the module. In order to get into the programming mode, the jumper SJ1 must be closed during the reset release. The programming is done serially via JP1 (USB-serial converter). 
 + 
 +If everything went well and the module is integrated in the home WiFi, all further settings can be made via the web interface. For this we need: 
 +   * Controller setup 
 +     * HTTP 
 +     * MQTT 
 +   * Hardware setup 
 +   * Device setup 
 +   * Rules Setup 
 + 
 +==== Controler Setup ==== 
 + 
 +In my case, I send the data to my [[https://www.volkszaehler.org | Volkszähler]] for recording and evaluation. This is done as JSON format over HTTP. That's why I need an HTTP controller. \\ 
 +In order to display the current consumption value on a panel (I use [[https://www.home-assistant.io | Home Assistant]]), for example, the value can also be transferred via MQTT. This is what the MQTT controller is for. 
 + 
 +=== HTTP === 
 + 
 +The gray areas are the anonymization of the host and the UUID of the //Volkszähler//. Then simply enter your own values there. Of course you can also send any other format. You get the value with ''% val3% ''. The complete line at Publish looks like this for me: 
 + 
 +'' middleware.php/data/<uuid>.json?operation=add&value=%val3%'' 
 + 
 +{{ :tech:powermeter_esp_http.png? direct & 200 |}} 
 + 
 +=== MQTT === 
 + 
 +Now we select MQTT and enter the relevant data. This includes the IP address of the MQTT server and the account data for logging in. The result should look similar to the following example. Here only the IP of the own MQTT server is anonymized and must be adapted accordingly. 
 + 
 +{{ :tech:powermeter_esp_mqtt.png?direct&200 |}} 
 + 
 +==== Hardware Setup ==== 
 + 
 +On this tab we only have to switch on the pull-ups at the inputs used. 
 + 
 +{{ :tech:powermeter_esp_hardware.png?direct&400 |}} 
 + 
 +==== Device Setup ==== 
 + 
 +Next we need a device that measures and stores the time between pulses. This can be achieved via the Devices tab. A separate device is required for each S0 input. Here is just one input shown in my solution. 
 + 
 +{{ :tech:powermeter_esp_devices.png?direct&200 | Device Setup}} 
 + 
 +Incidentally, the green numbers on the right indicate the current measured values. In the example, the time is 25991ms, which corresponds to a consumption of 138.5 watts. 
 +Here are the settings for the pulse counter: 
 + 
 +{{ :tech:powermeter_esp_pulsecounter.png?direct&200 | Pulse Counter}} 
 + 
 +Now we have a connection to the MQTT server and we can determine the consumption. What is missing is the flow control for MQTT. There are rules for this within ESPEasy: To do this, copy the following code into rules set 1. 
 + 
 +<code> 
 +On S0Pulse#Time do 
 +  publish /home-assistant/%sysname%/powerflat,[S0Pulse#Time]    
 +endon 
 +</code> 
 + 
 +The calculated result is sent to the MQTT server at each completed measurement interval. 
 + 
 +===== Programming (ESPHome)===== 
 +The PowerMeter can also easily be integrated with help of [[https://esphome.io|ESPHome]] into [[https://www.home-assistant.io|Home Assistant]]. The sample code for one phase you will find here: 
 + 
 +<code yaml> 
 +esphome: 
 +  name: powermeter 
 + 
 +esp8266: 
 +  board: esp01_1m 
 + 
 +# Enable logging 
 +logger: 
 + 
 +# Enable Home Assistant API 
 +api: 
 +  encryption: 
 +    key: "---key---" 
 + 
 +ota: 
 +  password: "---password---" 
 + 
 +wifi: 
 +  ssid: !secret wifi_ssid 
 +  password: !secret wifi_password 
 + 
 +  # Enable fallback hotspot (captive portal) in case wifi connection fails 
 +  ap: 
 +    ssid: "Powermeter Fallback Hotspot" 
 +    password: "--password--" 
 + 
 +captive_portal: 
 + 
 +time: 
 +  - platform: sntp 
 +    id: my_time 
 + 
 +sensor: 
 +  - platform: pulse_counter 
 +    pin:  
 +      number: GPIO14 
 +      inverted: true 
 +      mode: 
 +        input: true 
 +        pullup: true 
 +    unit_of_measurement: 'kW' 
 +    name: 'Power Meter Flat' 
 +    id: powermeter_flat 
 +    internal_filter: 10us 
 +    filters: 
 +      - multiply: 0.06  # (60s/1000 pulses per kWh) 
 + 
 +  - platform: total_daily_energy 
 +    name: "Total Daily Energy" 
 +    power_id: powermeter_flat 
 +</code> 
 + 
 +Instead of measuring the time between two pulses the number of pulse per time interval is counted.  
 + 
 + 
 +===== Conclusion ===== 
 + 
 +The PowerMeter is running more than a year now without any problems and is transmitting the data. A typical consumption curve looks like this (screen shot from my own [[https://www.volkszaehler.org|//Volkszähler//]]): 
 + 
 +{{ :tech:verbrauch.png?direct&600 |}} 
 + 
 +The peaks include the oven, stove and kettle. The regular pulses come from the fridge/freezer equipment. My base load is 150 watts and is certainly also due to the automation. 
 + 
 + 
 +===== Downloads ===== 
 + 
 +  * {{:tech:powermeter_schematic.pdf| Schaltplan (,pdf)}} 
 +  * {{:tech:powermeter_bom.csv.zip| Bestückungsliste (BOM) als .csv}} 
 +  * {{:tech:powermeter.brd.zip| PCB Eagle File (.brd)}} 
 +  * {{:tech:powermeter_v2.stl.zip| Gehäuse (.stl)}} 
 + 
 + 
 +===== Donate ===== 
 + 
 +If you like my articles feel to donate a cappuccino or so... 
 + 
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 + 
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en/tech/powermeter.1611228252.txt.gz · Last modified: 2021/01/21 11:24 by bullar

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