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Sonoff POW - Measurement at Off state #1420
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I thought that the always on option would provide almost the same functionality... |
In my opinion “Always On“ is not an alternative solution. Let me show you, how I am using the modified Sonoff. In an environment where real switches should work independent from home automation, this solution can help. Imagine, you have a corridor with 3 regular switches, to turn on/off the light from different positions. Without home automation you have to use an impuls switch (ELTAKO). If you want to add home automation, but won’t loose the given functionality, the modified Sonoff POW is a good choice. With this solution you have the same functionality, even if your home automation system is not working. This is only 1 application. You can use the modified Sonoff POW also as a Master/Slave switch. This means that you can switch the relay depending on the amount of payload (for example: switch on a vent if power is greater than 100 Watt). Or for power savings (for example: switch off the Active Subwoofer if power is less than 20 Watt). The advantage of a modified Sonoff POW is that the switching capability remains the same. |
Convinced. |
My use cases:
With this hack (thanks @Kniri) in every case I can do it with only one POW :-) |
5.11.1i * Fix some Energy Monitoring related issues * Add command SetOption21 1 to allow Energy Monitoring when power is off on Sonoff Pow and Sonoff S31 (#1420)
There will be an option SetOption21 1 to always allow energy monitoring in version 5.11.1i |
5.12.0 20180209 * Change library PubSubClient.h define MQTT_MAX_PACKET_SIZE from 512 to 1000 for Home Assistant support * Change relation of define MESSZ being dependent on PubSubClient.h define MQTT_MAX_PACKET_SIZE * Change command color parameter input checks to less strict for Home Assistant support * Change command Ina219Mode into command Sensor13 * Change commands HlwPCal, HlwUCal and HlwICal to PowerCal, VoltageCal and CurrentCal to be used for both Pow and S31 calibration * Change commands HlwPSet, HlwUSet and HlwISet to PowerSet, VoltageSet and CurrentSet to be used for both Pow and S31 calibration * Change uptime from hour to second resulting in a display of 123T13:45:21 where 123 is days * Change module name Wemos D1 mini into Generic (#1220) * Change HTML from width=100% to style=width:100% supporting HTML5 (#1358) * Change OSWATCH_RESET_TIME (Blocked loop) from 30 to 120 seconds to allow slow networks (#1556) * Change WIFI_MANAGER_SEC into WIFI_CONFIG_SEC (#1616) * Change function pointers code to save code space and memory (#1683) * Change webserver argument processing gaining 5k code space (#1705) * Change weblog memory usage (#1730, #1793, #1819) * Update TasmotaSerial library to 1.1.0 * Update language files Italian (#1594), Dutch (#1723) and Spanish (#1722) * Fix Non-English JSON temperature unit attachement * Fix Arilux RF induced exception by moving interrupt handler to iram on non ESP8266/Arduino lib v2.3.0 * Fix truncated command names and wrong response for DomoticzSwitchIdx (#1571) * Fix %-sign issue as printf escape character in Humidity and Sonoff SC (#1579) * Fix DS18B20 temperature JSON decimal dot (#1561) * Fix Energy JSON message (#1621) * Fix IRSend parameter translation (#1636) * Fix TSL2561 device detection (#1644, #1825) * Fix BME680 teleperiod resistance measuring (#1647) * Fix Energy Monitoring Energy Today and Energy Total reading after restart (#1648) * Fix IRReceive Data value (#1663) * Fix Energy Monitoring Energy Period roll-over (#1688) * Fix compiler warnings (#1774) * Fix command PWM response if no PWM channel is configured (#1783) * Add locale Decimal Separator to Web sensor page * Add ColorTemperature to light status message * Add command PowerOnState option 5 which inverts PulseTime and allows for delayed always on after power on * Add OtaMagic two step Web server OTA upgrade using filename-minimal image if OTA free space is too small * Add support for PMS5003 and PMS7003 particle concentration sensor * Add command SetOption21 1 to allow Energy Monitoring when power is off on Sonoff Pow and Sonoff S31 (#1420) * Add Chinese language file (#1551) * Add French language file (#1561) * Add Spanish language file (#1589) * Add HTTP Allow Cross Origin removed from ESP8266/Arduino lib v2.4.0 (#1572) * Add Home Assistant MQTT Discovery for switch and light to be enabled by command SetOption19 1 (#1534) or define HOME_ASSISTANT_DISCOVERY_ENABLE in user_config.h (#1685) * Add command State to retrieve device state information (same data as teleperiod state and status 11 in slightly different JSON format) * Add optional login to Webserver AP mode (#1587, #1635) * Add command Sensor15 2 to start MHZ19(B) Zero Point Calibration (#1643) * Add support for Sonoff S31 Smart Socket with Power Consumption Detection (#1626) * Add command SetOption20 to allow update of Dimmer/Color/Ct without turning power on (#1719, #1741) * Add NTP sync time slot based on chip id (#1773) * Add cursor pointer to web button (#1836)
This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions. |
5.11.1i * Fix some Energy Monitoring related issues * Add command SetOption21 1 to allow Energy Monitoring when power is off on Sonoff Pow and Sonoff S31 (arendst#1420)
A standard Sonoff POW is unable to measure the electrical power, when the relay is Off. If the measurement would work independent of the relay state, the Sonoff POW could be used as a simple master/slave switch, for example.
I would like to share my modification of a Sonoff POW. The objective was the ability to measure the power independent of the relay state. Fortunately the Sonoff got 2 electrical connectors which are not used by the Sonoff. They are marked with the letter „E“ and are intended to connect the protected earth of input and output. The Sonoff doesn’t use protective earth internally, so the connection could be made outside of the Sonoff. The “E“ connectors could be used for different purposes. I have used that connectors to lead the other relay contact out of the device (see the black wire on the left side of the photo). This connection makes power measurement possible, independent of the relay’s state.
For good documentation I’ve scratched off the black colour of the letter „E“ and modified it to „L“. Additionally I’ve labeled the output connectors “Switched“ and “Non Switched“ with a little sticker. That’s all on the hardware side.
The software needs a little modification, because the power will not be shown if the relay is in the OFF state.
I made two changes in the module “xsns_03_hlw8012.ino“
At Line 238: if (hlw_cf_pulse_length /* && (power &1) */ && !hlw_load_off) {
At Line 243: if (hlw_cf1_voltage_pulse_length /* && (power &1) */) {
@theo: It would be great, if you could take this into consideration in future versions of your code. Maybe you have an idea to make it configurable.
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