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{{Project|Creator=EnabrinTain |Status=<onlyinclude> Development </onlyinclude> <!--LEAVE ONLYINCLUDES FOR STATUS HACK--> |Born On=13:04, 1 August 2019 (CDT) <!--DO NOT EDIT --> |Last Updated={{#time: H:i, d F Y| {{REVISIONTIMESTAMP}} }} (CDT) <!--DO NOT EDIT --> }} ==Overview== I'm hanging info on how to use the [https://usa.banggood.com/DC-5V-WCS1800-Hall-Current-Detection-Sensor-Module-35A-Precise-With-Overcurrent-Protection-p-1224356.html WCS1800 Current Sensor Module] with an D1 Mini here. ==Hall Sensors vs Current Transformers and commentary== Hall Sensors use a generated magnetic field to detect variances when conductive objects break the field lines. They can also be used to detect DC and AC current, where a Current Transformer can only be used to detect AC. ([https://electronics.stackexchange.com/questions/100056/hall-effect-vs-current-transformers-as-current-sensors link]) I decided to use this module instead of a Current Transformer (CT) because the D1 Mini only has one available analog pin, and I wanted to attach three sensors to a single module. # Main Shop Lights # Big Fan # Office Air Conditioner (using the analog pin, as well as a digital pin) ==More about the '''WCS1800 Hall Effect Base Linear Current Sensor'''== * The WCS1800 Module has a separate digital output pin that can be tuned to go LOW when a current threshold is detected, based on a trim pot on the board. * This will give me simple "on/off" info for the two appliances that dont vary in their power use. * Hall sensors require active power, the WCS1800 can use anything from 3V to 14V, and had an operating current of 3mA. * The datasheet I found tells me that it returns 60mV/A detected for an AC range of RMS 25A at 5V input (DC range was 35A). Since I'm going to be driving it at the D1 Mini's 3v3, I need to confirm that, and expect it to be different. ** The graph showed values up to ±60A, but the curve started deviating from the simple linear after the above ranges were passed. ** It did include a graph showing a mapping of Vout for Vcc of 3v3: *** the curve was fit to the linear range of Vout = 0.0503*Ia + 1.6456, where Ia is the amperage being detected. *** This will not be as accurate past ~20A however, for example I'd guess that while the formula would give a result of 32A if the Vout is 3.3V, the sensor would actually likely to be reading a current 50A or greater. *** These values cycle at 60Hz, so it behooves us to sample our values at a high enough frequency to be able to find the peaks, and calculate the RMS of the current draw. There's a very good writeup about doing this in CT sensors ([https://learn.openenergymonitor.org/electricity-monitoring/ct-sensors/interface-with-arduino here]). The logic for the WCS1800 will work in a similar way. ==D1 Mini (ESP8266)== * I soldered wires for the Ground and 3V3 pins to power all the modules from a small piece of proto board. I'll be encasing it in Jeffweld for safety. * The first WCS1800 module's AOUT and DOUT pins are attached to the D1 Mini's A0 and D0 pins respectively. * The other two modules' DOUT pins will be soldered to the D1 Mini's D1 and D2 pins, but I haven't done it yet. * I think the AC 60Hz cycle applies to digital outputs as well. This means some debouncing logic is necessary, even though we aren't reading voltages for current values. ** I'm not 100% sure about that claim, however tests showed that the D1 Mini D0 pin was rapidly switching from high to low. ==Arduino Sketch (pin reading, and MQTT publishing)== TO DO (right now its just flipping the BUILTIN_LED when it sees a signal on D0 and printing the value of A0) ==Next Steps== * Look at the MQTT messages being sent from the light sensors to see the format that grafana wants * bump up the serial baud rate so that the loop isn't as laggy there * Verify the math for the analog signal makes sense * Add code to find peaks * Add code to debounce D0 * Add wifi connection, look for timestamp library, configure MQTT client * Add doobler config * Add Grafana graph [[Category:IOT]] <!--MAKE AS MANY CATEGORIES AS YOU NEED-->

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