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mwick83 vor 8 Stunden
Hardware-wise, most of the board is tested: The switching regulators are working. The second regulator can be switched on and off on demand. The ESP is flashable and executes code. The relays can be controlled by the ESP. The battery voltage can be measured. I haven't tested the UART connections yet, but that's what I plan to to next (hardware-wise). The software is also starting to take shape: A command console via the debug/programming UART is implemented for testing purposes. The fill level sensor protocol handler is implemented, but mostly untested. WiFi connects properly to my home WLAN. I'm planning to implement a WiFi manager class to encapsulated it better. An MQTT client connects to my local broker. This will be used later for status information and alerts. A big task is to implement an MQTT manager class to handle multi-threading properly. The real time clock of the ESP is keeping the time, when the ESP is in deep sleep to preserve power. The time system is able to sync with an SNTP server. But the time can also be set via the command console. A rough plan to implement the control logic for the fixed irrigation plan is written down as comments within the IrrigationController class. The configuration of the WiFi and other services is currently hardcoded in the file include/networkConfig.h. The repository contains a template version of the file. I'm planning to change the configuration mechanism either by providing console commands or by implementing a webserver.
Irrigation Controller
mkstevo vor 16 Stunden
I have recently been able to (finally!) build myself another of the "original" Elektor 2012 published Grid Frequency Monitors. These are crystal controlled and so should be more accurate than my resonator controlled PicAxe design. Comparing my design to the original showed that one of my two meters here at home was giving nearly identical readings as the "original", the other was slightly out. Not to worry, I included a calibration facility into the software. I tried to adjust it, but the steps in the calibration were too large, after adjustment it was reading too high, or too low, never 'right'. The original calibration attempted to 'tune' the internal resonator of the PicAxe processor, in 0.1% steps which gave some large steps in the final frequency readings. I have re-written the calibration so that it adds the compensation to the value of frequency read from the (low voltage) Mains supply. This has allowed the calibration steps to be made both much smaller (each step adds or subtracts 20mHz to the readings) and the range of compensation much larger. The calibration now also allows the calibration values to continually cycle from "0" (no compensation) up to "+9" (increase the displayed frequency) around to "-9" (reduce the displayed frequency) and eventually back to "0" while the jumper is held in position rather than requiring the jumper to be removed for each step of calibration.
Electricity [Grid] Frequency Meter
DanyR vor 1 Tag
This is indeed a solution for a 2 live wire situation. Thanks very much!
Mains Power Driver by MCU DC or PWM
BreedJ vor 1 Tag
Hi Sven, Here are some things I can think of which might solve your problem.   Check if there is no short circuit between the pins of the IC since its difficult to solder. Check if there are no other SMD components shorted. Some of the components may change the linearity if they are shorted. Are you sure the power source or measurement device you checked it against is linear? I mean are you sure the -50dBm is actualy -50dBm. Do you use 50 Ohm impedence cables and connectors. If you use a scope to check the voltage, did you use a 50Ohm terminator of the 50Ohm option of your scope, Are the cables connected properly. Is the reference voltage what it should be? The IC might be damaged or bad. In the past I bought some from AliExpress. Some of these components, like the voltage reference where no good. I hope this will help. Best regards, Joost
RF Power Meter with 1MHz-10GHz bandwidth and 55dB dynamic range
Claus Wahl
Claus Wahl vor 2 Tagen
Exactly, oetelaarNG. To make it simple and either intuitive (pull the handle should be ok) or well guided.  I believe that Elektor needs to better explain what could be done to the exterior and what is not OK. Could the door have a drilled hole? Could a well integrated screen be recessed in the door or the frame? If no modification at all is allowed on the exterior, most of the suggestions are breaking the 'design rules'. It seems like a camera is out as it will have to be wisely placed? Even a voice-system will be difficult. We still have knocking and pulling the bell, but advanced use of these inputs *will* require some guiding for the visitor, eg with a note. But then, why not make a nice naming plate with some touch input and communication device? If some form of recessed mounting could be accepted: Occasional users, old folks etc should be comfortable using it: Pull the handle, activate a screen with info and touch/keys and place the call. When not in use, the overall color and appearance match the door or frame.  
Invisible Multi-Target Doorbell