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Bastelfix vor 1 Tag
Hy Joost! I found the problem. The reference voltage was not ok. I reworked the PCB File to have a 50 Ohm stripline at the input and via shielding arround the stripline. I tuned the PCB for quick manufacturing on a pcb milling machine. Now the circuit works really fine! At the end of the band @10GHz you can see a nonlinearity but these are influenced by the components you used. The FR4 material is not really good at these frequencies. i would also like to exchange the 47nF capacitors in the input circuit for other 0402 / 0603 high frequency types.  otherwise it works very well and is very accurate! best regards, Sven
RF Power Meter with 1MHz-10GHz bandwidth and 55dB dynamic range
Dwits vor 1 Tag
Teaser is here!!!
Cognitive Health Care Network
mwick83 vor 2 Tagen
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 2 Tagen
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 3 Tagen
This is indeed a solution for a 2 live wire situation. Thanks very much!
Mains Power Driver by MCU DC or PWM