Thanx for the schematics, I'll have a look at. Can you control led light bulbs with this schematics?

Also the time of Atmega328 has passed, I guess. They are marked "Not recommended for new designs" by the manufacturer and I have struggled to fit everything I wanted (UI mostly) in it's memory. I ended up disabling serial output in mysensors and everywhere else, decreasing message buffer size and scraping bytes everywhere else I could to make it work stable without crashing.
I'm not sure if I will continue to make new designs for mysensors, but I think I will use NRF51822, as they are so cheap now at aliexpress, and you can add PA LNA to help with signal strength (theoretically, I haven't tried it). Another way is to use NRF52840 for all new designs, even they are 4-5 times more expensive than 51822 but later you can write a firmware for it to use Zigbee of Thread/Matter and use the same design with new functionality.

• Home Assistant server with built-in NRF24 radio and OLED display based on Orange Pi Zero
• MQTT Mysensors gateway with ESP8285
• 4 channel triac dimmer with oled display and UI for operating in standalone mode.

PCB antennae work better at > 868MHz(pg 7). A 2.4GHz signal should have an antenna length of 3.1cm The nRFl01 spec shows a PCB with an antenna that is about that length but I measure the board I have and the antenna is about 4.6cm(?) Here(pg 10) you'll find a design, though I'm not sure for what frequency as the length adds up to 4.03cm. As you can see, you must not have the ground plane near the antenna.

Here, RonM9 modifies an nRF24l01 making the antenna a dipole. I tried this and did show some improvement, but not the success he had. His wires were ~5.0cm, but bends them in the opposite directions at the edge of the pcb. Does that make the antenna length about 4cm?

The antenna for a longer wave length (lower frequency) will be proportionally longer.

I'd like to do the same testing as RonM9, but I've got some other pressing projects. ;)

I hope this helps your research.

OSD

@NeverDie It is my understanding, though I can't wrap my head around it, that it is the length of the conductor that makes the antenna tuned to a certain frequency. If this is the case, you could run your antenna around the edge of your circular pcb which would make the effective radius only slightly bigger.

You mean like this?

I get the impression that somehow the antenna positioning relative to the ground plane might figure into it as well:

Perhaps that stands in the way of wrapping the antenna completely around the circumference? I can't claim to have any deep understanding of how antennas are supposed to be designed. In the past I noticed that TI sold a sample set of canonical antenna designs, so then you could try them all out and see what suits you: https://www.ti.com/lit/an/swra161b/swra161b.pdf?ts=1661617962454&ref_url=https%253A%252F%252Fwww.google.com%252F

I have the antenna hanging out over the edge, as per Nordic Semiconductor recommendations, so that it doesn't hover over the ground plane. However, that makes the overall footprint a bit larger, somewhat defeating the point of powering it with a CR2032. I may try making a smaller version where the antenna doesn't overhang just to see how much difference it does or doesn't make. For a device like this, I mostly care about reception rather than transmitting, so maybe for receiving such a change won't make much of a difference.

Who makes the world's smallest nRF5x module?

I moved all the gateways and controller part in a most suitable location

I've created a dual current sensor for the fuse box and the inverter. Each Current sensors can withstand 90A max, so I used both channels in parallel. The sensors are defined for both Channel 1, 2 and Sum(Ch1+Ch2) to handle this case easily

Recently I made an updated version of my Photovoltaic monitor since the 20A that the old one could withstand are not enough now, so the new version is capable of 50A max. Still waiting the Hall sensors though...

Finally, I cleaned up a bit the deployment under the bench
but I am not done yet

Ebyte NRF52805 module

Hi, I see you integrated the E104-BT5005A BLE chip in this project.
I’m trying to use it in a simple robot project and having difficulties to make the RX/TX connection with “RF Connect” IOS app.
I already wired the chip to the Seeeduino board and I can find and connect the bluetooth on the RF scan list. But I just don’t know the Arduino code to make it send and receive simple massages on the Arduino serial monitor.

Your help is very much appreciated.

Amit

Maybe the admins should consider having a separate section for this !!>?

the power supply system under the dinette seat

the battery management system (purchased) data are read via wifi by an ESP32, which reports the info to the GW via nRF24L01+.

a closed look at 2 sensors.
the one on the left reads voltage and current from the solar PV panel and to the battery management system

the one on the right reads voltage and current from/to the start and service batteriers
both sensors report instant power and energy.

Fresh water sensor reads the water level, flow and temperature.
has 4 optcoupled outputs to send the information to the 4 LEDs of the original control panel of the camper

gray water tank sensor reports water level with an ultrasound sensor. has an optocoupled output to the "full" LED of the original control panel

bettry supplied temperature and humidity sensor.
I use it in the fridge but also at home, where I have also one with BME280.

A fan controller to help the fridge to work better, controlling the condenser temperature using an optical thermometer sensor.
I have 3 other units, one in the power supply system, one in the closet and one on the roof.
They are all with a PID controller.

20210612_201851[1].jpg

https://github.com/smartboxchannel/EFEKTA-EINK213-AIR-QUALITY-SENSOR-NRF52840-V2-ED3

It's actually at this link posted earlier in the thread: What did you build today (Pictures) ?:
I mostly use it with BME280 modules for temperature and humidity, but I have tried some other I2C modules in it.
I'm still experimenting with the motion detector. That will probably get it's own board at some point. It doesn't really fit the enclosure I designed this board for.