Looks like the GSM module will be added to the Ethernet Module. Found several modules in price from 1.27 to 4 USD. Basically UART operated with support of GSM + GPRS, TCP/IP, UDP/IP, SMS etc. The cheapest kit is data only, but some of the others include voice as well. More important is that datasheets…
The block diagram above show the Ethernet module. Starting with a dual RS-X to the backbone and a SPI based W5500 for Ethernet connectivity. In addition we add a ESP-12 for Wifi, SPI Flash for storage and a RTC battery & oscillator as well as the mandatory SWD connector. I hope to have a 3D…
A Modular PLC system will have some size & cost, and as a home central should be small, easy to hide and low cost it might be wise to produce a specialized “All In One” solution. The diagram above illustrate the content with “backbone” replaced by a MCU. The C firmware will basically only be…
Using STM32F405RG on everything is an overkill, but I can always consider dropping down to STM32F105RB/C later. This M4 gives us a powerfully MCU on each module capable of truly distributed processing as we are promoting in Plain. Ethernet Module is what I have started on now. This will host a STM32F405RG, 2 RS-485’s for…
I am toying with using my 3D printer to (1) print a module box and (2) to print PCB holders as illustrated above. This was an early draft – the idea is that you push the module in and use a screwdriver to mount it – I need to look for low cost alternatives here…
My previous backbone board had to little space between connectors + no connection for PSU & communication – this one has 10mm between connectors which is more realistic – thought I still expect one Add-On board to use ca 20mm width. The total width “as is” is 100mm, so it is still very small. I…
This came as a surprise to me – it is only 1,5 years ago I started doing SMD electronics. My previous experience had only been hole through technology. But, as hole through have so many limitations I decided to jump in and give it a try – the first component I tried was a LQFP48…
The good thing about a blog is that it is excellent for notes – if I make my work-notes here they are called “documentation” 🙂 The following are programming notes for the PSU Control Board: PA10 – GPIO J1-4 Relay 1 – Connect extra 12V – 36V If Relay 2 is On. PA9 – GPIO…
This pic shows my analogue regulator. You can see the 2 transistors and a fan in the back and my DIY load array on top left. I am actually quite happy with this after I mounted it on a proper PSU source in. The only things left is to get the current regulator working, but…
I purchased this Lab PSU 0-30V /5A from ZHAOXIN a few years back, but I have not really been using it much. What I discovered as I started using it was very dissapointing. This Lab PSY from ZHAOXIN is far from cheap – it usually cost 80ich USD + 50ich P&P as well as ca…