This new Connectivity Module have 8 x RS485 connectors. I use the front for the antenna and USB, while top/bottom for connectors that most likely will be permanently wired. Some users would probably request both 4-wire RS422 and RS232 and I will make a board for those later. I also need a CAN board. As…
One of the challenges I have is the size of connectors in front of the modules. I am actually considering using Top and Bottom on the modules to increase connector space. Another issue is that the screw connectors used on the RS485 board below is not really operational from front alone. Looking at the…
This is a classic RS485 circuit that I realize is not that good. It works fine, but it requires that ground always is included because of the 12V diodes. This simplified circuit is in many ways better as we actually can use a twisted pair only. This shows a none-isolated RS-X port. I also drag…
This draft will give me 6 (8) RS-X ports. 6 if I use the backbone and 8 if I use this stand-alone. In addition Ethernet, Wifi and Bluetooth as well as USB. RS-X Port is 4 pins with 12V and RS485 differential signalling. Basically it feeds 12V Power to the RS-X devices. I like playing…
I drafted a GSM/Ethernet module as well as a 3xGalvanic RS485 earlier, but I am toying with the idea of attempting a PLC Module with STM32F405 using ESP32 for Ethernet/Wifi and 4-6 RS-X ports. 4 if used as PLC-module, 6 if used stand-alone. I have also 2 CAN ports if I can find space/pins for…
I need a few C/C++ components to implement the Plain VM, one of them is a RTOS . I wrote my own RTOS that runs on both Arduino, ESP32, STM32, Windows and Linux years ago. It is a simple linear scheduler. I found it quite handy even on Windows applications as it scale better and…
One concern as I implement the VM is the parsing performance on instructions. The Data Descriptor below illustrate the challenge. It is a dynamic structure with bit fields. For every bit field I end up decoding it causing AND /ROTATE instructions. It is bit packed to save space, but decoding a bit-packed field will cost…
I have a few Raspberry PI Hat’s laying around and I wonder if I should make a ESP32 based replacement for Raspberry PI Zero W. The IO on ESP32 is far more capable than the one on the PI, but we have a few limitations and less pins to play with.This is an early draft…
This litle Servo about 3 x 3cm is far from a wimp as far at current usage goes. A single Servo have no problem dragging a 10A PSU down – actually I think it’s the current regulation that is predictive, meaning it drops out because current raise is to fast – but, anyway – the…
Been a long day with try & fail. I managed to get Auto Reset working on 1.0 by connecting RST to ChipPU amd DTR to GPIO0, but it only worked some times. Walking back to my rev 1.1 I wanted to test manual loading and discovered it did not work either. Inspecting ESP32 I notice…