I have optimized the design of the RS485 piggyback for the Sunny Boy inverter. An isolated RS485 driver with integrated DC/DC converter is used and replace the external expensive 5V DC/DC converter of the first version.
If there are some people interested in an assembled PCB than I can order a batch of PCBs and [...]
After I found out the pinout of the Sunny Boy 2100TL inverter I build the UART piggyback and it is working fine. Now, it’s time to build the RS485 version.
Because I didn’t want to use an external power supply for the galvanic isolated output side I used an (expensive) [...]
Last month I did buy a 2kW photovoltaic system for my house. To connect the pv panels to the grid I bought the Sunny Boy 2100TL inverter from SMA. Unfortunately, it comes without any communication interface in standard configuration. The price for the so called RS485 piggyback interface card is around 90 Euros. On sales [...]
I needed an adapter for connecting the new A3979 stepper motor driver to the parallel interface of my PC. I like to use EMC 2. The adapter can be powered from the same power supply as the stepper motor drivers. It has an onboard DC/DC converter, generating 5V for [...]
For my new CNC project I was looking for a cheap microstep driver which should be able to drive 2A stepper motors. I ordered three samples of the A3979 micro-stepping driver some month ago from www.allegromicro.com. Now I had some time to design a small board for the driver A3979 and an