I need to test if I can get away with this simple circuit. The only challenge with CH340 is that it’s documentation in English is limited, so it’s a bit difficult to read up on all the pin options. But, I have seen others attempting this so will give it a try. This is CH340…
Updated the W5500 Ethernet schematics. C9 to C15 present a challenge in PCB routing since I am using 0805 packages. They are supposed to be attached close to each AVDD pin which is a challenge. Also I added the L1 ferrite bead to stop 100Mhz signals from crossing over. But, I am still thinking that…
STM32F303 is a M4 clocking at 72Mhz. It has strong ADC’s and build in op amps as well as 3 motor controllers on the larger chips. It is a very interesting MCU for specialised motor controllers, but have so far been priced in the 10++ USD region. Lately I noticed that CB and CC versions…
This is the breakout board version of W5500 available for 10.- USD on AliExpress. I have a few of the more expensive ones for W5200 bought from Wiznet. Using breakout’s like this simplifies the prototyping if you assemble by hand. I also notice that Wiznet support examples for STM32F103 using CoIDE these days. This Picture show…
This is mostly the reference schematics with minor modifications.
Ok, I underestimated the size and number of passive components around W5500. I was hoping to assemble on only one side, but I either need to increase size or assemble on both sides. This is 0805 components. I can use less space with 0603 and choosing a smaller x-tal. But, 0603 start to get difficult…
I have plenty of RS485 USB sticks that I bought for 1.- USD each. They are great, but I lack the same for CAN. And I lack low cost sticks for CAN Low Speed/Fault Tolerant. The larger com adapter is great, but I will need cheap ones I can afford to loose. In this I…
This is an early draft with only the main components mounted. The schematics are not even close to done yet. I like to place main components straight away to get a look & feel and in many cases I adapt schematics to physical layout. I know some prefer to complete schematics before they start PCB…
Connecting things to a Windows PC is sometimes a bit of a challenge. I am in urgent need of a CAN-X adapter. These things cost and if I add my request for a Wired Ethernet, Wireless Ethernet as well as USB prices start to have several digits. The amount of software needed and the component…
It’s not been much activity lately. You can blame the summer and the mess in my garden for that. I want to wire up a few experiments. One is a motor controller based on F405 and the other is a Ethernet controller based on F107. The Rx breakout board is excellent for this as it…