As mentioned before I am a big fan of STM32F105RB as the smallest MCU that I use unless package size is an issue. I have other preferences for LQFP48 and TSSOP20. What puzle me is a comparison between STM32F103RB and STM32F105RB on functionality and prices from AliExpress. I suspect that the reason for the low price on…
RS-X is easyIPC over RS485 using a special 4-wire cable and a timing protocol. Several modules are designed to be connected to a RS-X network as well as a series of infrastructure components needed to build an automation/robotic network based on easyIPC. easyIPC is about providing a plug & play network with open, secure communication…
This board uses a LQFP48 because I needed more pins and it extended the size to 50 x 15 mm to get everything in. It contains 2 x Stepper Motor Drivers and 2 x end point connections. This can operate 2 x 5-wire or 4-wire stepper motors. I have not decided on MCU yet. I…
I have a bunch of these that has been laying around for ages with the DIP version drivers of ULN2003, but I have never tested them. So I connected a STM32F030F4 dev board to the ULN2003 driver and tested a 4 step and 8 step algorithm. I have used quite a lot of steppers and servo’s…
Just fancied making a micro 4 x Servo controller. Each of the connectors can be used for Servo, RC Motor, Digital In/Out or Analogue in.
As mentioned in a previous post I could extend this to 8x DC motors. I realized that the screw terminals I used had a smaller 2.54 pitch version. Connecting 8xL9110 to drive 8 DC motors or 4 Stepper motors are easy and straight forward. This is a draft as I was keen on looking at…
I am quite found of these small boards so I reuse the MCU and RS485 interface on various designs. This one uses a ULN2003 to provide 7 PWM ports with up to 16V and 0,5A each. I use a 8 pin 1.27pitch connector. the 8th pin is V+, while the second row is all GND.…
As you deploy RS485 (or CAN) on larger distances you will need to increase cable quality and lower baudrate. For 15 meter I don’t fuzz, I just twist a pair of cables and hook them up. A good advice is to have standard colours for A+ and B-. For better cable quality you can use…
This is a simple, passive switch anyone can wire on a vero-board. It just connect 8 ports in parrallell. “GBA+” is easy to remember and means Ground, B(-), A(+) and Power. You use one port as input and 7 as output in a classic star network. The only thing you need in addition are 120…
The Software on the Mini Sensor Module is outlined above. I need to wrap up a tight RS-X protocol as illustrated earlier. I also need a RTOS ported as well as sensor Logic for each sensor. DHL11 (or 22) uses a bit-bang protocol. We will use an interrupt on this pin with some timing for…