Final 3D with horizontal connectors. I might add a jumper to allow separation of 5V and Stepper V+. This can in theory drive 28 PWM channels up to 50V @ 500mA each, but the ULN2003’s overheat if we tried that. I will add a proper PWM Hat later as this is dedicated for 5-wire stepper…
This board is a bit misleading because I am using the wrong connectors to mock up an early 3D. The actual connectors are right angle and a bit wider, but testing on a paper print it seems that I have just about the size I need. Below is a picture of the Stepper Motor this…
Revision 1.1 of my 8x DC Motor Hat. Basically this is 8 x DC Motors and 16 x IO/Servo, but the IO ports are 5V only. Differences from revision 1.0 are; STM32F405RG 168Mhz 32 bit ARM M4, 192Kb SRAM, 1Mb Flash. CAN bus Removed addressing. USB Separate power connector. 8 x DC Motor ports 5-12V…
Revision 1.3 of my 32xIO/Servo Hat. This export 32 of the GPIO pins using a Signal, V+, GND header common for Servo ports. V+ can be separate or use 5V from USB. This version uses the 3 edges to get all 32 IO’s available on the edge of the board. It does in addition add…
Small units to communicate over radio is not exactly new. We are well used to 2.4Ghz modules that cover both 100m and even 1km ranges. LoRa stand for Long Range and some of the units have very impressive parameters. This little fellow is 20x14mm and can communicate over 6,5km using 850-930Mhz. It’s brother E22-400M22S cover…
I moved CAN to the same place as the X Hub and will be using this from now. Added jumpers for RS485 vs UART out. The rest is as before: ESP32 RPI connector using SPI CAN port RS485/UART port USB Serial/Programming port. 5 x Sensor ports. The X Hub is a better match for Raspberry…
Routing a PCB is actually a bit of work, but I enjoy doing it a few hours early morning and late evening. It is easy to pick up and then just leave, and over 1-2 weeks I usually get a design done like this. It is always a special feeling to suddenly find that you…
This is the 3D of a new 1.1 that I never ordered. The only difference from 1.0 is the TVS diods and a few mechanical adjustments. I will remove the address logic at top right, replace the SWD, replace the power connector and move the inner 16 IO ports to the edges while I also…
This rather boring drawing represent my new base for a Hat. Notice that I have removed the addressing scheme from the old ones, added USB and CAN as standard as well as Raspberry PI Hat form and SPI to communicate with the PI. F405 is so fast that we can use higher SPI speed (ca…
A bit different picture this time. This show the component layout and the green lines are the PCB lanes I need to make. I have added the package for the Micro SD Card holder, but I still only use 1.27 pitch headers for the Micro JST connectors. GPIO Header is not wired in schematics yet.…