One of the challenges I face is that batches with MCU’s from Asia are dodgy. This has been specially bad on STM32F405RG so I want to make myself a MCU tester for Rx and Cx series. I just tried to wire one and it kind-off works, but SWD wiring get to dodgy so I need…
XPortHub feeding from Raspberry PI 3 A+ this time. 2nd board and 3rd MCU. The 1st MCU started behaving strange, so added a 2nd that did not work at all. Finally ripped off an old good one and we have a working board. Basically I need to make myself a tester for these MCU’s. Regardless,…
I do love then things just work. This came up straight away – no coding, all generated from CubeMX. I need to add a few bits for this to actually work, but it is a first step. Lets see if we can get the rest of this cute Hat design alive as well.
The first 2 Hat’s of my new series arriving – I paid for the fast track because I will be assembling and testing these over x-mas. The PCB at left (above) and below is the XPortHub, the other is the ESP32 based Wifi Hat. The picture below is on top of a Raspberry PI 3…
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…