SPI is a very powerfully and fast serial port used between Master and one or more slaves, but I want to evolve the bus into a proper device to device bus. This is actually far more straight forward than I expected as both Raspberry PI and STM32F405 support Half-Duplex modes. RPI only support Half-Duplex Master,…
I finished the LoRa + GPS w/E22-900M30S earlier today and decided to add in E22-900M22S footprint. The modules are almost identical except in size. The only difference is that 30S have pin 10 to 3.3V while 22S have this to ground, so it is straight forward to have both footprints on the PCB. The 3D…
IPX Antenna for LoRa directly on the module. PCB Antenna for LoRa. Power leds + MCU Status. USB Connector for MCU. Separate Power connector. GPS Module. Can use NEO-6M, NEO-7M or NEO-8M. GPS Antenna. USB for GPS Module. UART TTL. SWD STM32F405RG. Powerfully ARM M4 capable of running MicroPython. Raspberry PI Connector. CAN Port. LoRa…
This is a LoRa and GPS Hat. The larger E22-900M30S with a range of 12km at left and the small NEO-6M at right. NEO-7M and NEO-8M should also work. I mistook NEO-6M for having a SPI interface, but realized this was for Flash/EEPROM. I replaced coils normally used to separate frequency interference with 3 x…
This is the first mock-up with the LoRa unit on. This is the larger and stronger of the modules and it occupied a bit more place than I expected, but I will do. It’s not much passive components on these modules and I still think I have just about the space for the GPS and…
Packing a LoRa and GPS module on the same Hat should be possible and make a lot of sense. I could pack a battery manager as well, but I rather just make a separate board with battery on and this can be stacked on the back of this unit anyway. The MCU is the classic…
I decided to add the Hat form and RPI connection to my Hat allowing me to use this as a PSU as well. I need far more powerfully PSU’s than this, but TPS54260 can deliver 2.5A on any voltage I need, so it’s a beginning + its 3 voltages coming from this board so why…
TPS54x60 is a very nice DC/DC converter covering up to 60V, but the circuit I used on the MC3X60V3A Motor Driver snapped at 30V+. I tested with 2 units before consulting a friend that suggested to add a 10uF capacitor very close to VIN. I have yet to test this because I did not want…
SIM7020E is a small module that offer 4G services and access to the new NB-IoT service that is available to give access to remote sensors that earlier was not possible. All-in-All this is just a new wrapping on a service that have been available since GSM and can be achieved with several low cost modules.…
Hall sensor logic 60V DC/DC Converter Gate Drivers Raspberry PI Connector MCU SuperCap for 3,3V on MCU Raspberry PI mount holes Mount holes for heat-sink Leds SWD USB 2 x End point sensors PSU Capacitance CAN port +60V MOSFET Array GND Extra GND Connectors Current Sensors Phase output 2 x Temperature Sensors.