This little circuit show the passive protection I want to add to each analogue and digital line. D1 is a TVS diode set to ca 5V, meaning it will suppress spikes above this level or negative spikes. This is the real light-weight protection. The drawbacks with a TVS is that it takes time to activate…
An early mockup indicate I can manage 15 connector on a Hat with USB, but I will have to remove the external power connector and one of the connectors are CAN1, meaning the actual number of sensors are 14 connectors. If I dropped I2C and SPI I could just about manage 16 Analogue/Digital sensors, but…
Some sensors like 3D sensors are suited to be mounted directly on a Hat, but a majority of sensors actually need to be mounted remotely to provide proper input. To interface to these I need an adapter card with connectors as illustrated above. STM32F405 have 16 ADC inputs that also can be used as GPIO…
To create a drone you need 3D motion sensors with some accuracy and the block diagram above illustrate a Hat with Gyroscope, Accelerometer and Magnetometer + some other sensors. Using a STM32F405 for this purpose is a bit overkill, but I also added RTC and SPI Flash to give the module some motion math…
J7 above is the USB connector on my Hat’s and 44/45 at right is the connection to the MCU. This is all you need to do to have a working USB connected to an STM32. Software is even easier if you just want a serial port. You just install STM32 Virtual Serial port driver for…
This is the PSU used on the LoRa/GPS Hat to allow switching the units on/off. The signal EnGPS connects to a GPIO pin and the MCU must pull it high for GPS to switch on – very simple. One of the functions of a modern EDA is to check schematics and PCB. This works excellent…
I want to make a larger plane using drone technology and the drawing above illustrate a generic control system with 4 thrusters. In this case I suggest 4 main motors because I want to lift a large drone in a simple frame to test thrusters and control logic. But, the illustration is generic in nature.…
UDP is an excellent protocol for sending messages between nodes in a system with Ethernet or Wifi. It’s speed and behavior on a modern PC’s allows in the region of 100,000 messages per sec, which should be sufficient for most applications.To make a Connection you only need two end-Points of which one need to have…
easyIPC is the protocol and collection libraries I use to communicate cross various networks. easyIPC is not bound to a special technology as it provides universal device to device access through a variety of technologies including Ethernet/Wife, RS485, CAN, and SPI and in time others. UDP, SPI, UART and CAN are examples of technologies I…
First 3D draft of the RS485 Hub. I have moved all connectors to left and top because it will be attractive to use this together with RPI 3B+ that have Ethernet/USB at right. As mentioned I could have used XPortHub for this, but I often need exactly RS485/Ethernet in higher density because RS485 is very…