Updates to Raspbian Buster firmware for Raspberry Pi 4
Hank P. suggested that the latest upgrade partially solves some of the heating issues. This article confirms the state of play.
Raspbian AP mode
I have finally nailed down a reliable procedure to setup Raspberry Pi as a wifi hotspot.
I plan to write a small GUI to make this less painful, and also have a “factory reset” option to cleanly remove AP configuration and sofware.
Creating and Monitoring PWM signals with Raspberry Pi
With the help of Rob C. and Chris H., was able to demonstrate creating a 30khZ 10% duty cycle signal using the pigpio library. Could generate both hardware and software PWM signal. Also, used a python program to implement a frequency counter on a GPIO pin.