Monday, July 10, 2017
To measure accuracy and diagnose issues, watchmakers use a watch timer which listens for and measures intervals between ticks. However, the tools are rather expensive for hobbyists, such as yours truly.
Fortunately, free or low-cost options like Watch-o-Scope ease the burden, but require a sensor and preamplifier. Here's my take on this fun little preamp project.
Monday, May 29, 2017
Wednesday, March 29, 2017
But, the Pi has been plagued by the yellow lightning bolt icon, which means "your power supply sucks".
Nothing I've tried, until now, has fixed it. I've been through several phone chargers in 1A, 2.1A, and 2.4A varieties, several USB cables, and I've tried a Pololu 3.5A step-down switching regulator, and my own prototype 3A step-down regulator (I think I broke it?!)
My solution: power the touchscreen and Pi from independent phone chargers, after disconnecting the 5V jumper between them. Hope this helps someone else.
Subscribe and stay tuned for a future article on my Jeep-mounted Overland Expedition Pi with offline Mapping, Satellite Telemetry and Messaging to HQ, and APRS.
Tuesday, January 17, 2017
I've finally fixed my only vintage phone, an old Western Electric 302, and thought I'd share the old telephones' electro-mechanical guts.