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Helpful Scripts for CircuitPython & Real Time Clocks (RTCs) [01594912346]
I have used two different RTCs in the Feather form factor. One has
the PCF8523, and the other
has the DS3231. The former has an SD card slot while the latter has higher precision including a temperature-compensated crystal oscillator.
Calibrating the DS3231 and PCF8523 RTCs [01594923755]
The DS3231 and PCF8523 real time clocks (RTCs) can
both be calibrated by writing various register values. To follow the
calibration procedures you'll need a frequency counter you trust, with at least
6 digits to calibrate the PCF8523 and 7 digits to calibrate the DS3231. (It
also has to operate at the comparatively low frequency of 32.768kHz; a common
inexpensive 8-digit frequency counter such as the "SANJIAN STUDIO" has a
minimum of 100kHz so it's not usable for this purpose) I use an old HP 5315B
universal counter that has been calibrated against GPS time.
Quad CharliePlex FeatherWing hack [01595078470]
Adafruit makes these neat "CharlieWing" displays that allow you to control a 15x7 LED matrix using…
Pi Zero W USB Proxy [01599489100]
… with a Zero4U hub and Adafruit MiniPiTFT 1.14" attached. To a base raspbian lite system I…
… including tio, udiskie, screen, and Adafruit Blinka; enabled ssh access and disk mounting by the pi…
Using Adafruit Macropad as LinuxCNC Control Pendant [01629313423]
… LinuxCNC's hal_input. For instance, the Adafruit Macropad has a (very coarse, just 20 detents/revolution) encoder, 12…