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arduino_si5351_gpsdo

Very simple Arduino nano and SI5351 GPSDO using the PPS from a GPS receiver

bars

Code for Arduino progress bars and bargraphs

butterfly-ultimatic-single-lever-morse

C code for emulator between iambic paddle & keyer, AVR Butterfly

digichirp

Simple CW keyer and beacon with simulated chirp and drift, for nostalgia!

gps-clock

k3ng_cw_keyer

K3NG Arduino CW Keyer

magnitude-squared-coherence-for-climate-data

Matlab code for magnitude squared coherence estimation of climate data oscillations for the papers S. Holm, 'On the alleged coherence between the global temperature and the sun's movement,' J. Atmos. Solar-Terrestr. Phys., April 2014 and S. Holm, 'Prudence in estimating coherence between planetary, solar and climate oscillations,' Astrophys. Space Sci., May 2015

multi-face-gps-clock

Multi face GPS clock running on an Arduino Mega where the user can select between 40+ different clock faces on a 20x4 LCD .

pruned-fft

Fortran Fast Fourier Transform code for a pruned input sequence for the paper S. Holm, "FFT Pruning Applied to Time Domain Interpolation and Peak Localization", 1987, IEEE Trans. Acoust.,Speech, Sign. Proc., vol ASSP-35, pp. 1776-1778

season

Calculate the date and time of solstices and equinoctes like Jean Meeus.

simple-circuit-equivalents-for-the-constant-phase-element

Microcap simulation file to accompany the paper Sverre Holm, Thomas Holm, and Ørjan Grøttem Martinsen. "Simple circuit equivalents for the constant phase element." PloS one 16.3 (2021): e0248786.

ultrasoundtempcomp

Temperature compensation for an Arduino ultrasonic distance sensor.