todbot

#
# wifi-preferred-network.py -- Given a list of preferred networks,
#                              connect to the one with the strongest signal
#                              for CircuitPython ESP32S2 Metro / MagTag 
# 2020 @todbot / todbot.com/blog

import time
import wifi
from secrets import secrets

todbot

# demo_ps2io.py -- simple demo of ps2io PS/2 keyboard library
# 2021 @todbot
# Tested on ESP32S2 Saola board and ItsyBitsy M4 running CircuitPython 6.2.0

import board

# ESP32S2 Saola
#kbd = ps2io.Ps2(board.IO33, board.IO34)
# ItsyBitsy M4
ps2_data_pin = board.D7

todbot

# play with seesaw encoder knob in CircuitPython
import board

from adafruit_seesaw.seesaw import Seesaw
from adafruit_seesaw.neopixel import NeoPixel
from adafruit_seesaw.digitalio import DigitalIO

ss_knob_base_addr = 0x36
ss_switch_pin = 24
ss_neopixel_pin = 6

todbot

import array

def sine_wave(sample_frequency: float, pitch: float):
    """Generate a single sine wav cycle at the given sampling frequency and pitch."""
    length = int(sample_frequency / pitch)
    b = array.array("H", [0] * length)
    for i in range(length):
        b[i] = int(math.sin(math.pi * 2 * i / length) * ((2 ** 15) - 1) + 2 ** 15)
    return b

todbot

# convert a dual pot "360 endless pot" aka sin/cos pot to angle position
# 17 Jun 2023
# JP found these cool dual pots that act like endless rotary encoders, 
#  in a Elektron Samples box.  They have two pots on a single shaft, 
#  one 90º out of phase. e.g. 
# RV112FF-40-15A-0B20K - http://www.taiwanalpha.com/downloads?target=products&id=79
#
# see: https://forum.pjrc.com/threads/59830-Read-Endless-Potentiometer
# answer: float angle = atan2f(potA, potB)
#