TheRayTracer’s gists

TheRayTracer / activity1.png

Last active December 11, 2019 03:40

Basic example of a 555 timer flashing led circuit from first principles. Source is from a 5V USB adaptor.

TheRayTracer / SSD1351.py

Last active August 3, 2019 23:59

The below Python source files implement an OLED display driver for the SSD1351 chipset using the SPI interface. The source code provides an interactive example – the classic Snake game that minimise screen redraw and makes use of the Curses library.

	import struct
	import spidev
	import sys
	import time
	import random
	import RPi.GPIO as gpio

	ascii = [
	[ 0x55, 0x00, 0x55, 0x00, 0x55 ],
	[ 0x55, 0x00, 0x55, 0x00, 0x55 ],

TheRayTracer / bitcoin_bip_0039.py

Created April 7, 2018 21:22

Custom implementation of BIP 39.

	import sys
	import binascii
	import hashlib
	import random
	import hmac
	import pbkdf2

	PBKDF2_ROUNDS = 2048

	# Custom implementation of BIP 39: https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki

TheRayTracer / plot_a.png

Last active August 11, 2017 09:54

This is a model for the Titanic Kaggle tutorial. Score was 0.79426.

TheRayTracer / MTK3339.py

Last active December 5, 2018 19:40

A simple snippet of Python to parse a few NMEA sentences read from a MTK3339 device on a Raspberry Pi v3.

	import serial #sudo apt-get install python-serial
	import time
	import RPi.GPIO as gpio

	PMTK_ACK = '$PMTK001'
	PMTK_INVALID = '0'
	PMTK_UNSUPPORTED = '1'
	PMTK_VALID_FAILED = '2'
	PMTK_VALID_SUCCESS = '3'

TheRayTracer / bitcoin_address_generator.py

Created August 18, 2016 11:35

This is a reference implementation for generating an offline Bitcoin address.

	import sys
	import re
	import binascii
	import ecdsa
	import hashlib
	# import random
	import Crypto.Random.random as rand

	b58 = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"

TheRayTracer / MAX7219.py

Last active January 12, 2019 08:43

This addition helps to drive a MAX7219 chipset for controlling Seven Segement displays and 8x8 led matrices. See the wiring diagram for connection to a Raspberry Pi.

	import time
	import math
	import spidev
	import RPi.GPIO as gpio

	NO_OP = 0x0
	REG_DIGIT0 = 0x1
	REG_DIGIT1 = 0x2
	REG_DIGIT2 = 0x3
	REG_DIGIT3 = 0x4

TheRayTracer / mushrooms_explore_a.png

Last active October 6, 2022 20:30

Using R to explore the UCI mushroom dataset reveals excellent KNN prediction results.

TheRayTracer / SSD1331.py

Last active March 12, 2020 13:18

The below Python source files control an OLED display (size 96 x 64, 65K colours) using a SSD1331 chipset and the SPI interface. The source code initialises the chipset and includes hardware accelerated functions for drawing primitive shapes and a non-hardware accelerated full ASCII set. Examples include a basic Space Invaders game, and a clock.

	import struct
	import spidev
	import sys
	import time
	import random
	import RPi.GPIO as gpio

	ascii = [
	[ 0x55, 0x00, 0x55, 0x00, 0x55 ],
	[ 0x55, 0x00, 0x55, 0x00, 0x55 ],

TheRayTracer / SSD1306.py

Last active August 4, 2019 00:03

The below Python source controls an OLED display (size 128 x 64) using a SSD1306 chipset and the SPI interface. The source code initialises the chipset setting the 2 orange pages at the top of the display, and includes functions for drawing primitive shapes and a full ASCII set.

	import struct
	import spidev
	import sys
	import time
	import random
	import RPi.GPIO as gpio

	ascii = [
	[ 0x55, 0x00, 0x55, 0x00, 0x55 ],
	[ 0x55, 0x00, 0x55, 0x00, 0x55 ],

Simon Flannery TheRayTracer