Robert C Edwards robertcedwards

Guide to PROGMEM on ESP8266 and Arduino IDE

Intro

On low memory devices like the arduino and esp8266 you do not want strings to be stored in RAM. This occurs by default on these systems. Declare a string const char * xyz = "this is a string" and it will use up RAM.

The solution on these devices is to allow strings to be stored in read only memory, in Arduino this is the PROGMEM macro. Most of my experience is with the ESP8266 which is a 32bit micros controller. This device stores PROGMEM data in flash. The macro PROGMEM on ESP8266 is simply

#define PROGMEM   ICACHE_RODATA_ATTR

To get this working, you'll need the [live-streaming software from RICOH][1]. Install that and follow the [live video instructions][2] to connect your camera to your computer and have it show up as a video source.

If you're on a Mac, you can open up the FaceTime app and test it by picking "THETA UVC Blender" from the Video menu.

Once all of that is working, open up index.html and you should see the video rendered on the inside of a sphere that you can rotate around. Use the mouse to click and drag to move the camera around and the mouse wheel to zoom in and

Dimensional

Matrices with friendly semantics and a familiar interface

var x: Matrix = [[1, 2, 3], [5, 6, 7]]
x.columns.append([4, 8])
let y = -x * x.transpose
assert(y.determinant == 320)

	# in a terminal
	# python -m pip install --user opencv-contrib-python numpy scipy matplotlib ipython jupyter pandas sympy nose


	import cv2
	import pandas as pd
	import numpy as np
	import imutils
	from scipy.spatial import distance as dist
	from imutils import perspective

	in case of inverting rotate (clockwise 180 degree),

	⎡-1 0 1 ⎤
	⎜ 0 -1 1 ⎥
	⎣ 0 0 1 ⎦

	#!/bin/bash
	#
	# CloudyGamerLauncher by Larry Gadea
	# Easily start/stop Paperspace and Parsec instances
	#
	# Make sure to fill out the variables below. For the machine id, use the
	# 8-letter identifier for the machine on Paperspace (ex. PS8RGDUY)
	#
	# Note: Requires Paperspace API key (generate one in account settings)

	#!/usr/bin/env python

	#title :measure.py
	#description :An image processing script for measurments
	#author :Oles Andrienko, Adrian Rosebrock
	#date :20161110
	#version :0.1
	#usage :python measure.py [-l] <reference_length>
	#python_version :2.7.12
	#==============================================================================

	#!/bin/sh +ux
	# We set the sh +ux flags so that we error on undefined variables and error on bad commands

	help() {
	echo >&2 "$0 [-f] [-p] [-q] [<priv_key_file>] [<key_type>] [<key_comment>]"
	echo >&2
	echo >&2 "-q / --quiet to silent all output (except -p if passed)"
	echo >&2 "-p / --pubkey to output public key after generation"
	echo >&2 "-f / --force to force replacing existing key"
	echo >&2

	#include "MFRC522/MFRC522.h"

	/*
	Function Core Pin MRFC522 Pin
	Reset D2 RST
	SPI SS D1 SDA
	SPI MOSI A5 MOSI
	SPI MISO A4 MISO
	SPI SCK A3 SCK
	*/

	import socket
	import struct
	import binascii
	from time import sleep
	from phue import Bridge

	b = Bridge('192.168.1.247') # Enter bridge IP here.
	turnOn = {'transitiontime' : 1, 'hue' : 34112, 'sat' :254, 'on' : True, 'bri' : 254}
	turnOff = {'on' : False}

Robert C Edwards robertcedwards

Guide to PROGMEM on ESP8266 and Arduino IDE

Intro

Dimensional

Calculua