hezhao

wget http://www2.warwick.ac.uk/fac/sci/statistics/staff/academic/firth/software/pdfjam/pdfjam_latest.tgz
cp pdfjam.conf ~/.pdfjam.conf
# pdflatex='/Library/TeX/texbin/pdflatex'
# paper='letterpaper'
./pdfjam --fitpaper true --nup 2x2 --delta '1mm 1mm' --scale 1.0 input.pdf --outfile output-4up.pdf

hezhao

# Create a new branch locally
$ git checkout -b [branch]

# Create and push the new branch to orign
$ git push origin [branch]

# Merge branch to master
$ git checkout master
$ git merge [branch]

hezhao

# List which process is listening upon port 5000
$ lsof -i :5000

# kill command with PID 12345
$ kill -9 12345

hezhao

# https://devcenter.heroku.com/articles/getting-started-with-django

# Regions
$ heroku regions
$ heroku create --region eu

# Create
$ heroku create
$ git push heroku master

hezhao

import time
import RPi.GPIO as GPIO


GPIO.setmode(GPIO.BOARD)
GPIO.setwarnings(False)
GPIO.setup(8, GPIO.OUT, initial=GPIO.HIGH)
GPIO.setup(10, GPIO.OUT, initial=GPIO.HIGH)

while (True):

hezhao

2N3904 NPN transistor circuit to short a pin to GND.

Also see reference

hezhao

$ sudo raspi-config
$ sudo apt-get update
$ sudo apt-get install supervisor

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<form action="https://shenghuo.alipay.com/send/payment/fill.htm" method="post" target="_blank" accept-charset="GBK" id="alipayForm">
  <input name="optEmail" type="hidden" value="zph61@139.com" />
  <input name="payAmount" type="hidden" value="1.00" />
  <input id="title" name="title" type="hidden" value="捐赠给”前端技术分享”网站" />
  <input name="memo" type="hidden" value="文章写的不错，支持站长,我来捐赠鼓励的！" />
  <input name="pay" type="image" src="https://img.alipay.com/sys/personalprod/style/mc/btn-index.png" width="250" height="58">
</form>

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void loop()
{
  if ( connected ) 
  {
    int packetSize = Udp.parsePacket();
    if ( packetSize != 0 ) {
      Udp.read( data, numPins );
      
      Serial.println( "Data received" );
      

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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Example:
%%%
%%% Create a 3000Hz triangel wave data for 3 seconds, and
%%% play the wave data at 44100Hz (default) sample rate, also
%%% save to .wav file.
%%% 
%%%
%%%      wave = OSCILLATOR('Triangle', 3, 3000);
%%%      soundsc(wave, 44100);