pi-coin

pi@raspberrypi:~ $ cat btc-start.sh
#!/bin/bash
nice bitcoind -daemon
sudo -H -u pi bash -c 'nohup /home/pi/btc-monitor.sh & >/dev/null 2>&1'
sudo -H -u pi bash -c 'nohup python /home/pi/btc-display.py & >/dev/null 2>&1'

pi@raspberrypi:~ $ cat btc-stop.sh
#!/bin/bash
kill `ps aux | grep btc-monitor | grep -v grep | awk '{print $2}'`
kill `ps aux | grep btc-display | grep -v grep | awk '{print $2}'`
cat <<EOF | python
from sense_hat import SenseHat
SenseHat().clear()
EOF
bitcoin-cli stop
tail -f ~/.bitcoin/debug.log

pi@raspberrypi:~ $ cat btc-monitor.sh
#!/bin/bash
while true; do
  bitcoin-cli getblockcount >/home/pi/btc-blockcount.txt
  sleep 30
done



pi@raspberrypi:~ $ cat btc-display.py
from sense_hat import SenseHat
from time import sleep
import subprocess
import requests
import thread
import json
import math
import time
import os

sense = SenseHat()

black = (0,0,0)
red = (64,0,0)
blue = (0,0,64)
green = (0,64,0)
white = (64,64,64)
yellow = (64,64,0)
orange = (128,64,0)

chars = {'0': [3, 7,5,5,5,7],
         '1': [3, 2,2,2,2,2],
         '2': [3, 7,1,7,4,7],
         '3': [3, 7,1,3,1,7],
         '4': [3, 5,5,7,1,1],
         '5': [3, 7,4,7,1,7],
         '6': [3, 7,4,7,5,7],
         '7': [3, 7,1,2,2,2],
         '8': [3, 7,5,7,5,7],
         '9': [3, 7,5,7,1,1],
         '.': [1, 0,0,0,0,1],
         ' ': [1, 0,0,0,0,0],
        }

def draw_char(ch,x,y,col):
  w = chars[ch][0]
  for r in chars[ch][1:]:
    for b in range(0,w):
      if r & 2**(w-1-b):
        sense.set_pixel(x+b, y, col)
      else:
        sense.set_pixel(x+b, y, black)
    y += 1

def draw_price(p):
  s = str(p/1000.0)
  if s[0] == '0': s = s[1:]
  s = s[:3]
  if s[-1] == '.': s = s[:-1]
  col = white
  x = 0
  for ch in s:
    if ch == '.': col = green
    draw_char(ch,x,3,col)
    if ch == '.':
      x += 1
      col = blue
    else:
      x += chars[ch][0]
      if x <= 7: draw_char('.',x,3,black)
      x += 1

def behind():
  try:
    cnt = int(open('/home/pi/btc-blockcount.txt').readline().replace("\n",""))
    lst = int(requests.get("https://blockchain.info/q/getblockcount").text)
    if cnt > lst: lst = cnt
    return lst - cnt
  except:
    return -1

def price():
    # return int(float(requests.get("https://api.coinbase.com/v2/prices/spot?currency=USD").json()['data']['amount']))
    return int(float(requests.get("https://api.cryptowat.ch/markets/bitfinex/btcusd/price").json()['result']['price']))

def draw_line(r,l,c1,c2):
  for i in range(0,l):
    sense.set_pixel(i,r,c1)
  for i in range(l,8):
    sense.set_pixel(i,r,c2)

def draw_status(n):
  if n < 0:
    draw_line(0, 8, red, red)
  elif n < 8:
    draw_line(0, 8-n, green, orange)
  else:
    draw_line(0, 8, orange, orange)

def draw_temp(t):
  min = 45
  max = 70
  n = 8*(t-min)/(max-min)
  if n < 0: n = 0
  if n > 8: n = 8
  draw_line(1, n, red, yellow)

def cpu_temp():
  temp = os.popen("vcgencmd measure_temp").readline()
  return int(float(temp.replace("temp=","").replace("'C\n","")))

lock = thread.allocate_lock()

def wait(t):
  r = 0
  dt = t/8.0
  for p in range(0,8):
    lock.acquire()
    px = sense.get_pixel(p, r)
    hi = [0,0,0]
    for i in range(0,3):
      if px[i] > 0: hi[i] = min(px[i]+64,255)
    sense.set_pixel(p, r, (hi[0],hi[1],hi[2]))
    sleep(dt)
    sense.set_pixel(p, r, (px[0],px[1],px[2]))
    lock.release()
    sleep(0.01)

display_on = 1
b = 0
p = 0
t = 0

def draw(b,p,t):
  lock.acquire()
  if display_on:
    sense.clear()
    draw_status(b)
    draw_temp(t)
    draw_price(p)
  else:
    sense.clear()
  lock.release()

def toggle_display(event):
  global display_on
  if event.action == 'pressed':
    display_on = 1 - display_on
    draw(b,p,t)

sense.stick.direction_any = toggle_display

while True:
  try:
    b = behind()
    p = price()
    t = cpu_temp()
    draw(b,p,t)
    wait(5)
  except KeyboardInterrupt:
    break

sense.clear()