Arduino with HC-05 Bluetooth module

2019-03-18 in blog on iot, hackathon

HC‐05 module is an easy to use Bluetooth SPP (Serial Port Protocol) module,designed for transparent wireless serial connection setup.The HC-05 Bluetooth Module can be used in a Master or Slave configuration, making it a great solution for wireless communication.This serial port bluetooth module is fully qualified Bluetooth V2.0+EDR (Enhanced Data Rate) 3Mbps Modulation with complete 2.4GHz radio transceiver and baseband. It uses CSR Bluecore 04‐External single chip Rluetooth system with CMOS technology and with AFH (Adaptive Frequency Hopping Feature).

https://www.youtube.com/watch?v=QUQta4f_87E
https://www.instructables.com/id/Upgrade-Your-3-Bluetooth-Module-to-Have-HID-Firmwa/
https://eggelectricunicycle.bitbucket.io/Flash_and_Debug_STM32–Flash_firmware_using_Bluetooth–ZS-040_Bluetooth_module.html
https://m.blog.naver.com/PostView.nhn?blogId=gauya&logNo=221223134228&proxyReferer=https%3A%2F%2Fwww.google.com%2F
http://blog.naver.com/PostView.nhn?blogId=rlrkcka&logNo=220602311579&parentCategoryNo=&categoryNo=18&viewDate=&isShowPopularPosts=true&from=search
http://blog.naver.com/PostView.nhn?blogId=zeta0807&logNo=221179614788
http://www.hardcopyworld.com/gnuboard5/bbs/board.php?bo_table=tech_comm&wr_id=32
https://medium.com/wasd/%EC%95%84%EB%91%90%EC%9D%B4%EB%85%B8%EB%A1%9C-%EB%B9%84%EC%BD%98%EC%9D%84-%EA%B5%AC%ED%98%84%ED%95%B4%EB%B3%B4%EC%9E%90-fc7a8c223eec
https://github.com/pa7/heatmap.js

??
https://heatmap.com/
https://stackoverflow.com/questions/2369492/generate-a-heatmap-in-matplotlib-using-a-scatter-data-set

import sys
!{sys.executable} -m pip install py-sphviewer

import numpy as np
import numpy.random
import matplotlib.pyplot as plt
import sphviewer as sph

def myplot(x, y, nb=32, xsize=500, ysize=500):   
    xmin = np.min(x)
    xmax = np.max(x)
    ymin = np.min(y)
    ymax = np.max(y)

    x0 = (xmin+xmax)/2.
    y0 = (ymin+ymax)/2.

    pos = np.zeros([3, len(x)])
    pos[0,:] = x
    pos[1,:] = y
    w = np.ones(len(x))

    P = sph.Particles(pos, w, nb=nb)
    S = sph.Scene(P)
    S.update_camera(r='infinity', x=x0, y=y0, z=0, 
                    xsize=xsize, ysize=ysize)
    R = sph.Render(S)
    R.set_logscale()
    img = R.get_image()
    extent = R.get_extent()
    for i, j in zip(xrange(4), [x0,x0,y0,y0]):
        extent[i] += j
    print extent
    return img, extent

fig = plt.figure(1, figsize=(10,10))
ax1 = fig.add_subplot(221)
ax2 = fig.add_subplot(222)
ax3 = fig.add_subplot(223)
ax4 = fig.add_subplot(224)


# Generate some test data
x = np.random.randn(1000)
y = np.random.randn(1000)

#Plotting a regular scatter plot
ax1.plot(x,y,'k.', markersize=5)
ax1.set_xlim(-3,3)
ax1.set_ylim(-3,3)

heatmap_16, extent_16 = myplot(x,y, nb=16)
heatmap_32, extent_32 = myplot(x,y, nb=32)
heatmap_64, extent_64 = myplot(x,y, nb=64)

ax2.imshow(heatmap_16, extent=extent_16, origin='lower', aspect='auto')
ax2.set_title("Smoothing over 16 neighbors")

ax3.imshow(heatmap_32, extent=extent_32, origin='lower', aspect='auto')
ax3.set_title("Smoothing over 32 neighbors")

#Make the heatmap using a smoothing over 64 neighbors
ax4.imshow(heatmap_64, extent=extent_64, origin='lower', aspect='auto')
ax4.set_title("Smoothing over 64 neighbors")

plt.show()

SoftwareSerial BTserial(8, 9); // RX | TX
 
const long baudRate = 38400; 
char c=' ';
boolean NL = true;
 
void setup() 
{
    Serial.begin(9600);
    Serial.print("Sketch:   ");   Serial.println(__FILE__);
    Serial.print("Uploaded: ");   Serial.println(__DATE__);
    Serial.println(" ");
 
    BTserial.begin(baudRate);  
    Serial.print("BTserial started at "); Serial.println(baudRate);
    Serial.println(" ");
}
 
void loop()
{ 
    // Read from the Bluetooth module and send to the Arduino Serial Monitor
    if (BTserial.available())
    {
        c = BTserial.read();
        Serial.write(c);
    }
 
    // Read from the Serial Monitor and send to the Bluetooth module
    if (Serial.available())
    {
        c = Serial.read();
        BTserial.write(c);   
 
        // Echo the user input to the main window. The ">" character indicates the user entered text.
        if (NL) { Serial.print(">");  NL = false; }
        Serial.write(c);
        if (c==10) { NL = true; }
    }
}