September 2018 by root

Link for add board manager

http://arduino.esp8266.com/stable/package_esp8266com_index.json

Erase the esp

esptool.py erase_flash

Code to flash AT firmware to ESP8266 (ESP8266_AT_Bin_V1.5.1)

esptool.py --baud 115200 --port /dev/tty.wchusbserial1420 write_flash -fm dio -ff 40m -fs detect 0x00000 boot_v1.7.bin 0x01000 user1.1024.new.2.bin 0xfc000 esp_init_data_default.bin 0x7e000 blank.bin 0xfe000 blank.bin

September 2018 by root

L293D is a DC motor controller.

Below Arduino code to use it.

unsigned char table[128] = {0};

int motor1_A=6;
int motor1_B=5;
int motor1_Speed=3;              

void setup()
{  
  pinMode(motor1_A,OUTPUT);
  pinMode(motor1_B,OUTPUT);
}

void loop()
{
  // motor1
  for (int i=0; i<256; i+=1){
    digitalWrite(motor1_A,HIGH); // A = HIGH and B = LOW means the motor will turn right
    digitalWrite(motor1_B,LOW);
    analogWrite(motor1_Speed,i); // speed counts from 0 to 255
    delay(20);
  }
  for (int i=255; i>0; i-=1){
    digitalWrite(motor1_A,HIGH); // A = HIGH and B = LOW means the motor will turn right
    digitalWrite(motor1_B,LOW);
    analogWrite(motor1_Speed,i); // speed counts from 0 to 255
    delay(20);
  }
}

September 2018 by root

To launch a program at reboot.

contab -e

Add following line to crontab file:

@reboot sudo python /home/pi/hw-home.py /home/pi/hw-home.txt

September 2018 by root

If you want to read Arduino serial from Python.

Install pySerial:

pip intall pyserial

the code:

import serial
...
print('# Arduino Reader - hackweb')
print('entering loop...')

ardu = serial.Serial('COM3', 115200)

time.sleep(2)

while True:

print(ardu.readline())

August 2018 by root

Maybe my favourite one. A great story in the deep of a great champion.

This book tells about youth, life, decisions. It’s the soul of a man vs the mysteries of life.