this week assignement are:

• design and build a wired &/or wireless network connecting at least two processors

Bluetooth

This week i choose to use an HM10 for my weekly project. it was the first time i used it. An HM10 is a bluetooth low energny (BLE) Module, really cheap when we buying from china, we can find some on amazon on a breakout board, it's what i choosed.
An HM10 work on the serial you can find 4 pinout on the breakout board.

• VCC
• GND
• Rx
• TX

first connection

• AT+NAMEthenameyouwant
• AT+NAME? will tell you what the current name of the board
• AT+ADDR? Will tell you what the MAC Adress of the board
• AT+CONtheMacAdressOfaSecondBoard make possible to connect to only one other board when it find it.
• AT+CLEAR will forgot the macaddress of the second board, if you don't need it anymore
• AT+RESET will reset the board at the origin
so the first thing i did was to rename my board to FABACADEMY verify that the board is in slave mode:

AT+MODE1

AT+ROLE0

so now i can connect it to my phone

Android & bluetooth

i started by install an app on my android Phone Then we have to connect on your phone to bluetooth module. then we can open the app we installed, and try to sent something into the terminal yay! it's working!



reading a sensor

so now it's time to read a sensor. for that i decide to read my input device. a bendsensor. so for this part i plug the BLE module to my ATtiny44, with the same code of the imput week we can read the sensor on my phone. ET VOILAA! i'am able to read the value from a sensor from my board to my computer without cable ! --


file of the week.

here you'll find the file of the week

For downloading
right click and save as

• Ino file (RIGHT CLICK - SAVE AS)
--

Going Further

The idea is to sent a value from an attiny44 to an another one. Sending the value it's pretty simple, the value is read by the serial, and goig to the other HM10 (we already match the two of them before with the AT+Command)

now it's time to receive the value of the flex sensor with an another attiny44. For that it's Should be pretty simple. you have to connect the HM10 A to your computer into the ftdi like we already did, but we have to change something. we have to tell to the board to always connect to a specific hm10BOARD for that we will use AT COMMAND.

AT+CON41513CE6FFA

and check if the other bluetooth module is a slave or a master. when you did that. normaly you are able to read the bending value into your computer from the ftdi. now we have to make some code:

Time to code

so here it's starting to being dificult for me, because is not about electronic or fabrication but code. so we already now that i can send the code of the flex sensor. to an another HM10.
we have to tell to the output board that when you receive some code from the ftdi the led -or the motor change status in theory that the job, in reallity i'm stuck here. i don't know why my code is not working.
i started by using simple code with serial print.


	#include "SoftwareSerial.h"
//const int MOTOR = 8;
const int LED = A2;

const int FLEX =A7; // FLEXSENSOR

const int Rx = A0;

const int Tx = A1;

SoftwareSerial mySerial(Rx, Tx);

int val = 0;

void setup(){

pinMode(LED, OUTPUT);
pinMode(Rx, INPUT);
//pinMode(MOTOR,OUTPUT);
pinMode(Tx, OUTPUT);

mySerial.begin(9600);

}

void loop()

{


delay(50);

val = analogRead(FLEX); // read the FLEXSENSOR

mySerial.println(val); // send the value to Serial Monitor, ^Cmd-M


if (val < 300)
  {
             digitalWrite(LED,HIGH);
  }
else
{
  digitalWrite(LED, LOW);
}

}

but it wasn't working so i decide to look at some tutorials on the web, some of them are talking about the need to add some line like : "mySerial.available()"


	#include "SoftwareSerial.h"
const int MOTOR = 8;
const int LED = A2;

//const int FLEX =A7; // FLEXSENSOR

const int Rx = A0;

const int Tx = A1;

SoftwareSerial mySerial(Rx, Tx);

int val = 0;

void setup() {

  pinMode(LED, OUTPUT);
  pinMode(Rx, INPUT);
  //pinMode(MOTOR, OUTPUT);
  pinMode(Tx, OUTPUT);

  mySerial.begin(9600);
delay(3000);
}

void loop()

{
  char recvChar;
  while(1){
    if(mySerial.available()) {
       recvChar = mySerial.read();

       if (mySerial.read() == "1")
       digitalWrite(LED,LOW);
delay(200);}
       else
       digitalWrite(LED,HIGH);
    }
  }

it didn't work either. i made multiple test without founding what's wrong in my code./ UPDATE. i found the problem. for reading the value from the HM10 we need a specific libray for making it work. so next step will be to find the way to make it work.