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12/02/2021 6:47 AM
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Testing Arduino UNO with bitwisetech / popc and MAX6675
miyankizu

Quote

zamunda wrote:

Hello,

Based on the sketch above, I did some roasting with batches of 100gram. I think the result comes out quite nice, from Artisan I can control heat and air conveniently. I mounted the roaster on a wooden box which I can open later to check wirings etc. Bluetooth also works well.
Also built a simple chaff collector which sits on top of the roaster which can be emptied from time to time.

BTW: I disabled the "slew-function" withing the sketch for now since this "messed up" de loop-functionality within Arduino. So far, I did not experience overload problems (which was something this function should help to prevent)

Obviously there is much room for improvement but this was/is an (exciting) learning-by-doing-and-falling process.

Hardware used in this build:
- Princess Popcorn popper (1200W/220V)
- MAX6675 sensor for temp readings
- Arduino UNO (3)
- (Manual) DC voltage adapter for fan
- L298N DC-Motor Controller for slider-controlling the fan from Artisan
- Solid state relay for controlling the heat element
- Bluetooth module HC06 for wireless connection from Artisan to roaster
- DC-adapter iPhone for Arduino

Big thanks to everyone on this forum, if you have any questions/suggestions, please let me know.

Quote

zamunda wrote:

Hello,

Finally, I achieved to connect over Modbus/Bluetooth, I had to change the sketch by assigning PINs to RX/TX other than the dedicated PINs on the Arduino and use SoftwareSerial.

The following sketch worked for me:


#include <max6675.h>
#include <ModbusRtu.h>
#include <SoftwareSerial.h>
SoftwareSerial mySerial(7, 8); // RX, TX

// data array for modbus network sharing
uint16_t au16data[16] = {
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1
};

/**
    Modbus object declaration
    u8id : node id = 0 for master, = 1..247 for slave
    u8serno : serial port (use 0 for Serial)
    u8txenpin : 0 for RS-232 and USB-FTDI
                 or any pin number > 1 for RS-485
*/
Modbus slave(1, mySerial, 0); // this is slave @1 and RS-232 or USB-FTDI

// Pins for thermocouple MAX6675
int thermoDO = 6;
int thermoCS = 5;
int thermoCLK = 4;

MAX6675 thermocouple(thermoCLK, thermoCS, thermoDO);

// declare variable for Arduino pin connected to solid state relay (SSR)
int relay = 9;

// declare variables for Arduino pins connected to fan controller (L293N)
int fan = 10; // ENA of L239N
int in1 = 11; // IN1 of L239N
int in2 = 12; // IN1 of L239N

// declare variables for Arduino pins to power MAX6675:
int vccPin = 3; // 5v power of MAX6675
int gndPin = 2; // gnd of MAX6675

// slew rate limitations for fan control
#define SLEW_STEP 10 // increase in steps of 10% for smooth transition
int target = 0;
int current = 0;

void slew_fan() { // limit fan speed increases
  target = ((au16data[5] / 100.0) * 255);
  if ( target < current ) { // ramping down, so check rate
    uint8_t delta = current - target;
    if ( delta > SLEW_STEP ) // limit the step size
      delta = SLEW_STEP;
    analogWrite(fan, (current - delta ));
    current = current - delta;
  }
  else if ( target > current ) { // ramping up, so check rate
    uint8_t delta = target - current;
    if ( delta > SLEW_STEP ) // limit the step size
      delta = SLEW_STEP;
    //write current fan value for air control
    analogWrite(fan, (current + delta ));
    current = current + delta;
  }
}


void setup() {
  mySerial.begin(19200); // Soft Serial used for communication through Bluetooth module HC-06
  slave.start( ); // 19200 baud, 8-bits, even, 1-bit stop
  // use Arduino pins
  pinMode(relay, OUTPUT);
  pinMode(fan, OUTPUT);
  //fan direction can be reversed by interchanging values for in1 and in2
  pinMode(in1, OUTPUT); digitalWrite(in1, HIGH);
  pinMode(in2, OUTPUT); digitalWrite(in2, LOW);

  pinMode(vccPin, OUTPUT); digitalWrite(vccPin, HIGH);
  pinMode(gndPin, OUTPUT); digitalWrite(gndPin, LOW);
  delay(500);
}

void loop() {
  //write current thermocouple value
  au16data[2] = ((uint16_t) thermocouple.readCelsius() * 100);

  //write current fan value for air control
  // analogWrite(fan, (au16data[5] / 100.0) * 255);
  slew_fan();

  //poll modbus registers
  slave.poll( au16data, 16 );

  // heater control:
  digitalWrite(relay, HIGH);
  delay(au16data[4] * 10);
  digitalWrite(relay, LOW);
  delay((100 - au16data[4]) * 10 - 1);
}


hello zamunda , renatoa I appriciate for your effort. I also try to apply for solutions to my system. Also I have get modbus connection problem. when I check connection baudrate for HC-06 it has written as 9600 and I am not able to change it. I tried another solution to change baudrate in skecth as "9600" instead of "19200". Do you have any solution for it ?
miyankizu attached the following image:
1_22.jpg
 
zamunda
Hello,

I just recently how to work with Arduino and how to change baudrates of the HC-06 so I am not that experienced but this video helped me a lot



In short, you have to connect the RX and TX-pins of the HC-06 to the TX and RX-pin of the Arduino.
Then go to the serial monitor of the IDE and send fe the command 'AT'...it should respond with 'OK'
If you do not get a response you have to tweak settings:
- set baudrate of serial monitor to '9600' if you have not changed initital rate of HC-06
- set "No line ending" in the serial monitor as well
- interchange RX and TX connection cables from HC-06 to Arduino and try again...

Once you get an 'OK' you can change baudrate with command 'AT+BAUD5' if I recall well.

As said, the mentioned video was very helpfull for me.

Hope this helps!

Regards
 
miyankizu

Quote

zamunda wrote:

Hello,

I just recently how to work with Arduino and how to change baudrates of the HC-06 so I am not that experienced but this video helped me a lot



In short, you have to connect the RX and TX-pins of the HC-06 to the TX and RX-pin of the Arduino.
Then go to the serial monitor of the IDE and send fe the command 'AT'...it should respond with 'OK'
If you do not get a response you have to tweak settings:
- set baudrate of serial monitor to '9600' if you have not changed initital rate of HC-06
- set "No line ending" in the serial monitor as well
- interchange RX and TX connection cables from HC-06 to Arduino and try again...

Once you get an 'OK' you can change baudrate with command 'AT+BAUD5' if I recall well.

As said, the mentioned video was very helpfull for me.

Hope this helps!

Regards


thank you very much , I will check and if I found which works for me , I will update this topic
 
miyankizu
Updated info : I changed my skecth again 19200 to 9600 and make same updates on MODBUS connection also in Artisan. And changed jumper cables in case of any problem. Now it works
it reads values well. I haven't test it with popper , till now it goes good. Thanks to zamunda and renatoa :)
 
zamunda
Hello,

Showing some results from Artisan....

I roasted 80grs and 100 grs today playing with Air and Heater...works quite well technically I think...Normally I start with full air and 80% heat and after 3-4 minutes I lower the air a bit and increase some heat. Depending on ambiente temperature, I get first crack at 6-8 minutes, then leave the beans a minute after FC and finally cool them down in the roaster, cooling down to 30-40 degrees goes quite fast (< 1min).
Happy with the result so far...Any comments are highly appreciated!

Did a quick test with PID control but got quite confused with so many parameters to set, in fact, do not know how to start there...
The settings shown in the image copied them from another project without really understanding how it worksGrin
Could some of you help me a bit in explaining the basic concept of PID-control?

Thanks!
zamunda attached the following images:
80grs.png 100grs.png aaa_1.png pid_1.png

Edited by zamunda on 10/06/2021 12:42 PM
 
miyankizu
It is nice to hear that well done ThumbsUp I think you can roast more grams by chaning your power supply of fan. Also adding a tin can at the top of chamber. Because I can swirl 150 grams in my system with 24v 5A.

By the way I built up your system. I can read temperature , but I'm not able to give a control from Artisan. I'm not sure that I can send the data to L298N from Arduino. Can you please share your circuit connection. I try to make my connections over your sketch and picture as I can see Grin

Here is my circuit.



Quote

zamunda wrote:

Hello,

Showing some results from Artisan....

I roasted 80grs and 100 grs today playing with Air and Heater...works quite well technically I think...Normally I start with full air and 80% heat and after 3-4 minutes I lower the air a bit and increase some heat. Depending on ambiente temperature, I get first crack at 6-8 minutes, then leave the beans a minute after FC and finally cool them down in the roaster, cooling down to 30-40 degrees goes quite fast (< 1min).
Happy with the result so far...Any comments are highly appreciated!

Did a quick test with PID control but got quite confused with so many parameters to set, in fact, do not know how to start there...
The settings shown in the image copied them from another project without really understanding how it worksGrin
Could some of you help me a bit in explaining the basic concept of PID-control?

Thanks!
miyankizu attached the following images:
img_2894.jpg inkedimg_2895_li.jpg
 
zamunda
Hello

Yesterday I created a project on Github to make sharing easier:
https://github.co...daroaster/

Haven't uploaded a circuit though but will try to do that shortly.

What is it that you can not control from Artisan? Have you created a slider for both heater and air?

Maybe you could download the settings from the Artisan folder and load these into yours and see how I have configured things (obviously adjust it according your setup, USB or BT, etc):
https://github.co...in/artisan

Hope this helps for now...
 
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