Who is here? 1 guest(s)
 Print Thread
Testing Arduino UNO with bitwisetech / popc and MAX6675
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...
 
zamunda
Hello,

Updated the sketch for this project (with a big help of a friend) since I felt this could be done more efficiently within the loop separating controls for air, temperature and heater. Within the previous version, delays for air and temperature depended on the heater-delay.

Did some roasts with this setup and there is evidently less delay in response when moving sliders within Artisan for air, also temp changes are shown at a higher frequency.

https://github.co...Heater.ino

Please let me know if you have any comments.

Regards,
Bert
########################
### A lot can happen over coffee ###
########################
 
zamunda
Hello,

In order to test the minimal 'delay' (=conversion time) for the MAX6675 to be set within the loop, I added a temporary slider within Artisan. Its value is send to Arduino, this way I could determine by increasing/diminishing airflow that using '200ms' is still ok, '150ms' freezes the temperature showing within Artisan...



'20' = 200ms
'15' = 150ms
etc.
zamunda attached the following image:
whatsapp_image_2021-12-03_at_135025.jpeg

Edited by zamunda on 12/05/2021 8:24 AM
########################
### A lot can happen over coffee ###
########################
 
renatoa
Chip specs say 250 ms, better stay on the safe side.
 
Golfkung
Help me please. I follow coding reference below. and I big thank first.
But I found problem from this .Please refer tu attached figure for my problem.


Quote

zamunda wrote:

Hello Renatoa,

Thanks for explaining how to work with the fan and MODBUS. I did a quick test with a separate fan and this works...
Only thing I noticed is that the fan reacts only after 2-3 seconds when moving the air slider...

This is the sketch I have used right now (see below), tomorrow I will test it with a roaster...

Also will try to look into the TC4 code regarding the big current issue.

A big thanks again and I'll keep you posted!


#include <max6675.h>
#include <ModbusRtu.h>

// 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, 0, 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

void setup() {
  slave.begin( 19200); // 19200 baud, 8-bits, even, 1-bit stop
  // use Arduino pins
  pinMode(relay, OUTPUT);
  pinMode(fan, OUTPUT);
  pinMode(in1, OUTPUT);
  pinMode(in2, OUTPUT);
   
  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);
  digitalWrite(in1, HIGH);
  digitalWrite(in2, LOW);

  //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);
}

Edited by Golfkung on 04/11/2023 9:08 AM
 
renatoa
Which figure ? You only quoted a post...
 
Golfkung

Quote

renatoa wrote:

Which figure ? You only quoted a post...


I have alreaady attached picture.
 
Golfkung

Quote

renatoa wrote:

Which figure ? You only quoted a post...


For serial log====>
version = 2.8.2

24 22:02:29.027 MODBUS readSingleRegister : 0.0ms => /dev/cu.wchusbserial140,19200,8,N,1,0.6 || Slave = 1 || Register = 2 || Code = 3 || Rx = None || retries = 0
================================================================================f
For Artisan platdorm
version = 2.8.2 (f525b16)
Architecture = ('64bit', '')
Mac = ('13.3.1', ('', '', ''), 'x86_64')
Machine = x86_64
Platform name = macOS-13.3.1-x86_64-i386-64bit
Processor = i386
Python Branch =
Python Build = ('main', 'Dec 8 2022 16:43:53')
Python Compiler = Clang 12.0.0 (clang-1200.0.32.28)
Python Implementation = CPython
Python Revision =
Python version = 3.11.0
Release = 22.4.0
System = Darwin
Version = Darwin Kernel Version 22.4.0: Mon Mar 6 21:00:41 PST 2023; root:xnu-8796.101.5~3/RELEASE_ARM64_T8103
 
Golfkung

Quote

Golfkung wrote:

Quote

renatoa wrote:

Which figure ? You only quoted a post...


For serial log====>
version = 2.8.2

24 22:02:29.027 MODBUS readSingleRegister : 0.0ms => /dev/cu.wchusbserial140,19200,8,N,1,0.6 || Slave = 1 || Register = 2 || Code = 3 || Rx = None || retries = 0
================================================================================f
For Artisan platdorm
version = 2.8.2 (f525b16)
Architecture = ('64bit', '')
Mac = ('13.3.1', ('', '', ''), 'x86_64')
Machine = x86_64
Platform name = macOS-13.3.1-x86_64-i386-64bit
Processor = i386
Python Branch =
Python Build = ('main', 'Dec 8 2022 16:43:53')
Python Compiler = Clang 12.0.0 (clang-1200.0.32.28)
Python Implementation = CPython
Python Revision =
Python version = 3.11.0
Release = 22.4.0
System = Darwin
Version = Darwin Kernel Version 22.4.0: Mon Mar 6 21:00:41 PST 2023; root:xnu-8796.101.5~3/RELEASE_ARM64_T8103


Sorry for many tiom. I would like re attach picture.
Golfkung attached the following image:
image_11-4-2566_be_at_2037.jpg
 
Jump to Forum: