Hi
Just bought this:
[www.aliexpress.com]

Using a Rumba Board with Marlin Firmware

Can someone help me setting it?

Rumba has no support for directly connecting a Thermocouple, you need a thermocouple amplifier chip and feed the output into one of the ADC inputs, eg 'MAX31855 breakout'

product eg
[reprapworld.com]

What do you think it's the best for me to buy, and can you help me on the connections and settings for marlin.
I forgot to mention, but i have dual extruder setup, both with k-type

Not clear where you are and what your sources are. Plus you don't say what your extruder is but if you first look in marlin/configuration.h and scroll down to the the Thermal Settings section you will see along list of thermistors that are supported. I'd find a local/easy source of one that is on that list. It will be far cheaper to buy a couple of those than to get sense amplifiers for the thermocouples.

Hi
Just bougth two External thermocouple board v1.0
After several searches made the conections as you can see on the attach.
In marlin set:
#define TEMP_SENSOR_0 -1
#define TEMP_SENSOR_1 -1

Pins used
+5v pin 2
Ground pin 4
Signal 1 pin 6
Signal 2 pin 5

First time i tried i got 300º for extruder 1 and 2

Changed in config_adv
#define TEMP_SENSOR_AD595_GAIN 0.1

tried and it reads 30º for both, but if i turn on any heater i don't get any changes on temperature.

Can someone help me on that.
I tried searching, but i can't find much information on this theme

Looking at the circuit of the rumba, EXP3 pins 5 & 6 are pwm outputs.

I think EXP3 pins 7 & 8 are what you need to connect the signals to as these are ADC 9 & 10 inputs.

Managed to get it wright at last, thanks for your suport carl_m1968

Here are my conetions:




Changes made on Marlin

Configuration.h
#define TEMP_SENSOR_0 -1
#define TEMP_SENSOR_1 -1

Pins_RUMBA.h

// Temperature Sensors
//
#if TEMP_SENSOR_0 == -1
#define TEMP_0_PIN 10 // Analog Input (connector *K1* on RUMBA thermocouple ADD ON is used)
#else
#define TEMP_0_PIN 15 // Analog Input (default connector for thermistor *T0* on rumba board is used)
#endif

#if TEMP_SENSOR_1 == -1
#define TEMP_1_PIN 9 // Analog Input (connector *K2* on RUMBA thermocouple ADD ON is used)