Extra temperature monitoring sensors

Dear forummers,

I am building my own printer using an Arduino mega & ramps 1.4 for my school project.
However, i am required to put in extra temperature monitoring sensors, ideally before and after the extruder heater.
I've already used T0 & T1 for bed & hot end thermistors.
Is there any other method for me to expand the usage of ramps?


Thanks

If you just need one additional thermistor, you can just connect it to T2. If you need to connect more thermistors, you can use any of the non-used analog inputs on connectors AUX-1 (A3, A4) and AUX-2 (A5, A9, A10, A11, A12) and connect the thermistor using the same R=4k7 C=10uF circuit as is used for T0,T1,T2 (see the RAMPS schematics).

So the hardware part is easy, but you will also need to modify your firmware for whatever you want these temperature sensors to be used for...

Hi enif, thank u for your explanation & suggestion.
I shall look into the configuration.
However for the firmware side, do i need to modify it in sketch or configuration.h?

If you just want to see two more temperatures, you might use a second set of arduino/ramps/LCD ( configured as EEF )

If you want to use only one controller and see the temperatures on the same LCD you´d have to modify the code. Also for defining pins as temp-inputs.
If those temps are supposed to control something, you have to write it on your own.
-Olaf

Hi Olaf, thanks for your input.
Yes, I want to see 2 more temperature sensors.
U mentioned that for the 2nd set board, I need to configure it as EEF, which is in board.h I assumed?
Do I configure it in same Marlin file which I am currently on?

The EEF configuration happens in marlins configuration.h line 65-67

#ifndef MOTHERBOARD
  #define MOTHERBOARD BOARD_RAMPS_13_EEF
#endif

Using a second set of arduino/ramps is a quick & dirty solution, but for R & D purpose a pragmatic approach is often the best.
-Olaf

Hi Olaf & o_lampe,

Thanks for your explanation. Yes, the printer is for R & D purposes.
I shall attempt to do it.