So, as far as the PT100 amplifier (If you bought the kit with board from Tim, it will have the parts you need) goes, it needs 3 lines in. 5V reference (I used a line off my PSU, which even with an aftermarket Corsair unit was slightly unstable with no other load, so I added a USB port to charge crud with to keep the 5V steady, but it's better practice to use Vref off the Rambo.), Signal ground, and signal. That matters. What I would do is take the end off a 3 pin computer fan tail, and wire to that, so it connects to the headers, or use a 3 pin Molex 2.54MM pitch shell (Which is pretty much what the other one is), if you have those or a mouser/digikey order going soon. On the other end, you'll need to wire to the following pins in the expansion header on the RAMBO:
Don't connect anything live. Please.
5V: Analog pin one. As the rambo sits stock (that is, power on the right, and stepper connections on the bottom), you want the lower left most pin for that in the analog header (Right below one of the pin headers for the LCD, and next to thermistor 0 input)
Sig Ground: Analog pin 2. Just above Analog pin one.
Signal: Analog pin 3. To the right on pin one. Lower row.
It will be a tight squeeze getting the signal ground into place. Be careful with it, and don't try to use a different ground. It does matter. They do fit in place there. Be sure to use proper female crimp pins in receptacles (I used single pin receptacles).
Next step. Open the Repetier firmware, and go to pins.h. Find the following line in the Rambo pin assignments (Mine is around line 1483, but yours may not be).
Change the last number to a 6. That tells it to look for the signal on analog EXT 3, which is where we plugged it in just moments ago.#define TEMP_0_PIN 0
Next, open config.h and check to see if your version of Repetier supports PT100's out of the box (It may not. Mine didn't, but if it does, it's a newer version, and it's better to use their table or method if it's available). If not, change the line
to 6.#define EXT0_TEMPSENSOR_TYPE
Then find
Go ahead and paste the following in#define NUM_TEMPS_USERTHERMISTOR1
Spoiler:
That table worked for me, and was reformatted from Marlin's table, which is what E3D recommended using. I make no guarantees about the accuracy, but it didn't set my printer or house on fire. If you get a crazy value on the temp sensor, it's likely that you got signal and sig-ground backwards (I did it. Yay! Doesn't hurt anything)
Hopefully it goes well, and happy printing.
