The issue is most 3.3 volt 32-bit controller chips are only 5 volt signal tolerant on their digital pins. Placing more than 3.3 volts on an analog pin will damage the chip. You may be able to limit the PT100 amplifier output signal’s voltage to a max of 3.3 volts by using a moderate resistance in series resistor (60 to 100 ohms 1/4watt) on the 5 volt powered PT100 amplifier signal output to limit the output current with a small signal diode (e.g. a 1N914) connected to the resistor’s other pin in reverse biased fashion to the 3.3 volt supply of your 32-bit controller board. A 60 ohm resistor should limit any current from the PT100 signal output at 5V to the 3.3V supply via the diode to 20 mA protecting your 32 bit electronics.
Either the text or the picture need to be corrected.
The example picture says that a resistance 5.2 ohms is ok for a 24v heater cartridge at 30 watts (due to the blue insulated wires shown).
However the text contradicts this for 24v heater cartridge saying that the resistance of a 24v 40 watt heater cart should be about 14.4 ohms or about 19.2 ohms for a 24v 30 watt cart.
The 4.8 ohm resistance of a 12 volt 30 watt heater cart in the text is a closer match to the 5.2 ohms in the picture!
It would be helpful if there was a link to your example replacement X carriage for Prusa i3’s having the required x carriage 45mm Rod Spacing, LM8UU bearings and ~15mm Belt Spacing.
Either the text or the picture need to be corrected.
The example picture says that a resistance 5.2 ohms is ok for a 24v heater cartridge at 30 watts (due to the blue insulated wires shown).
However the text contradicts this for 24v heater cartridge saying that the resistance of a 24v 40 watt heater cart should be about 14.4 ohms or about 19.2 ohms for a 24v 30 watt cart.
The 4.8 ohm resistance of a 12 volt 30 watt heater cart in the text is a closer match to the 5.2 ohms in the picture!
It would be helpful if there was a link to your example replacement X carriage for Prusa i3’s having the required x carriage 45mm Rod Spacing, LM8UU bearings and ~15mm Belt Spacing.