Temperature error during contact of the tips

[Tomatendose]

Hello, I have the problem that although both tips are connected to the same GND, the tips affect each other when they touch. When the tips touch, one tip gets a negative or near zero temperature, the temperature seems to add up on the other tip. This causes the PID controller to heat one tip too high.

Can anyone reproduce this problem. Is it due to the ADS1118. I am using a PA120 tweezers. Have an attiny 3216 and matched the program.

[PaulusSmallus]

That is a weird problem, I have not come across this before. I would double check the wiring is correct. Maybe the positive and negative of one of the heaters is the wrong way round? I shall have a think.

[PaulusSmallus]

What settings do you use for the ADC? maybe the MUX is set wrong.

[Tomatendose]

#define ADS1118_SINGLE_SHOT_INTERNAL_TEMPERATURE 0x859B
#define ADS1118_SINGLE_SHOT_ADC 0x8BEB
#define ADS1118_SINGLE_SHOT_ADC_2 0xBBEB

[PaulusSmallus]

fyi, I just burnt out a C210 cartridge, so be careful with how much power you put through it.