Get the PCB and on it we have a space for a USB type C charger. To make precise measurements, I’ve added a 16 bits ADC module. On the front we have the pins for an OLED display so we could see the measurements. It also has two push buttons. Then, we have a space for a buzzer for sound notifications. We have space for an NTC on board so we could measure the ambient temperature. But then we have two pins for yet another NTC that would go on a heat dissipator. Then we have the input from a Peltier cell and also the output for a fan like this one but I might not use it for today. Last pins are for the battery and the on and off switch which in my case I will use one like this one and a small 3.7V lipo battery. And by the way, I’ve took some time and designed an enclosure as well so we need to 3D print it and the files are below as always.