/diy/ - Do It Yourself

>>1481109
>How peopel usually measure temperature with diodes or bjts?
Option 1: feed the diode/transistor with constant current (resistor from power source, if you're lazy), assume the voltage across the diode is offset + temperature dependent part. Pic related. It is/was popular in diy thermometers using display-driving ADCs like ICL710x.
Option 2: use one switched and one fixed current source. Measure the voltage across the diode with two currents. There are ready-made chips with an internal ADC and all for doing this, like LM86. It is used in conjunction with big ICs with built-in temperature sensing diodes.

But usually people buy their bandgap temperature sensors ready-made. Or use sensors based on some totally different principle.