NTC readings at six temperatures

by VladM

13 parts

Six thermistor dividers off one 3.3 V reference. Each branch is a 10 kΩ pull-up over an NTC thermistor (R25 = 10 kΩ, β = 3435 K) set to its own temperature, so the six probes show what an ADC pin would read at 84, 57, 25, 6, −10 and −25 °C.

• V1 3.3V
• R1 10kΩ
• TH1 10kΩ@84°C
• R2 10kΩ
• TH2 10kΩ@57°C
• R3 10kΩ
• TH3 10kΩ@25°C
• R4 10kΩ
• TH4 10kΩ@6°C
• R5 10kΩ
• TH5 10kΩ@-10°C
• R6 10kΩ
• TH6 10kΩ@-25°C