This document describes a temperature sensor readout circuit for a MEMS-based microheater array. A platinum microheater is fabricated on an SOI wafer and achieves temperatures of 200°C with uniform distribution using 20mW of power. An NTC thermistor is used as the temperature sensor and connected to the microheater in a Wheatstone bridge circuit to linearly measure the temperature changes. The circuit operates at low power, accurately measures temperature close to the microheater, and is well-suited for applications such as gas sensors.