Home

Thermostat is 2-channel temperature controller

Overview

• Channel count: 2
• Sensor: 10k NTC thermistors read by AD7172-2 ADC
• Load (heater/TEC) drive: up to 8W (+/-2A with 4V compliance) from MAX1968 drivers
• Form factor: 3U module or stand-alone enclosure (Hammond 1455C1202).
• Output connectors: Sensor and load connect via terminal block connector on the stand-alone enclosure version or via internal 100mil pin-header on the 3U version (can be broken out to a separate front panel with 2xD9, such as Schroff 30849-750).
• Programming interface: Ethernet via RJ45 connector on the front panel
• Indicators 4 front panel LEDs
• Power supply: +12V DC (1.5A max) supplied either by a front-panel barrel connector, PoE (up to 30W), internal 100mils pin-header, or rear Molex connector (3U version only).
• Microprocessor: STM332F427ZI

Firmware

M-Labs repository

Previous Versions

Thermostat_Thorlabs: Based on a Thorlabs temperature control module. The Thorlabs module has a poor tempco and can't drive resistive heaters so this board was designed as a higher-performing alternative (see issue #4).
Thermostat v1: Prototype version based on a different microprocessor

Photos

2 channel 3U version

Note this is photo of v1 - needs updating

2 channel stand-alone version

Enclosure is Hammond PN 1455C1202