An accurate and flexible four-channel temperature sensor designed for makers and engineers
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README.md

SenseTemp

Designed by Capable Robot Components.
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SenseTemp is available on CrowdSupply. Please visit the campaign page for product information and to purchase SenseTemp.

SenseTemp PCB Image

SenseTemp provides four highly accurate and flexible temperature sensors which allow you to understand the operation of your:

  • Mobile robot
  • Embedded system
  • Double pane windows on your house
  • Home brewing operation
  • Or any other system where temperature and thermal conduction is important

It's designed for quick tests as well as long-duration process monitoring.

SenseTemp Features

  • Small: so that it can be on a mobile system being tested. The RTDs themselves are 2 mm x 4 mm, making them thermally responsive and great for measurement of point heat sources
  • Inexpensive: allowing many points of temperature monitoring
  • Battery Powered: including LiPoly & USB power banks
  • Wireless: to make test setup faster and more flexible
  • Open Software: so that the device can directly feed data into a data logging system of your choice
  • Open Hardware: to enable derivative designs and for easy hacking

Specifications

Feature Specification
Sensors 4x Platinum resistance temperature detectors (RTDs)
RTD Accuracy ±0.15°C
Temperature Range -50°C to 260°C
Interface ICs 4x MAX31865 with 4 wire sensing
Form Factor Adafruit Feather
Dimensions 0.9" x 2.4"

Feather Hosts

SenseTemp is designed to mate with Adafruit Feather-compatible host modules, like:

Note that the ES8266 Feather is NOT supported due to the limited IO on the ESP8266. It does not have enough pins to support the four SPI devices of the SenseTemp.

Software

The software running on the Feather host processor does change based on the feather host you are using. This repository contains software for:

  • CircuitPython: if you are using a Cortex M4 or M0 Feather.
  • MicroPython: if you are using an ESP32 Feather. The ESP32 is not currently supported by CircuitPython.

Hardware Revisions

  • CREAES : Last release 2018-10-18.
    • Changed from 0805 to 0603 passive components.
    • Moved all components to top side of PCB.
    • Added USR pin for user-controllable LED near the RTD connector.
    • Changed license from CC BY-SA 4.0 to CERN OHL v1.2.
    • IN PROGRESS : Can be powered from either USB or Li-Ion sources.
  • X9EG : Released 2018-08-28.
    • Added SIO pin with AT21CS01 1-Wire EEPROM for configuration & serialization.
    • Added EN pin to allow host PCB to disable 5v to 3v regulator on this PCB.
    • Changed RTD connector from 20 pin (used on XTMT version) to 16 pin.
  • XTMT : Initial version released 2018-05-18.

License Information

Type License
Hardware Copyright Capable Robot Components 2018

This documentation describes Open Hardware and is licensed under the CERN OHL v1.2 or later.

You may redistribute and modify this documentation under the terms of the CERN OHL v.1.2. This documentation is distributed WITHOUT ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING OF MERCHANTABILITY, SATISFACTORY QUALITY AND FITNESS FOR A PARTICULAR PURPOSE. Please see the CERN OHL v.1.2 for applicable conditions
Software MIT License
Documentation Creative Commons Attribution-ShareAlike License

More detailed information about the CERN License is available in the license folder and on the CERN website.

OSHW Certification
OSHW Mark US000151
Certified open source hardware by the Open Source Hardware Association