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Precision-Thermistor-Thermometer

WarwickBrown·Precision-Thermistor-Thermometer·hardware/ADS1115BasicDesign.kicad_sch

Precision-Thermistor-Thermometer

About the Precision-Thermistor-Thermometer PCB

Precision-Thermistor-Thermometer is an open source RP2040/RP2350 PCB design by WarwickBrown, published on GitHub under the MIT license. It is a board, with 26 components from 11 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. Other key parts include the ADS1115IDGS. By type, the board carries 6 resistors, 3 connectors, 2 ICs and 2 capacitors.

It belongs with the sensors and test & measurement designs in this gallery.

From the project

Precision Thermistor based Thermometer for use in a fibre based reservoir computer for Optical AI based applications.

A two-channel, sub-millikelvin-class temperature measurement and logging instrument built around a Raspberry Pi Pico W and a 16-bit ADS1115 ADC, using matched 100 kΩ NTC thermistors in differential Wheatstone half-bridges.

It was developed as the instrumentation for a passively temperature-stabilised enclosure used in a photonic reservoir-computing experiment. In that experiment a multimode fibre acts as the nonlinear mixing medium, and its refractive index (and therefore the computation it performs) is temperature-sensitive. Characterising and controlling that thermal environment is what…

Main components on the Precision-Thermistor-Thermometer

ADS1115IDGSPico

Precision-Thermistor-Thermometer bill of materials (BOM)

26 components, 11 distinct parts.

QtyPartRefs
1
ADS1115IDGS
U1
1
Pico
U2
3
AudioJack3
J1, J2, J3
4
10nF
C_cm1, C_cm2, C_cm3, C_cm4
2
100nF
C_diff1, C_diff2
4
1k 1%
R_filt1, R_filt2, R_filt3, R_filt4
1
4.7k 5%
R_pu1
2
100k
TH1, TH2
1
100n
C1
1
10u
C2
6
100k 0.1%
R1, R2, R3, R4, R5, R6

Precision-Thermistor-Thermometer design files

The KiCad project lives in the WarwickBrown/Precision-Thermistor-Thermometer repository on GitHub; these links point at the commit this page was built from.

Precision-Thermistor-Thermometer: common questions

What microcontroller does the Precision-Thermistor-Thermometer use?

The Precision-Thermistor-Thermometer is built around the Pico, from the RP2040/RP2350 family.

How many components are on the Precision-Thermistor-Thermometer?

26 components, from 11 distinct parts. The full bill of materials is listed on this page.

Where can I download the Precision-Thermistor-Thermometer design files?

From the WarwickBrown/Precision-Thermistor-Thermometer repository on GitHub, which has the schematic; the links under Design files point to each one.

Can I use the Precision-Thermistor-Thermometer design in my own project?

Yes, under the terms of its MIT license, which WarwickBrown chose for the repository.

Can I test firmware for the Precision-Thermistor-Thermometer without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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