HardLabs

Temperature sensors

askiiart·temperature-sensors

Temperature sensors PCB layout, top view — open source Nordic nRF board by askiiart

About the Temperature sensors PCB

Temperature sensors is an open source Nordic nRF PCB design by askiiart, published on GitHub. It is a 6-layer board measuring 45 × 48 mm, with 66 components from 45 distinct parts.

Its main chip is the nRF52840-QFXX, from the Nordic nRF family. Other key parts include the TP4057 and SN74LVC1G00DCK. By type, the board carries 23 capacitors, 12 resistors, 6 diodes, 5 inductors, 4 ICs and 4 connectors.

It belongs with the sensors and iot & wireless designs in this gallery.

From the project

Some futurely-Zigbee temperature sensors; I dislike the thermostat disagreeing with me, so I will make my own.

An nRF52840-based Zigbee temperature sensor for use with ESPHome, designed for peak battery efficiency.

I've gotten rather sick of my room being hot, meanwhile the thermostat is just across the wall, showing 5+ degrees cooler, even with my computer only idling. So instead of being "reasonable", I decided to make some temperature sensors so I could track it properly and figure out how to deal with the issue. Granted this is just a pretty boring temperature sensor, but what makes it unique is the lengths I went to for battery efficiency (while being reasonable, not compromising on features…

Temperature sensors, from the project README
From the project README

Main components on the Temperature sensors

nRF52840-QFXXTP4057SN74LVC1G00DCK

Temperature sensors bill of materials (BOM)

66 components, 45 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
nRF52840-QFXX
U1
1
TP4057
U2
1
~
U3
1
SN74LVC1G00DCK
U5
3
AO3401A
Q1, Q2, Q3
1
32MHz
Y1
1
32.768kHz
Y2
2
Conn_01x03
J1, J4
1
USB_C_Receptacle_PowerOnly_6P
J2
1
Conn_01x02
J3
1
Antenna_Chip
AE1
1
SW_Push
SW1
1
SW_SPST
SW2
1
Thermistor_NTC
TH1
1
Thermistor_NTC
TH2
1
Thermistor_NTC
TH3
1
Thermistor_NTC
TH4
2
LED
D1, D2
2
D_Small
D3, D4
2
D
D6, D7
Show 25 more
QtyPartRefs
1
4.7nH
L1
1
2.2nH
L2
1
10uH
L3
1
15nH
L4
1
1.5uH
L5
1
1.0pF
C1
1
1.2pF
C2
2
20pF
C3, C4
3
10uF
C5, C18, C23
2
1.0uF
C6, C9
2
100pF
C7, C15
1
DNP
C8
1
47nF
C10
5
100nF
C11, C12, C13, C14, C19
2
15pF
C16, C17
1
100uF
C20
1
1nF
C21
1
10pF
C22
3
1M
R1, R7, R12
2
10k
R2, R3
2
5.1k
R4, R5
1
100k
R6
2
300
R8, R9
1
560k
R10
1
180k
R11

Temperature sensors design files

The KiCad project lives in the askiiart/temperature-sensors repository on GitHub; these links point at the commit this page was built from.

Temperature sensors: common questions

What microcontroller does the Temperature sensors use?

The Temperature sensors is built around the nRF52840-QFXX, from the Nordic nRF family.

How big is the Temperature sensors PCB?

The Temperature sensors measures 45 × 48 mm, has 6 copper layers and is 1.6 mm thick.

How many components are on the Temperature sensors?

66 components, from 45 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Temperature sensors design files?

From the askiiart/temperature-sensors repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Temperature sensors design in my own project?

The repository has no license, so all rights stay with askiiart. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Temperature sensors without the hardware?

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

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