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Temp logger

hnz1102·temp-logger·hardware/templogger.kicad_pcb

Temp logger PCB layout, top view — open source ESP32 board by hnz1102
Simulate this board

About the Temp logger PCB

Temp logger is an open source ESP32 PCB design by hnz1102, published on GitHub. It is a 2-layer board measuring 50 × 70 mm, with 52 components from 33 distinct parts.

Its main chip is the MCP73831-2-OT, from the ESP32 family. Other key parts include the ESP32-C3-WROOM-02-N4, MAX31855KASA, SPX3819M5-L and SSD1306_DISPLAY. By type, the board carries 17 resistors, 11 capacitors, 5 ICs, 5 switches, 5 diodes and 4 connectors.

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

From the project

Logging Thermocouple Temperature and Send Data to InfluxDB system.

This board provides a logging function that gets data on temperature from a K-type thermocouple.

Microcontroller on board - No need for a PC when you are measuring a temperature.

Transfer Temperature data via WiFi - This Logger can transfer temperature data to Linux PC via WiFi network and you can see the dashboard graph in influxDB.

Battery Powered - Using LiPo battery. It can run for 48 hours.

Temp logger, from the project README
From the project README

Main components on the Temp logger

MCP73831-2-OTESP32-C3-WROOM-02-N4MAX31855KASASPX3819M5-LSSD1306_DISPLAY

Temp logger bill of materials (BOM)

52 components, 33 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
MCP73831-2-OT
U101
1
ESP32-C3-WROOM-02-N4
U102
1
MAX31855KASA
U103
1
SPX3819M5-L
U104
1
SSD1306_DISPLAY
U105
1
2N7002K
Q101
1
IRF7606TRPBF
Q102
1
32.7680KHZ
32.7680KHz
Y102
1
CONN_K_TERM_XH_2P
Conn_K_TERM_XH_2P
J101
1
CONN_01X02
Conn_01x02
J102
1
USB_B_Mini
J103
1
455-1704
LiPo BATTERY Socket
J104
1
SOLDERJUMPER_2_OPEN
SolderJumper_2_Open
JP101
2
SW_Push_LED
SW101, SW102
1
BOOT TS-06104
SW103
1
RESET TS-06104
SW104
1
SLIDE_SW IS-1245T-G
SW105
3
511-1587-1
LED RED SML-E12V8WT86
D101, D102, D103
1
511-1585-1
LED GREEN SML-E12P8WT86
D104
1
NSR0340HT1G
D105
Show 13 more
QtyPartRefs
1
BK2125HS601-T
FB101
1
4.7UF
4.7uF
C101
2
1UF
1uF
C102, C108
3
0.1UF
0.1uF
C103, C106, C111
2
10UF
10uF
C104, C107
1
0.1UF
0.1uF
C105
2
16PF
16pF
C109, C110
6
330
R101, R102, R107, R110, R113, R114
5
10K
R103, R104, R109, R111, R118
3
13-RC0603FR-1320KL
20K 1%
R105, R108, R117
1
311-12.0KHR
12K 1%
R106
1
2K
R112
1
100K
R115

Temp logger design files

The KiCad project lives in the hnz1102/temp-logger repository on GitHub; these links point at the commit this page was built from.

Temp logger: common questions

What microcontroller does the Temp logger use?

The Temp logger is built around the MCP73831-2-OT, from the ESP32 family.

How big is the Temp logger PCB?

The Temp logger measures 50 × 70 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Temp logger?

52 components, from 33 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 Temp logger design files?

From the hnz1102/temp-logger 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 Temp logger design in my own project?

The repository has no license, so all rights stay with hnz1102. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Temp logger without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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