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Std EditionData logger v2

Profile:Custom Arduino-based temperature and humidity data logger.

License: MIT

Published Time:2021-03-18 14:33:14
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Arduino Datalogger

A custom data logger based on ATmega32u4 with a custom PCB.


The device features the following main components:

  • Atmel ATmega32u4 MCU
  • Texas Instruments HDC1080 temperature and humidity sensor
  • Maxim DS3231 RTC
  • WS2812B RGB LED
  • microSD card reader
  • battery holder for CR2032 coin cell

The coin cell was initially intended for powering the RTC as well as the MCU, but it turns out the SD card doesn't work with the battery voltage. As such, the 3-positions switch is omitted and the device needs power from the USB port (e.g. with power-bank). The battery is used for keeping the RTC settings in any case.


Code repository: https://github.com/beeb/ArduinoDatalogger


Data logger v2

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PCB_Data logger v2

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ID Name Designator Footprint Quantity BOM_Supplier BOM_Manufacturer BOM_Manufacturer Part BOM_Supplier Part
1 22 R4,R5 R0402 2 LCSC UniOhm 0402WGF220JTCE C25092
2 8MHz X1 OSC-SMD_L5.0-W3.2 1 LCSC YXC X50328MSB2GI C115962
3 20pF C1,C2 C0402 2 LCSC FH 0402CG200J500NT C1554
4 SS14 D1,D2 SMA_L4.4-W2.8-LS5.4-RD 2 LCSC MDD SS14 C2480
5 WS2812B-B LED3 LED-SMD_4P-L5.0-W5.0-TL_WS2812B-B 1 LCSC Worldsemi WS2812B-B C114586
6 10K R1 R0402 1 LCSC UniOhm 0402WGF1002TCE C25744
7 5.6K R9,R10 R0402 2 LCSC UniOhm 0402WGF5601TCE C25908
8 5.1K R2,R3 R0402 2 LCSC UniOhm 0402WGF5101TCE C25905
9 RST SW1 KEY-TH_4P-L4.5-W4.5-P3.00-LS5.8 1 LCSC BRIGHT TSA451G38-250 C294482
10 CR2032-BS-6-1 B1 BAT-TH_CR2032-BS-6-1 1 LCSC Q&J CR2032-BS-6-1 C70377
11 SPI J1 HDR-TH_6P-P2.54-V-R2-C3-S2.54 1 LCSC Ckmtw 210S-2*3P L=11.6MMGold-plated black C124384
12 RX LED2 LED0603-R-RD 1 LCSC EVERLIGHT 19-217/GHC-YR1S2/3T C72043
14 TX LED1 LED0603-R-RD 1 LCSC KENTO KT-0603R C2286
15 ATMEGA32U4-MUR U1 VQFN-44_L7.0-W7.0-P0.50-BL-EP5.2 1 LCSC MICROCHIP ATMEGA32U4-MUR C45874
16 10uF C3,C4 C0402 2 LCSC SAMSUNG CL05A106MQ5NUNC C15525
17 HDC1080DMBR S1 HDC1080DMBR 1 LCSC TI HDC1080DMBR C82227
18 1uF C5,C7,C8,C10,C11 C0402 5 LCSC SAMSUNG CL05A105KA5NQNC C52923
19 100nF C6,C9,C12 C0402 3 LCSC SAMSUNG CL05B104KO5NNNC C1525
20 75 R6,R7 R0402 2 LCSC UniOhm 0402WGF750JTCE C25133
21 SS-12D03-G3 SW2 SW-TH_SS-12D03-G3 1 LCSC USAKRO SS-12D03-G3 C698224
22 AP2112K-3.3TRG1 U3 SOT-25-5_L3.0-W1.8-P0.95-LS3.0-BR 1 LCSC DIODES AP2112K-3.3TRG1 C51118
23 TF-15×15 CARD1 TF-SMD_TF-15-15 1 LCSC SOFNG TF-15×15 C111196
24 DS3231M+TRL U2 SOIC-16_L10.3-W7.5-P1.27-LS10.3-BL 1 LCSC MAXIM DS3231M+TRL C37663


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