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Data logger v2

9 months ago 697
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Arduino Datalogger

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

front.jpg back.jpg

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:


Data logger v2

PCB_Data logger v2


ID Name Designator Footprint Quantity BOM_Manufacturer Part BOM_Manufacturer BOM_Supplier BOM_Supplier Part
1 CR2032-BS-6-1 B1 BAT-TH_CR2032-BS-6-1 1 CR2032-BS-6-1 Q&J LCSC C70377
2 20pF C1,C2 C0402 2 0402CG200J500NT FH LCSC C1554
3 10uF C3,C4 C0402 2 CL05A106MQ5NUNC SAMSUNG LCSC C15525
4 1uF C5,C7,C8,C10,C11 C0402 5 CL05A105KA5NQNC SAMSUNG LCSC C52923
5 100nF C6,C9,C12 C0402 3 CL05B104KO5NNNC SAMSUNG LCSC C1525
6 TF-15×15 CARD1 TF-SMD_TF-15-15 1 TF-15×15 SOFNG LCSC C111196
7 SS14 D1,D2 SMA_L4.4-W2.8-LS5.4-RD 2 SS14 MDD LCSC C2480
8 SPI J1 HDR-TH_6P-P2.54-V-R2-C3-S2.54 1 210S-2*3P L=11.6MMGold-plated black Ckmtw LCSC C124384
9 TX LED1 LED0603-R-RD 1 KT-0603R KENTO LCSC C2286
10 RX LED2 LED0603-R-RD 1 19-217/GHC-YR1S2/3T EVERLIGHT LCSC C72043
11 WS2812B-B LED3 LED-SMD_4P-L5.0-W5.0-TL_WS2812B-B 1 WS2812B-B Worldsemi LCSC C114586
12 10K R1 R0402 1 0402WGF1002TCE UniOhm LCSC C25744
13 5.1K R2,R3 R0402 2 0402WGF5101TCE UniOhm LCSC C25905
14 22 R4,R5 R0402 2 0402WGF220JTCE UniOhm LCSC C25092
15 75 R6,R7 R0402 2 0402WGF750JTCE UniOhm LCSC C25133
16 5.6K R9,R10 R0402 2 0402WGF5601TCE UniOhm LCSC C25908
17 HDC1080DMBR S1 HDC1080DMBR 1 HDC1080DMBR TI LCSC C82227
18 RST SW1 KEY-TH_4P-L4.5-W4.5-P3.00-LS5.8 1 TSA451G38-250 BRIGHT LCSC C294482
19 SS-12D03-G3 SW2 SW-TH_SS-12D03-G3 1 SS-12D03-G3 USAKRO LCSC C698224
20 ATMEGA32U4-MUR U1 VQFN-44_L7.0-W7.0-P0.50-BL-EP5.2 1 ATMEGA32U4-MUR MICROCHIP LCSC C45874
21 DS3231M+TRL U2 SOIC-16_L10.3-W7.5-P1.27-LS10.3-BL 1 DS3231M+TRL MAXIM LCSC C37663
22 AP2112K-3.3TRG1 U3 SOT-25-5_L3.0-W1.8-P0.95-LS3.0-BR 1 AP2112K-3.3TRG1 DIODES LCSC C51118
24 8MHz X1 OSC-SMD_L5.0-W3.2 1 X50328MSB2GI YXC LCSC C115962




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