HardLabs

TermoHumi

LinJesUxUs·TermoHumi·KiCad/TermoHumi/TermoHumi.kicad_pcb

TermoHumi PCB layout, top view — open source AVR/Arduino board by LinJesUxUs

About the TermoHumi PCB

TermoHumi is an open source AVR/Arduino PCB design by LinJesUxUs, published on GitHub. It is a 2-layer board measuring 60.1 × 20.1 mm, with 91 components from 26 distinct parts.

Its main chip is the ATmega8L-8A, from the AVR/Arduino family. Other key parts include the AHT10 and MCP73831. By type, the board carries 36 diodes, 29 resistors, 8 connectors, 6 transistors, 5 capacitors and 3 ICs.

It belongs with the sensors and displays & leds designs in this gallery.

From the project

Thermo-hygrometer code, powered on ATMega, AHT10 sensor and 7 Segment Display.

Thermo-hygrometer code, powered on ATMega, AHT10 sensor and 7 Segment Display.

TermoHumi is a compact embedded firmware project for an ATmega8 microcontroller that reads temperature and humidity from an AHT10 sensor and displays the values on a multiplexed 4-digit 7-segment LED display. The display alternates between temperature (°C) and relative humidity (%) every few seconds.

Main components on the TermoHumi

ATmega8L-8AAHT10MCP73831

TermoHumi bill of materials (BOM)

91 components, 26 distinct parts.

QtyPartRefs
1
ATmega8L-8A
U1
1
AHT10
U2
1
MCP73831
U4
6
AO3401A
Q1, Q2, Q3, Q4, Q5, Q8
1
AVR-ISP-10
J2
1
USB
J3
6
Conn_01x04_Socket
J7, J8, J9, J10, J11, J12
1
Battery_Cell
BT1
2
500mA
F1, F2
1
SW_Push
SW3
32
LED
D1, D2, D3, D4, D5, D6, D7, D8 +24
1
RED
D29
3
1N4148WS
D35, D36, D37
1
1nF
C3
2
10uF
C4, C5
2
4.7uF
C6, C7
5
100
R1, R2, R3, R4, R5
6
10k
R6, R7, R8, R9, R10, R30
8
220
R11, R16, R17, R18, R19, R20, R21, R25
1
1M
R12
Show 6 more
QtyPartRefs
2
5.1k
R13, R24
1
RPROG
R14
3
1k
R15, R29, R31
1
0
R22
1
100k
R26
1
33k
R33

TermoHumi design files

The KiCad project lives in the LinJesUxUs/TermoHumi repository on GitHub; these links point at the commit this page was built from.

TermoHumi: common questions

What microcontroller does the TermoHumi use?

The TermoHumi is built around the ATmega8L-8A, from the AVR/Arduino family.

How big is the TermoHumi PCB?

The TermoHumi measures 60.1 × 20.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the TermoHumi?

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

Where can I download the TermoHumi design files?

From the LinJesUxUs/TermoHumi repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the TermoHumi design in my own project?

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

Can I test firmware for the TermoHumi without the hardware?

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

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