HardLabs

Hvac

candykingdom·hvac

Hvac PCB layout, top view — open source AVR/Arduino board by candykingdom

About the Hvac PCB

Hvac is an open source AVR/Arduino PCB design by candykingdom, published on GitHub. It is a 2-layer board measuring 76.5 × 99 mm, with 48 components from 25 distinct parts.

Its main chip is the ATMEGA328P-A, from the AVR/Arduino family. Other key parts include the MIC5225 and MOSFET_N. By type, the board carries 19 resistors, 5 ICs, 5 diodes, 5 capacitors, 3 switches and 2 jumpers.

From the project

You have to install the board type "atmega328 on a breadboard". Follow the instructions in Minimal Circuit (Eliminating the External Clock)

You have to install the board type "atmega328 on a breadboard". Follow the instructions in Minimal Circuit (Eliminating the External Clock)

For a 10 foot run @ 12v 4A, allowing for 3% voltage drop.

Wire Size 14 AWG Voltage at Max Drop 11.64 V

Motors: Board Side Cable Side # Find the cable side version * Same crimps

Through hole potentiometer Through hole toggle switch Pushbutton Switch (PVA-H2) MOSFET * Fuseholder

Main components on the Hvac

ATMEGA328P-AMIC5225MOSFET_N

Hvac bill of materials (BOM)

48 components, 25 distinct parts.

QtyPartRefs
1
ATMEGA328P-A
IC1
1
MIC5225
U1
3
MOSFET_N
U2, U3, U4
1
POWER_INPUT
J3
1
SPST
BTN1
1
POWER_FUSE
F1
4
hole
H1, H2, H3, H4
1
PINHD-1X6
JP1
1
PINHD-1X9
JP2
2
POT
RV1, RV2
3
SPST
SW1, SW2, SW3
2
RED
D1, D5
1
YELLOW
D2
1
GREEN
D3
1
BLUE
D4
1
.1uF
C1
2
0.1uF
C2, C3
1
1.0uF
C4
1
2.2uF
C5
6
10k
R1, R3, R4, R10, R11, R12
Show 5 more
QtyPartRefs
3
4.7k
R2, R18, R19
4
2.2k
R5, R6, R7, R9
1
3.3k
R8
3
220
R13, R14, R15
2
1k
R16, R17

Hvac design files

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

Hvac: common questions

What microcontroller does the Hvac use?

The Hvac is built around the ATMEGA328P-A, from the AVR/Arduino family.

How big is the Hvac PCB?

The Hvac measures 76.5 × 99 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Hvac?

48 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the Hvac design files?

From the candykingdom/hvac repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Hvac design in my own project?

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

Can I test firmware for the Hvac 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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