HardLabs

Steve v3

Marcus10110·steve-v3·BarBot3/BarBot3.kicad_pcb

Steve v3 PCB layout, top view — open source AVR/Arduino board by Marcus10110

About the Steve v3 PCB

Steve v3 is an open source AVR/Arduino PCB design by Marcus10110, published on GitHub. It is a board measuring 88.9 × 94.6 mm, with 102 components from 22 distinct parts.

Its main chip is the ATmega32U4RC-AU, from the AVR/Arduino family. Other key parts include the LM2594M-3.3 and MCP23008-xSO. By type, the board carries 32 resistors, 27 connectors, 24 transistors, 8 capacitors, 5 ICs and 2 diodes.

It belongs with the robotics & motion designs in this gallery.

From the project

Steve the bartending robot, PCB Rev 3

Steve the bartending robot is a robotic drink maker, capable of dispensing 24 different liquids for mixing cocktails.

The schematics and layout were created with KiCad

The board can also be ordered directly from OSHPARK here.

The bill of materials for the PCB, pumps, and wire harness for the pumps is available on octopart here.

The design also requires a 12V, 4A+ power supply with a 5.5x2.1mm barrel jack, and a USB-C cable, for USB 2.0 data.

Main components on the Steve v3

LM2594M-3.3ATmega32U4RC-AUMCP23008-xSO

Steve v3 bill of materials (BOM)

102 components, 22 distinct parts.

QtyPartRefs
1
LM2594M-3.3
U1
1
ATmega32U4RC-AU
U2
3
MCP23008-xSO
U3, U4, U5
24
BSS214NW
Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +16
1
Crystal
Y1
1
USB_C_Receptacle_USB2.0
J1
1
AVR-ISP-6
J2
24
Conn_01x02
J3, J4, J5, J6, J7, J8, J9, J10 +16
1
Barrel_Jack_Switch
J27
1
Fuse
F1
1
SW_Push
SW1
1
B130-E3
D1
1
LED
D2
1
150uH
L1
1
100uF
C1
1
220uF
C2
2
22pF
C3, C4
4
1uF
C5, C6, C7, C8
4
5.1K
R1, R2, R6, R7
2
22
R3, R4
Show 2 more
QtyPartRefs
25
10K
R5, R9, R10, R11, R12, R13, R14, R15 +17
1
1K
R8

Steve v3 design files

The KiCad project lives in the Marcus10110/steve-v3 repository on GitHub; these links point at the commit this page was built from.

Steve v3: common questions

What microcontroller does the Steve v3 use?

The Steve v3 is built around the ATmega32U4RC-AU, from the AVR/Arduino family.

How big is the Steve v3 PCB?

The Steve v3 measures 88.9 × 94.6 mm and is 1.6002 mm thick.

How many components are on the Steve v3?

102 components, from 22 distinct parts. The full bill of materials is listed on this page.

Where can I download the Steve v3 design files?

From the Marcus10110/steve-v3 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Steve v3 design in my own project?

The repository has no license, so all rights stay with Marcus10110. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Steve v3 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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