HardLabs

Head

jsvana·coffeetron·hardware/head/head.kicad_pcb

Head PCB layout, top view — open source NXP board by jsvana

About the Head PCB

Head is an open source NXP PCB design by jsvana, published on GitHub under the MIT license. It is a 2-layer board measuring 73 × 43.8 mm, with 41 components from 20 distinct parts.

Its main chip is the Teensy4.0, from the NXP family. Other key parts include the INA126. By type, the board carries 15 resistors, 12 capacitors, 9 connectors, 4 ICs and 1 transistor.

From the project

Arduino sketch to pour a shot of espresso in a Gaggia Classic Pro to a specific weight.

Arduino sketch to pour a shot of espresso in a Gaggia Classic Pro to a specific weight.

Fun side project. Probably does things wrong, and isn't really useful unless you have the same setup I do. Feel free to use as a reference if you want!

Head, from the project README
From the project README

Main components on the Head

Teensy4.0INA126

Head bill of materials (BOM)

41 components, 20 distinct parts.

QtyPartRefs
1
Teensy4.0
U1
3
INA126
U3, U4, U5
1
IRF540N
Q1
1
Stats_Button
J2
1
Flush_Button
J3
1
Brew_Button
J4
1
Temp_Ok
J5
1
Display
J6
1
Load_Cell
J7
1
Rotary_Encoder
J8
1
Heater_Active
J9
1
Pump_Active
J10
6
1nF
C4, C6, C7, C9, C10, C12
3
10nF
C5, C8, C11
3
0.1uF
C13, C14, C15
3
220
R1, R2, R3
6
10k
R4, R5, R7, R8, R10, R11
3
1M
R6, R9, R12
1
650
R13
2
400
R14, R15

Head design files

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

Head: common questions

What microcontroller does the Head use?

The Head is built around the Teensy4.0, from the NXP family.

How big is the Head PCB?

The Head measures 73 × 43.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Head?

41 components, from 20 distinct parts. The full bill of materials is listed on this page.

Where can I download the Head design files?

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

Can I use the Head design in my own project?

Yes, under the terms of its MIT license, which jsvana chose for the repository.

Can I test firmware for the Head without the hardware?

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

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