HardLabs

Walter

jochenalt·Walter·schematics/BotCortex/BotCortex.kicad_pcb

Walter PCB layout, top view — open source NXP board by jochenalt

About the Walter PCB

Walter is an open source NXP PCB design by jochenalt, published on GitHub. It is a 2-layer board measuring 154.9 × 71.1 mm, with 60 components from 46 distinct parts.

Its main chip is the Teensy_3.5, from the NXP family. Other key parts include the 7805 and LM7809ACT. By type, the board carries 26 connectors, 12 capacitors, 5 resistors, 4 ICs, 3 diodes and 2 transistors.

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

From the project

6DOF Industrial Robot, vintage style

Walter, from the project README
From the project README

Main components on the Walter

7805LM7809ACTTeensy_3.5

Walter bill of materials (BOM)

60 components, 46 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
7805
U1
2
LM7809ACT
U2, U3
1
Teensy_3.5
U4
2
BC237
Q1, Q2
1
2x Serial
P1
1
Herkulex Servo
P2
1
Encoder Socket 1
P3
1
Encoder Socket 0
P4
1
Stepper Elbow
P5
1
Power In uC Servo 9V
P6
1
Power Out uC Servo
P7
1
Stepper Forearm
P8
1
Stepper Wrist
P9
1
Stepper Upperarm
P10
1
Stepper Hip
P11
1
POWER_IN
P12
1
PowerEnableIn
P13
1
Power Stepper 2
P14
1
Power Stepper 3
P15
1
Power Stepper 4
P16
Show 26 more
QtyPartRefs
1
PowerEnableOut
P17
1
Power Stepper 5
P18
1
Thermal Printer 5V
P19
1
POTI 10K
P20
1
Reset_Conn
P21
1
Reset Conn
P22
1
LED-Driver-I2C
P23
1
Thermal_Printer
P25
1
Reset Anschluss
P26
1
Power Stepper 1
P28
4
R
1.2K1, 1.2K2, 1.2k1, 1.2k2
1
FUSE
F1
2
Relay_1xON
REL1, REL2
1
reset
SW2
2
Diode
D1, D10
1
1N5822
D5
1
47uF
C1
5
100nF
C2, C6, C12, C14, C16
1
220uF
C3
2
10uF
C4, C5
1
47uF
C7
1
2200uF
C11
1
1000uF
C13
1
220
R1
2
120
R5, R6
2
1K
R8, R10

Walter design files

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

Walter: common questions

What microcontroller does the Walter use?

The Walter is built around the Teensy_3.5, from the NXP family.

How big is the Walter PCB?

The Walter measures 154.9 × 71.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Walter?

60 components, from 46 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Walter design files?

From the jochenalt/Walter repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Walter design in my own project?

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

Can I test firmware for the Walter 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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