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PCBbot

halherta·PCBbot

PCBbot PCB layout, top view — open source ESP32 board by halherta

About the PCBbot PCB

PCBbot is an open source ESP32 PCB design by halherta, published on GitHub under the MIT license. It is a 2-layer board measuring 140 × 120 mm, with 60 components from 46 distinct parts.

Its main chip is the ESP32-S3-DevKitC, from the ESP32 family. Other key parts include the LM1117MP-3.3, TCRT5000, SN754410NE, HC-SR04 and AP1509-50SG-13. By type, the board carries 20 test points, 10 ICs, 10 resistors, 8 capacitors, 4 diodes and 3 connectors.

From the project

The PCBBot leverages the PCB itself as the chassis. This reduces cost significantly. It also means that the two motors and the caster wheel would have to be mounted on the PCB itself, in addition to the batteries and all the other components...

The PCBBot leverages the PCB itself as the chassis. This reduces cost significantly. It also means that the two motors and the caster wheel would have to be mounted on the PCB itself, in addition to the batteries and all the other components...

For more info have a look at the write up on my blog entry

In this Github repo, you'll find my PCBBot KiCAD PCB design freely available (MIT License) along with a Digikey bill of materials (BOM) (caster wheel, motor brackets and motors not included) and MicroPython code. I’m also providing my custom symbol and footprint libraries in this repo. Feel…

PCBbot, from the project README
From the project README

Main components on the PCBbot

LM1117MP-3.3TCRT5000SN754410NEESP32-S3-DevKitCHC-SR04AP1509-50SG-13

PCBbot bill of materials (BOM)

60 components, 46 distinct parts.

QtyPartRefs
1
LM1117MP-3.3
U2
4
TCRT5000
U3, U4, U5, U6
1
SN754410NE
U7
1
ESP32-S3-DevKitC
U8
2
HC-SR04
U9, U10
1
AP1509-50SG-13
U11
1
TSM480P06
Q1
2
n20motorenc
J2, J3
1
Castor Wheel
J4
2
Battery_Cell
BT1, BT2
1
SW_Push_SPDT
SW1
1
VCC
TP1
1
GND
TP2
1
SENS_AN0
TP3
1
SENS_AN1
TP4
1
SENS_AN2
TP5
1
SENS_AN3
TP6
1
ENC1A
TP7
1
ENC1B
TP8
1
ENC2A
TP9
Show 26 more
QtyPartRefs
1
ENC2B
TP10
1
TRIG1
TP11
1
ECHO1
TP12
1
TRIG2
TP13
1
ECHO2
TP14
1
MOT2_EN
TP15
1
MOT2_A
TP16
1
MOT2_B
TP17
1
MOT1_EN
TP18
1
MOT1_A
TP19
1
MOT1_B
TP20
1
LED
D1
1
1N5822
D2
1
1N5817
D3
1
1N47xxA
D4
1
47u
L1
1
470u
C1
1
10u
C2
3
1u
C3, C4, C5
2
10n
C6, C7
1
330u
C10
1
100k
R1
1
470
R2
3
150
R3, R7, R9
4
10k
R4, R6, R8, R10
1
100
R5

PCBbot design files

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

PCBbot: common questions

What microcontroller does the PCBbot use?

The PCBbot is built around the ESP32-S3-DevKitC, from the ESP32 family.

How big is the PCBbot PCB?

The PCBbot measures 140 × 120 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the PCBbot?

60 components, from 46 distinct parts. The full bill of materials is listed on this page.

Where can I download the PCBbot design files?

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

Can I use the PCBbot design in my own project?

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

Can I test firmware for the PCBbot without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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