2 layers

Speedometer Arduino Nano

Q: What parts does the Speedometer Arduino Nano use?

13 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Q: Where can I download the Speedometer Arduino Nano KiCad files?

From the Brawn1/Speedometer repository on GitHub, at the commit this page was made from: the board is Kicad/speedometer_Arduino_Nano/speedometer_Arduino_Nano.kicad_pcb and its schematic Kicad/speedometer_Arduino_Nano/speedometer_Arduino_Nano.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Q: Can I use the Speedometer Arduino Nano design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Brawn1/Speedometer

Arduino based Speed Meter for Hotweels Cars

Open in PCBKit

Copper layers: 2
Thickness: 1.6 mm
Parts: 13
Nets: 34
Pads: 61
Tracks, vias: 0, 0
Routed: Not yet
KiCad: KiCad 8.0 (file 20240108)
Created: 9 Jan 2026
Updated: 5 Apr 2026

Overview

Speedometer Arduino Nano is an open-source printed circuit board by Brawn1, from the Brawn1/Speedometer repository on GitHub, published under the MIT licence. It is a 2-layer board with 13 parts on 34 nets.

Its parts include 4 resistors, 4 connectors, 1 capacitor and 1 diode. It belongs with the AVR (ATmega, ATtiny) boards of this library.

README

README.md

Hot Wheels Speedometer

Arduino Nano basierter Geschwindigkeitsmesser fuer Hot Wheels Strecken. Zwei IR-Sensoren im Abstand von 10 cm messen die Durchfahrtszeit und ein Servomotor zeigt die Geschwindigkeit auf einer analogen Skala an.

Features

Geschwindigkeitsmessung ueber zwei IR-Sensoren (10 cm Abstand)
Analoge Tacho-Anzeige mit Servomotor
Einstellbarer Servo-Ausschlag ueber 4 DIP-Switches (Multiplikator 1.0x - 5.0x)
Batterieueberwachung mit Rot/Gruen LED (3.7V Li-Ion Akku)
Sensor-Status LEDs (zeigen Sensor 1/2 Ausloesung an)
Startup-Melodie ueber Piezo-Lautsprecher
Serial Monitor Ausgabe fuer Debugging (9600 Baud)

Hardware

Komponenten

Komponente	Anzahl
Arduino Nano	1
IR-Sensor (digital)	2
Servomotor	1
Piezo-Lautsprecher	1
4-fach DIP-Switch	1
LED gruen (Batterie OK)	1
LED rot (Batterie niedrig)	1
LED (Sensor 1 Status)	1
LED (Sensor 2 Status)	1
Widerstand 10k Ohm	2
3.7V Li-Ion Akku	1

Pin-Belegung

Pin	Funktion
D2	IR-Sensor 1 (Start)
D3	IR-Sensor 2 (Ziel)
D4	LED gruen (Batterie OK)
D5	LED rot (Batterie niedrig)
D6	LED Sensor 1
D7	LED Sensor 2
D8	Piezo-Lautsprecher
D9	Servomotor
D10	DIP-Switch 1 (Wert 1)
D11	DIP-Switch 2 (Wert 2)
D12	DIP-Switch 3 (Wert 4)
D13	DIP-Switch 4 (Wert 8)
A0	Batteriespannung (Spannungsteiler)

Spannungsteiler (Batteriemessung)

Die Batteriespannung wird ueber einen Spannungsteiler mit 2x 10k Ohm Widerstaenden gemessen. Der Spannungsteiler halbiert die Batteriespannung, damit sie im ADC-Messbereich des Arduino liegt.

text

Batterie+ ---[R1 10k]---+---[R2 10k]--- GND
                         |
                         A0

DIP-Switch Anschluss

Die DIP-Switches nutzen die internen Pull-Up Widerstaende des Arduino. Jeder Schalter verbindet den Pin mit GND wenn aktiv.

text

Pin D10-D13 ---[DIP-Switch]--- GND

DIP-Switch Multiplikator-Tabelle

Die 4 DIP-Switches steuern den Servo-Ausschlag mit 16 Stufen:

DIP 4-3-2-1	Wert	Multiplikator
0000	0	1.0x
0001	1	1.27x
0010	2	1.53x
0011	3	1.8x
0100	4	2.07x
0101	5	2.33x
0110	6	2.6x
0111	7	2.87x
1000	8	3.13x
1001	9	3.4x
1010	10	3.67x
1011	11	3.93x
1100	12	4.2x
1101	13	4.47x
1110	14	4.73x
1111	15	5.0x

Batterieueberwachung

Spannung	Status	LED
> 3.6V	OK	Gruen
3.4V - 3.6V	Niedrig	Rot
< 3.4V	Schwach	Rot

Die Batterie wird alle 30 Sekunden geprueft. Die Messung erfolgt mit 16-fachem Oversampling fuer stabile Werte und wird nur durchgefuehrt wenn der Servo nicht aktiv ist.

Messablauf

Einschalten: Startup-Melodie, Servo faehrt auf Startposition, Batterie wird geprueft
Auto faehrt durch Sensor 1: LED Sensor 1 leuchtet, Messung startet
Auto faehrt durch Sensor 2: LED Sensor 2 leuchtet, Geschwindigkeit wird berechnet
Servo zeigt Geschwindigkeit an (2 Sekunden)
Servo faehrt zurueck, beide Sensor-LEDs erlischen
Bereit fuer naechste Messung

Bei Timeout (Sensor 2 nicht innerhalb von 4 Sekunden ausgeloest) wird die Messung abgebrochen.

Projektstruktur

text

Speedometer/
├── Code/speedometer/speedometer.ino   # Arduino Sketch
├── Kicad/                             # KiCad Schaltplan
├── Case/                              # Gehaeuse (FreeCAD)
├── LICENSE
└── README.md

Lizenz

Siehe LICENSE.

Parts

Qty	Value	Footprint	References
2	10k	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R3, R4
2	220	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R1, R2
2	Conn_01x02_Socket	Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical	J1, J3
1	2 Color LED Green/Red	LED_THT:LED_D5.0mm-3	D1
1	440µF	Capacitor_THT:CP_Radial_D10.0mm_P5.00mm	C1
1	Arduino_Nano_v3.x	Module:Arduino_Nano	A1
1	Battery_Cell	Battery:BatteryHolder_Keystone_1042_1x18650	BT1
1	Sensor Module 1	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	J2
1	Sensor Module 2	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	J5
1	Tacho	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	M1

Questions

What parts does the Speedometer Arduino Nano use?

13 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Speedometer Arduino Nano KiCad files?

From the Brawn1/Speedometer repository on GitHub, at the commit this page was made from: the board is Kicad/speedometer_Arduino_Nano/speedometer_Arduino_Nano.kicad_pcb and its schematic Kicad/speedometer_Arduino_Nano/speedometer_Arduino_Nano.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Speedometer Arduino Nano design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

AVR (ATmega, ATtiny)

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/brawn1-speedometer" title="Speedometer Arduino Nano in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/brawn1-speedometer.jpg" alt="Speedometer Arduino Nano" width="1200" height="900">

A picture that opens the board, for a README

[![Speedometer Arduino Nano](https://pcbkit.io/embed/boards/brawn1-speedometer.jpg?size=s)](https://pcbkit.io/boards/brawn1-speedometer)

Source

Repository: Brawn1/Speedometer
Board file: Kicad/speedometer_Arduino_Nano/speedometer_Arduino_Nano.kicad_pcb
Commit: 985d2ff
Licence: MIT

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