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This page contains items available for purchase to aid in construction of the Pinewood Derby Timer (PDT).

Custom Products

In addition to the standard components needed for constructing the PDT the following custom printed circuit boards (PCBs) are available for purchase. The PCBs are not required but they simplify the construction of the PDT by providing mounting and wiring points for the various components.

PDT shield PCB

The main PDT PCB has the standard Arduino shield format that allows it to be stacked directly on top of the Arduino Uno microcontroller. A bare PCB and one populated with components are shown below.

Bare PDT shield PCB Populated PDT shield PCB

I2C Splitter Board

The I2C splitter board aids in wiring the optional place/time displays in parallel. It can be utilized with the optional pre-made jumper wires or by soldering wires directly to the board. A splitter board utilizing jumper wires is shown below:

I2C splitter board


The items below are available for purchase. Please note the following:

Please email the contact address above if you have any questions or need alternate shipping options.


   All items are in stock except any noted below:

   > 20cm jumpers - out of stock, looking for new source

   Last updated: 3 September 2017

Bare PDT shield PCB

PDT shield PCB (bare)

This is for the bare PDT shield PCB only - no components or headers are included.

Price: $12.50 ( > 10 available)    

Base components

PDT shield PCB with base components

The same bare PDT shield as above plus base components which include: RGB status LED & CLR, red 3mm power LED & CLR, two button switches, potentiometer and the headers for mounting the shield to an Arduino. Note that items are loose - not soldered to the board.

Price: $17.50 (6 available)    

PDT lane component set

Lane component (light source, detector and CLR) set

One lane component set consisting of a light source (visible light LED) with a corresponding current limiting resistor (CLR) and a detector (phototransistor). You will need one (1) set for each lane. (Delivery note: phototransistor is marked with blue mark on side.)

Price: $1.65 ( > 10 available)    

Start gate switch

Start gate switch

A snap switch for the track's starting gate. Only one (1) is needed for the timer.

Price: $2.75 ( > 10 available)    

Place/time display

Place / time display (RED)

An Adafruit 0.56" 7-segment display (RED) with backpack for displaying each lane's place and time result. You will need one (1) for each lane. Note that soldering is required to attach the display to the backpack.

Price: $9.50 ( > 10 available)    

Jumper wire

Place / time display (RED) with 20cm jumper wire

The same display as above with a 20cm jumper wire.

Price: $10.00 (OUT OF STOCK)    

Jumper wire

Place / time display (RED) with 30cm jumper wire

The same display as above with a 30cm jumper wire.

Price: $10.50 ( > 10 available)    

I2C splitter

I2C Splitter

An I2C splitter board to aid in connecting the place/time displays to the PDT. You only need one (1) for the timer.

Price: $7.50 (3 available)    

Jumper wire

I2C Splitter with 20cm jumper wire

The same splitter as above with a 20cm jumper wire.

Price: $8.00 (OUT OF STOCK)    

Jumper wire

I2C Splitter with 30cm jumper wire

The same splitter as above with a 30cm jumper wire.

Price: $8.50 (3 available)    

Items have been sold to 45 states and internationally to 5 countries on 4 different continents.

Last updated: 29 May 2017