Applications and Implications

What will it do?

The idea is when I commute by bike in the countryside, sometimes I'm feeling in danger. Especially near my house, where there is a stone quarry with trucks that use the same small road I need to take to go to work.

So the Idea is to create a special traffic sign that I'll ask to put at the stone quarry. The sign can be activated with LoRa with a small module put on the bike called Wally (from Where is Wally?).

The sign will show the distance of the bike and the first name of the driver.

Who's done what beforehand?

• LED panel
• Helmet-Mounted LED
• LED Panel
• GPS Handle bar
• LED Display
• GPS Bike
• Traffic light
• LoRa Bike tracker
• Bike tracker

What will you design?

CAD

Here is a first look at the CAD file for the TrafficSign

Here is a first idea about the case and all the components it needs to contain.

Electronics

Traffic Sign board
A simple board that is able to received LoRa Signals, and show some information on a matrix LED.

Wally board
A board with an OLED screen and 2 buttons that can send LorA Signals.

What materials and components will be used? Where will come from? How much will they cost?

Traffic Sign

Section	Component	Characteristics	Qty	Unit	Cost Unit	Vendor/Brand	Total Cost
Frame	P. P.	Thickness 1mm	0,8	m²	16,25 €	Sotradis	13,00 €
	Plywood	Thickness 5mm	2	m²	20,00 €	Sotradis	40,00 €
	Acrylic glass	Thickness 2mm-A3 size	1	piece	8,00 €	Juliyeh	8,00 €
	Reflective vinyl	30x100cm	1	piece	2,09 €	Old Local Store	2,09 €
Bike LEDs	Red LED	SMD 1206	20	piece	0,18 €	AEDIKO	3,60 €
	Resistors	200 Ohm SMD 1206	20	piece	0,03 €	Go Tronic	0,60 €
	Copper Foile Tape	20cm x 30cm	1	piece	2,00 €	QWORK	2,00 €
Board	Copper PCB	FR1 – 7x10cm	1	piece	0,60 €		0,60 €
	XIAO SMAD21		1	piece	6,40 €	Go Tronic	6,40 €
	LEX Matrix screen	8x32 WS2812B LED	1	piece	11,44 €		11,44 €
						Total	87,73 €

Wally

Section	Component	Characteristics	Qty	Unit	Cost Unit	Vendor/Brand	Total Cost
Board	Copper PCB	FR1 – 7x10cm	1	piece	0,60 €	sourcing map	0,60 €
	XIAO ESP32C3		1	piece	6,40 €	Go Tronic	6,40 €
	Resistors	180 Ohm SMD 1206	1	piece	0,03 €	Go Tronic	0,03 €
	Resistors	10k Ohm SMD 1206	2	piece	0,03 €	Go Tronic	0,06 €
	PushButton	12mm square	2	piece	0,55 €	Sparkfun	1,10 €
	FM transmitter		1	piece	4,39 €	Go Go Store	4,39 €
	LoRa transmitter	RF SX1276 - 868Mhz	1	piece	5,74 €	Wireless Life Store	5,74 €
	Battery	Lipo3,7V – 500mAh	1	piece	3,00 €	LW Battery Store	3,00 €
	OLED Display	0,96 inch I2C module	1	piece	2,69 €	Fnd Chips Store	2,69 €
Case	PLA filament	2,85 mm	3,00 €	m	0,15 €		0,45 €
	Acrylic Glass	11x25mm	1,00 €	piece	0,00 €		0,00 €
						Total	24,46 €

What parts and systems will be made?

1. Traffic Sign frame (made from aluminum and plywood)
2. 2 PCB for the Sign and the Wally board
3. A 3D Case

What processes will be used?

CNC milling machine

1. 2 aluminum layers of the Traffic Sign
2. PCB for the Wally Board

3D print

1. Wally case

Vinyl Cut

1. PCB for the LEDs Bike of the Traffic Sign
2. Reflective Vinyl for the Traffic Sign

Laser Cut

1. Plywood cut for the Traffic Sign

What questions need to be answered?

1. What's the maximal range of the LoRa Signal?
2. What will be the battery life for the Wally?
3. How much current does need the matrix LED?

How will you organize yourself?

How will it be evaluated?

• Is all the layers of the Traffic sign fit together (kerf, bolts, etc.)?
• Is the Matrix LEDs is able to show some text?
• Is the Bike LEDs can light on?
• Is the Wally board fit into its case?
• Is the Wally board can send information through LoRa to the Traffic Sign?
• Is the Traffic Sign can receive LoRA data and show it on the matrix LEDs?
• Is the OLED screen of the Wally Board can show some information?
• Are the buttons of the Wally board can be pushed to send a LoRa Signal?
• Is the Wally board can be powered by its battery?