Component
Example
Est. price
ESP32-C3 dev board
Seeed Studio XIAO ESP32-C3 / ESP32-C3 Super Mini
€2-5
GPS module
ATGM336H (with ceramic antenna)
€3-9
Accelerometer
ADXL345 3-axis module
€2-4
Power
3x AA battery holder with wires
€0.50-1
Component
Description
Est. price
TP4056 USB-C charger
Li-Po charging with protection circuit
€1-2
Li-Po battery
3.7V 1000-2500mAh, JST-PH
€5-8
Breadboard
400 points, for prototyping
€1-2
Tool
Notes
Soldering iron
Temperature-controlled, ~60-65W
Solder
Leaded (Sn63/Pb37), 0.5mm
Multimeter
For voltage measurements
Flush cutters
For trimming wires
USB-C cable
For programming the ESP32
Small Batch — 100 units (~€7-8 each) Source from AliExpress for lower prices:
Component
Unit price
ESP32-C3 bare module
~€1.50
AT6558 GPS module + antenna
~€2.00
SW-18010P vibration switch (replaces ADXL345)
~€0.05
Custom PCB + passives
~€1.50
3x AA battery holder
~€0.30
3D printed enclosure
~€1-2
Total ~€7-8
Volume — 1000+ units (~€4-5 each)
Component
Unit price
ESP32-C3 chip (bare)
~€0.60
AT6558 GPS chip
~€0.80
SW-18010P vibration switch
~€0.05
Custom PCB + SMD assembly (JLCPCB)
~€1.50
Injection molded enclosure
~€1-2
Total ~€4-5
All components run at 3.3V logic — no level shifters needed
ATGM336H is NOT 5V tolerant — always connect to 3V3
GPS ceramic antenna is usually included with the ATGM336H module
No SIM card, cellular modem, or cellular antenna needed
For production, the ADXL345 can be replaced by a bare SW-18010P vibration switch (cheaper, zero power drain, simpler wiring)