BOM Builder
Adjust quantities, compare prices across stores, and fit the build to your budget. Plan the payments, follow the recommended purchase order, and know where instalments are available before you check out. All figures update live.
The essential minimum is $25.80. Below that, no optional part can be dropped to fit.
Over budget by $0.00. Drop the optional extras below to stay inside it.
Street prices are typical, not quotes. Open the Compare links next to each part to find the current best offer across stores and price comparators.
Payment plan
Pay the full total now, or split it across several payments. The amounts below update with your quantities and choices above.
Plans are examples of the options that can appear at a store's checkout. Availability depends on the store, the order value and your account, and some financing plans charge interest. Confirm the exact terms before you pay.
What to buy first
Follow the phases for the shortest wait and a smoother first build. Each list updates live with the quantities and choices above.
Phase 1: core electronics Modules with the longest shipping times, usually 7-20+ days from Asia. Order these first: every later step depends on them. $0.00
- ESP32-WROOM-32 x1 $8.50
- E22-400M30S x1 $5.20
- SSD1309 OLED 2.42" x1 $3.80
- NEO-6M GPS x1 $2.90
- SMA Connector + Antenna x1 $1.20
- Tactile Switches x4 $0.60
- TP4056 Charger x1 $0.80
- Passive Buzzer optional x1 $0.40
Phase 2: bench and power Parts you can buy locally or receive quickly. Order them as phase 1 ships, so you can bench-test the day the boards arrive. $0.00
- 18650 Battery x1 $2.50
- Resistors & Capacitors x1 $0.30
Phase 3: enclosure and finishing Print or order the case last, after a successful bench test, so it matches the final wiring layout. $0.00
- 3D-Printed Enclosure optional x1 $2.00
Which stores offer instalments?
- Amazon.it
- Monthly instalments on eligible orders through Cofidis financing (from 3 up to 24 payments). Interest-free promotions appear regularly; you choose the rate plan at checkout.
- PayPal merchants
- PayPal Paga in 3 Rate is interest-free with no fees, offered only where the seller enables it at checkout.
- Scalapay and Klarna stores
- Pay in 3, Pay in 4 or longer monthly plans at partner merchants, interest-free when each payment arrives on time.
- eBay.it and AliExpress
- Single payment at checkout with card or PayPal. These platforms do not offer instalment plans themselves.
- Google Shopping and Trovaprezzi
- Price comparators. You always pay on the merchant's own site, where instalment options vary.
- Local store or 3D print
- Cash, card or bank transfer, usually as one payment.