Robot Bill of Materials
This page lists the parts to buy to build a Chromapi yourself. For the components mounted on the motherboard, see the PCB Bill of Materials.
Notes
- Prices are based on purchases in France; pricing info for other countries will be added over time.
- Some parts can only be bought in bulk packs, which explains some of the total prices.
| Component | Qty | Unit price | Total price | Reference | Manufacturer | Supplier |
|---|---|---|---|---|---|---|
| 18650 batteries | 2 | €3.99 | €7.98 | INR18650-P28A | Molicel | Nkon |
| 18650 battery holder | 1 | €2.14 | €2.14 | HP157-BATTERY-TRAY | Radiomaster | Radiomaster |
| Power switch | 1 | €0.63 | €6.30 | B0CH3JCQM5 | Rebower | Amazon |
| Microswitch | 4 | €0.26 | €5.19 | WK1-04A-13.5P | JZK | Amazon |
| Raspberry Pi1 | 1 | €66.30 | €66.30 | Raspberry Pi 4 Model B | Raspberry Pi | Kubii |
| SD card | 1 | €16.20 | €16.20 | Ultra microSDHC 32 GB | SanDisk | Kubii |
| Camera2 | 1 | €19.49 | €19.49 | IMX219-D160 | Waveshare | Amazon |
| Servomotor3 | 12 | €14.00 | €168.00 | STS3215-C001 | Feetech | — |
| Speaker | 1 | €4.10 | €8.19 | 4R3W | Xevtrak | Amazon |
| Fan | 1 | €15.90 | €15.90 | Noctua NF-A4x10 PWM | Noctua | Amazon |
The software architecture is designed to run on the Raspberry Pi 4, 5, and 2W. Note that all testing so far has been done on a Raspberry Pi 4 Model B with 8GB of RAM, so some adjustments may be needed for the other models. ↩︎
This camera is sold without a mount (it’s a Raspberry Pi Camera Module v2 sensor): you can either buy a camera with an equivalent module and swap in the IMX219-D160, or skip the IMX219-D160 and directly use the camera of your choice with its own mount. ↩︎
Make sure to pick the 7.4V version. If you want more powerful servomotors, Chromapi’s architecture is permissive enough to use the 12V version, provided the power supply is adapted accordingly. ↩︎