···

       
22
       
 
       
| SuperMini NRF52840 (Nice!Nano footprint)                | 2                                                                               | `$8.08`  | [AliExpress](https://www.aliexpress.us/item/3256805848952479.html)                                              | Wireless Microcontroller                                                                    | `$4.04` per MCU                                         |

     

       
23
       
 
       
| 301230 3.7V 110mAh LiPo Battery                         | 2                                                                               | `$7.50`  | [AliExpress](https://www.aliexpress.us/item/2255799987926232.html)                                              | the non jst ones are cheaper but the crimper is 60 bucks and there is no way im buying that | `$3.75` per battery                                     |

     

       
24
       
 
       
| Diodes                                                  | 42                                                                              | `$0.99`  | [Aliexpress](https://www.aliexpress.us/item/2255800939822415.html)                                              | 1N4148                                                                                      | `$0.01` per diode                                       |

     

       
25
       
-
       
| Machine Pins                                            | 1                                                                               | `$6.84`  | [AliExpress](https://www.aliexpress.us/item/2251832672116019.html)                                              | 26x2 needed to socket the two MCUs                                                          | comes in a 100 pack of 4 per header                     |

     

       
26
       
-
       
| Machine Sockets 2.54mm                                  | 1                                                                               | `$3.65`  | [AliExpress](https://www.aliexpress.us/item/2251832794091942.html)                                              | 26x2 needed to socket the two MCUs                                                          | comes in a 10 pack of 40x1 rows                         |

     

       
27
       
-
       
| Total cost: `$24.59` + `$13.96` shipping                |                                                                                 |          |                                                                                                                 |                                                                                             |                                                         |

     

       
28
       
 
       
|                                                         |                                                                                 |          |                                                                                                                 |                                                                                             |                                                         |

     

       
29
       
 
       
| Power Switch                                            | 4                                                                               | `$0.39`  | [DigiKey](https://www.digikey.com/en/products/detail/same-sky-formerly-cui-devices/SLW-1277744-3A-N-D/24399208) | added an extra switch for each side as backup                                               | `$0.10` per switch                                      |

     

       
30
       
 
       
| JST PH 2.0mm 2-pin Connector                            | 4                                                                               | `$0.40`  | [DigiKey](https://www.digikey.com/en/products/detail/jst-sales-america-inc/S2B-PH-K-S/926626)                   |                                                                                             | `$0.10` per connector                                   |

     

       
31
       
 
       
| Total cost: `$1.96` + `$8.15` tarrif/sales tax/shipping | i cant find good matches for these on ali and shipping is ridiculous rn as well |          |                                                                                                                 |                                                                                             |                                                         |

     

       
0
       
 
       

     

       
0
       
 
       

     

       
32
       
 
       


     

       
33
       
-
       
Total cost: `$134.10`

     

       
34
       
 
       


     

       
35
       
 
       
### Shipping / Tax / Tariffs / Per store shopping list

     

       
36
       
 
       


     

       
37
       
-
       
| Store      | Shipping                      | Subtotal | Total    | Items                                                                             |

     

       
38
       
-
       
| ---------- | ----------------------------- | -------- | -------- | --------------------------------------------------------------------------------- |

     

       
39
       
-
       
| AliExpress | `$13.96`                      | `$24.59` | `$38.55` | 2x SuperMini NRF52840, Machine Sockets, Machine Pins, 2x LiPo Battery, 42x diodes |

     

       
40
       
-
       
| DigiKey    | `$8.15` (tarrifs and tax too) | `$1.96`  | `$10.11` | 4x Power Switch, 4x JST Connector                                                 |

     

       
41
       
-
       
| Chosfox    | `$8`                          | `$48.70` | `$56.70` | 50x Choc v1 switches, 40x 1u keycaps, 2x 1u homing keycaps, 2x 1.5u keycaps       |

     

       
42
       
-
       
| JLCPCB     | `$13.04`                      | `$15.70` | `$28.74` | 1x PCB                                                                            |

     

       
0
       
 
       

     

       
43
       
 
       


     

       
44
       
 
       
## Schematics

     

       
45
       
 
       


     

···

       
22
       
 
       
| SuperMini NRF52840 (Nice!Nano footprint)                | 2                                                                               | `$8.08`  | [AliExpress](https://www.aliexpress.us/item/3256805848952479.html)                                              | Wireless Microcontroller                                                                    | `$4.04` per MCU                                         |

     

       
23
       
 
       
| 301230 3.7V 110mAh LiPo Battery                         | 2                                                                               | `$7.50`  | [AliExpress](https://www.aliexpress.us/item/2255799987926232.html)                                              | the non jst ones are cheaper but the crimper is 60 bucks and there is no way im buying that | `$3.75` per battery                                     |

     

       
24
       
 
       
| Diodes                                                  | 42                                                                              | `$0.99`  | [Aliexpress](https://www.aliexpress.us/item/2255800939822415.html)                                              | 1N4148                                                                                      | `$0.01` per diode                                       |

     

       
25
       
+
       
| Machine Pins                                            | 1                                                                               | `$0.99`  | [AliExpress](https://www.aliexpress.us/item/3256805556329561.html)                                              | 26x2 needed to socket the two MCUs                                                          | comes in a 100 pack of 4 per header                     |

     

       
26
       
+
       
| Total cost: `$14.10` + `$6.52` shipping                 |                                                                                 |          |                                                                                                                 |                                                                                             |                                                         |

     

       
0
       
 
       

     

       
27
       
 
       
|                                                         |                                                                                 |          |                                                                                                                 |                                                                                             |                                                         |

     

       
28
       
 
       
| Power Switch                                            | 4                                                                               | `$0.39`  | [DigiKey](https://www.digikey.com/en/products/detail/same-sky-formerly-cui-devices/SLW-1277744-3A-N-D/24399208) | added an extra switch for each side as backup                                               | `$0.10` per switch                                      |

     

       
29
       
 
       
| JST PH 2.0mm 2-pin Connector                            | 4                                                                               | `$0.40`  | [DigiKey](https://www.digikey.com/en/products/detail/jst-sales-america-inc/S2B-PH-K-S/926626)                   |                                                                                             | `$0.10` per connector                                   |

     

       
30
       
 
       
| Total cost: `$1.96` + `$8.15` tarrif/sales tax/shipping | i cant find good matches for these on ali and shipping is ridiculous rn as well |          |                                                                                                                 |                                                                                             |                                                         |

     

       
31
       
+
       
|                                                         |                                                                                 |          |                                                                                                                 |

     

       
32
       
+
       
| Machine Sockets 2.54mm                                  | 1                                                                               | `$7.35`  | [Amazon](https://www.amazon.com/dp/B08Y8RB4BH)                                                                  | 26x2 needed to socket the two MCUs                                                          | comes in a 10 pack of 40x1 rows                         |

     

       
33
       
 
       


     

       
34
       
+
       
Total cost: `$123.52`

     

       
35
       
 
       


     

       
36
       
 
       
### Shipping / Tax / Tariffs / Per store shopping list

     

       
37
       
 
       


     

       
38
       
+
       
| Store      | Shipping                      | Subtotal | Total    | Items                                                                       |

     

       
39
       
+
       
| ---------- | ----------------------------- | -------- | -------- | --------------------------------------------------------------------------- |

     

       
40
       
+
       
| AliExpress | `$6.52`                       | `$14.20` | `$20.62` | 2x SuperMini NRF52840, Machine Pins, 2x LiPo Battery, 42x diodes            |

     

       
41
       
+
       
| DigiKey    | `$8.15` (tarrifs and tax too) | `$1.96`  | `$10.11` | 4x Power Switch, 4x JST Connector                                           |

     

       
42
       
+
       
| Chosfox    | `$8`                          | `$48.70` | `$56.70` | 50x Choc v1 switches, 40x 1u keycaps, 2x 1u homing keycaps, 2x 1.5u keycaps |

     

       
43
       
+
       
| JLCPCB     | `$13.04`                      | `$15.70` | `$28.74` | 1x PCB                                                                      |

     

       
44
       
+
       
| Amazon     | `$0`                          | `7.35`   | `$7.35`  | machine sockets                                                             |

     

       
45
       
 
       


     

       
46
       
 
       
## Schematics

     

       
47