# Prototype

This is the hardware design for the initial prototype gifted as a birthday present.
It's a single sided PCB layout suitable for hand etching at home.

[![hand etching prototype pcb](https://www.xythobuz.de/img/lars_13_small.jpg)](https://www.xythobuz.de/img/lars_13.jpg)
[![assembled prototype](https://www.xythobuz.de/img/lars_10_small.jpg)](https://www.xythobuz.de/img/lars_10.jpg)

You can also [download the Gerber files to order PCBs online](./plot/fab_pcb.zip).

## Bill of Materials

These are all the parts required to assemble the prototype.

| ID | Type | Link |
| -- | ---- | ---- |
| U9 | Raspberry Pi Pico | [Reichelt.de](https://www.reichelt.de/raspberry-pi-pico-rp2040-cortex-m0-microusb-rasp-pi-pico-p295706.html?&nbc=1), [Amazon.de](https://www.amazon.de/Raspberry-Pi-Pico/dp/B09KVB8LVR) |
| U2 | TP4056 Charger Module | [Amazon.de](https://www.amazon.de/AZDelivery-%E2%AD%90%E2%AD%90%E2%AD%90%E2%AD%90%E2%AD%90-TP4056-Laderegler-Lithium/dp/B07D2G345P) |
| U4, U6, U8 | MOSFET Module N-Channel | [Amazon.de](https://www.amazon.de/Schaltersteuerplatine-Motorsteuerplatine-MOSFET-Triggerschalter-Reglersteuerplatine-Dual-Hochleistungs/dp/B0CBK7D1GD) |
| U3, U5, U7 | Step-Up Converter Module | [Amazon.de](https://www.amazon.de/Converter-Spannungswandler-LAOMAO-Netzteil-Kompatibel/dp/B0B932BR7V) |
| J2 | SSD1306 128x64 0.96" Display | [Amazon.de](https://www.amazon.de/AZDelivery-Display-Arduino-Raspberry-gratis/dp/B01L9GC470) |
| S1 | ALPS EC12E24244 | [Reichelt.de](https://www.reichelt.de/drehimpulsegeber-24-impulse-24-rastungen-vertikal-stec12e08-p73923.html?&nbc=1) |
| - | Cap for encoder knob | [Reichelt.de](https://www.reichelt.de/potentiometerknopf-fuer-achse-6-4-5-mm-schwarz-knopf-10-150e-p73960.html) |
| D1 - D4 | LED 5mm | [Reichelt.de](https://www.reichelt.de/led-5mm-bedrahtet-rot-450-mcd-90--5603r1c-khb-a-p361958.html?&nbc=1) |
| D5 - D8 | 1N5819 Schottky Diode | [Reichelt.de](https://www.reichelt.de/schottkydiode-40-v-1-a-do-41-1n-5819-p41850.html?&nbc=1) |
| R1 - R4 | Resistor 1k Ohm | [Reichelt.de](https://www.reichelt.de/widerstand-metallschicht-1-00-kohm-0207-0-6-w-1--metall-1-00k-p11403.html?&nbc=1) |
| R5 | Resistor 10k Ohm 0.1% Axial | [Reichelt.de](https://www.reichelt.de/widerstand-metallschicht-10-kohm-0207-0-6-w-0-1--mpr-10-0k-p12770.html?&nbc=1) |
| R6 | Resistor 18k Ohm 0.1% Axial | [Reichelt.de](https://www.reichelt.de/widerstand-metallfilm-18-kohm-0-1-0-6-w-tk25-0207-mpr-18-0k-p12837.html?&nbc=1) |
| SW1 - SW4 | 12mm waterproof stainless steel push button | N/A |
| SW5A | Unknown Power Switch | N/A |