
KEY2USB
acwright/KEY2USB
Commodore 64 / C128 expansion port cartridge to USB HID keyboard

Ac onoff controller is an open-source printed circuit board by RollMan, from the RollMan/ac_onoff_controller repository on GitHub. It is a 2-layer board of 100 × 52.5 mm with 41 parts on 42 nets, routed with 240 tracks and 122 vias.
It is built around the ATMEGA88P-20PU, DHT20 and 2SK4017(Q), with the 1N5227B, 2SC1815 and SS22F25G4.5 among its other parts. Its parts include 7 capacitors, 7 diodes, 6 resistors, 5 switches and 4 transistors. It belongs with the AVR (ATmega, ATtiny) boards of this library.

The 2nd servo motor (M2) must be connected to PB2 which is assigned as compare output mode.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 0.1u | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C2, C4, C5, C6 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 4 | SW_Push | Button_Switch_THT:SW_PUSH_6mm_H7.3mm | SW2, SW3, SW4, SW5 |
| 3 | 22k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P2.54mm_Vertical | R6, R7, R8 |
| 3 | 2SK4017 | Package_TO_SOT_THT:TO-251-3_Vertical | Q1, Q2, Q6 |
| 3 | LED | LED_THT:LED_D3.0mm | D4, D5, D6 |
| 2 | 1N4148 | Diode_THT:D_A-405_P10.16mm_Horizontal | D2, D3 |
| 2 | 500 | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P15.24mm_Horizontal | R4, R5 |
| 2 | Motor_Servo | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | M1, M2 |
| 1 | 1000u | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C3 |
| 1 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C7 |
| 1 | 1N5227B | Diode_THT:D_A-405_P10.16mm_Horizontal | D1 |
| 1 | 20k | ac_onoff_controller:GF063P | RV1 |
| 1 | 2SC1815 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q3 |
| 1 | 47k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P15.24mm_Horizontal | R1 |
| 1 | ATmega88P-20P | Package_DIP:DIP-28_W7.62mm | U1 |
| 1 | Battery | Connector_JST:JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | BT1 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | Conn_02x04_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J1 |
| 1 | D | Diode_THT:D_DO-15_P12.70mm_Horizontal | D7 |
| 1 | DHT20 | ac_onoff_controller:Aosong_DHT20 | U2 |
| 1 | SW_SPST | ac_onoff_controller:SS-22F25-G4 | SW1 |
It measures 100 × 52.5 mm and has 2 copper layers, 1.6 mm thick.
41 parts, built around the ATMEGA88P-20PU, DHT20, 2SK4017(Q) and 1N5227B. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the RollMan/ac_onoff_controller repository on GitHub, at the commit this page was made from: the board is hardware/ac_onoff_controller/ac_onoff_controller.kicad_pcb and its schematic hardware/ac_onoff_controller/ac_onoff_controller.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask RollMan before reusing the design.

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Commodore 64 / C128 expansion port cartridge to USB HID keyboard

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