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Mustango Keyboard Encoder v1.1

1 year ago 467
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2019-01-18 --> Revised BOM OK. Enter on the schematic page, select BOM button on the top menu bar and Order LCSC components from that window.

Change Notes for revision v1.1:

  • Resolved GND unconnected tracks/planes.
  • Improved GND Layout and placed GND plane only on the bottom layer. Removed coper fingers with polygon cutouts.
  • Rerouted some tracks.
  • Moved down USB connector and varistors. Upper varistor was to close to C7 and was difficult to solder.
  • Included a Pull-Up missing on RE3.
  • Removed unnecessary Pull-Up resistor on RB7 (P2_LEFT) - Uses internal Pull-Up from PORTB.

Make an arcade machine keyboard encoder using a PIC microcontroller.

This project arose from the idea of having a cheaper solution for encoding switches and buttons than existing commercial ones since I was trying to make an arcade cabinet as cheap as possible. So, I wanted to do a quick personal project to practice PCB design and microcontroller programming.

Keyboard encoders are used to transform pushbutton/switch clicks/actions into keyboard presses. That is, whenever a button is pressed a key (ASCII code) will be sent to the PC via USB interface, if USB is used for communication with PC.

The microcontroller will be emulating a HID USB Keyboard, so no special driver is needed on the PC side, because HID Keyboard driver is already present on every Operating System.

When the USB cable coming from the uC is connected to the PC, OS will detect it as a keyboard and you could check this by opening Device manager in your OS.


Mustango Keyboard Encoder

Mustango Keyboard Encoder


ID Name Designator Footprint Quantity Manufacturer Part Supplier Supplier Part Mounted
1 WJ300V-5.00-2P P5,P6,P8,P9,P12,P13,P15,P2,P3,P11,P14,P4,P7,P10 WJ300V-5.00-2P 14 WJ300V-5.00-2P LCSC C8385 Yes
2 100nF C2,C4,C1,C9 1206 4 GRM319R71H104KA01D LCSC C86047 Yes
3 10uF C3,C5 1206 2 CL31B106KAHNNNE LCSC C14860 Yes
4 Header-Male-2.54_2x3 P1 HDR-3X2/2.54 1 2.54mm2*3P LCSC C65114 Yes
5 PIC18F4550- I/PT U2 TQFP-44_10X10X08P 1 PIC18F4550- I/PT LCSC C21667 Yes
6 RL0603E005M300K E1,E2 0603 2 RL0603E005M300K LCSC C20959 Yes
7 22Ω R17,R18 0805 2 0805W8F220JT5E LCSC C17561 Yes
8 100uF C8,C7 CAP-D8.0XH6.5 2 HV101M025F065R LCSC C59945 Yes
9 2.2uH L1 1008 1 LQM2HPN2R2MG0L LCSC C86092 Yes
10 MICRO USB 5S B USB1 MICRO-USB-1 1 micro USBFemale LCSC C10418 Yes
11 470nF C6 0805 1 0805F474M500NT LCSC C1778 Yes
12 10KΩ(103) R5,R8,R1,R2,R3,R4,R6,R7,R9,R10,R12,R14,R16,R11,R13,R21 0805 16 RTT05103JTP LCSC C103914 Yes
13 WJ300V-5.00-3P P17,P16 WJ300V-5.00-3P 2 WJ300V-5.00-3P LCSC C8467 Yes
14 8MHz X1 OSC-YSO-7050_4P 1 O70508MHEA4SI LCSC C41296 Yes
15 0Ω(0R0) R19 0805 1 CR0805J80000G LCSC C101922 Yes
16 3-1437565-0 KEY1 KEY-6.0*6.0 1 3-1437565-0 LCSC C86463 Yes
17 17-21/GHC-YR1S2/3T POWER LED-0805 1 17-21/GHC-YR1S2/3T LCSC C73546 Yes
18 220Ω R20 0805 1 0805W8F2200T5E LCSC C17557 Yes


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