My inspiration for this PCB came from following Ian Ward's project on his web site:
This PCB implements the LCD Character Display: Milestone 1 Complete! stage of this series of videos.
But there is more to come in the future, so checkout Ian's videos on his future plans:
Discrete Logic Rhythm Game Prototype (no CPU)
Designing a Rhythm Game: Homebrew CPU Plan Step 2
I will try to keep up with him.
PCB Front Image
PCB Back Image
| Ref | Qty | Value | Vendor\Part # | Description |
|---|---|---|---|---|
| C1, C3, C5 | 3 | 10uF | Generic | Electrolytic capacitor |
| C2, C4, C6 | 2 | .01uF | Digikey\FG28C0G1H103JNT06 | Unpolarized capacitor |
| D1 | 1 | YELLOW\Reset | Generic | LED\3mm\Yellow |
| D2 | 1 | RED\HALT | Generic | LED\3mm\Red |
| D3 | 1 | BLUE\CLOCK | Generic | LED\3mm\Blue |
| D4, D5 | 2 | 10_SEG_LED BAR_GRAPH (Blue) | Digikey\1497-1079-5-ND | LED Bar Graph\Blue\1x10 |
| D6 | 1 | 10_SEG_LED BAR_GRAPH (Yellow) | Digikey\754-1179-5-ND | LED Bar Graph\Yellow\1x10 |
| D7 | 1 | GREEN | Generic | LED\3mm\Green |
| J1 | 1 | PinSocket_1x16_P2.54mm_Vertical | Generic | Female Pin Header\1x16\2.54mm pitch |
| J2 | 1 | UJC-HP-M-G-5-MSMT-TR | Digikey\2223-UJC-HP-M-G-5-MSMT-TRDKR-ND | Type C/20 VDC/3A/Horizontal/6 Pin/Power Only |
| R1, R3, R8 | 3 | 1Kohm | Digikey\13-MFR-25FTE52-1KCT-ND | Resistor\1Kohm\1%\1/4W\Axial |
| R2, R6, R7, R9 | 4 | 330ohm | Digikey\13-MFR-25FRF52-330RCT-ND | Resistor\330ohm\1%\1/4W\Axial |
| R4 | 1 | 220ohm | Generic | Resistor\220ohm\1%\1/4W\Axial |
| R5 | 1 | 3ohm | Generic | Resistor\3ohm\1%\1/4W\Axial |
| R10, R11 | 2 | 5.1Kohm | Digikey\13-MFR-25FTE52-5K1CT-ND | Resistor\5K1ohm\1%\1/4W\Axial |
| RN1, RN2, RN3 | 3 | 470ohm | Digikey\4609X-101-471LF-ND | Resistor Array\8 Resistors\470ohm\9SIP |
| RV1 | 1 | 10Kohm | Jameco\2276439 | Panasonic EWAQ30C15A14 Audio Slide Pot |
| RV2, RV3 | 2 | 5Kohm | Digikey\3386P-1-502LF | Trimmer Pot\5Kohms\0.5W\1/2W\Through Hole |
| SW1 | 1 | TL2230 | Digikey\EG6031-ND | Switch\Pushbutton\DPDT\Through Hole |
| S1 | 1 | REG SELECT | Digikey\450-1654-ND | Switch\Tactile\SPST-NO\0.05A\24V\Through Hole |
| S2 | 1 | ENABLE | Digikey\450-1654-ND | Switch\Tactile\SPST-NO\0.05A\24V\Through Hole |
| U1, U3 | 2 | LM555 | Digikey\LM555CNNS/NOPB-ND | 555 Timer/Oscillator\100kHz\8-PDIP |
| U2 | 1 | 74LS00 | Digikey\296-1626-ND | NAND Gate IC 4 Channel 14-PDIP |
| U4, U5, U6, U7, U8 | 5 | 74LS163 | Digikey\296-3661-5-ND | Binary Counter\4 Bit\Positive Edge\16-PDIP |
| U9, U10 | 2 | SST39SF040-70-4C-PHE | Digikey\SST39SF040-70-4C-PHE-ND | FLASH Memory\4Mbit\70ns\32-PDIP |
The LCD and its 16-pin male header are represented only with 3D models, but you need a 2004 LCD with a soldered 16-pin male header with a pitch of 2.54mm to plug into the 16 pin female header to complete this PCB. I have found the best place to get these is on eBay.
Do NOT try to use a 2004 LCD with an I2C adapter on it.
Most symbols/footprints/models are contained under the 'libraries' directory. Capacitors, resistors and LEDs use KiCad symbols/footprints/models.
KiCad 7.0.10 was used to create this PCB. KiCad 8.0.1 is out now and this project opens in that version. The newer KiCad will warn that this project was created in previous version and will be saved in a the newer format. When closing the schematic or a PCB just discard any changes. If you do not you will not be able to use KiCad 7 any more without difficulties.
Models in KiCad's 3D view will display an appropriate socket under the ICs but these can be omitted on the PCB - they are used to make it easier to replace any components should they need it in the future. The only exceptions are the sockets for the SST39SF040 FLASH chips. These chips can be changed out for different program\lookup combinations, so you do not want to solder them to the PCB. I would recommend using 32-pin sockets from Aries Electronics or something equivalent, for example, Digikey\A410AE-ND.