Control board
About the Control board
Control board is an open source AVR/Arduino PCB design by edatki, published on GitHub. It is a 2-layer board measuring 124 × 113 mm, with 95 components from 16 distinct parts.
Its main chip is the ATtiny85-20P, from the AVR/Arduino family. Other key parts include the 74LS74, 74LS273, 74LS373, 74LS192 and 27C512. By type, the board carries 52 diodes, 23 resistors, 12 ICs, 4 switches and 3 connectors.
From the project
A custom CPU implemented in 74-series logic
Main components on the Control board
Control board bill of materials (BOM)
95 components, 16 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | 74LS74 | DIP-14_W7.62mm_Socket | U1, U2, U12 |
| 1 | 74LS273 | DIP-20_W7.62mm_Socket | U3 |
| 2 | 74LS373 | DIP-20_W7.62mm_Socket | U4, U6 |
| 1 | 74LS192 | DIP-16_W7.62mm_Socket | U5 |
| 4 | 27C512 | DIP-28_W15.24mm_Socket | U7, U8, U9, U10 |
| 1 | ATtiny85-20P | DIP-8_W7.62mm_Socket | U11 |
| 1 | ICSP | PinHeader_2x03_P2.54mm_Vertical | J1 |
| 1 | Conn_02x32_Odd_Even | IDC-Header_2x32_P2.54mm_Vertical | J2 |
| 1 | Conn_01x02 | PinHeader_1x02_P2.54mm_Vertical | J3 |
| 1 | R_Potentiometer | Potentiometer_Bourns_3386F_Vertical | RV1 |
| 4 | SW_Push | SW_PUSH_6mm | SW1, SW2, SW3, SW4 |
| 52 | LED | LED_D2.0mm_W4.8mm_H2.5mm_FlatTop | D1, D2, D3, D4, D5, D6, D7, D8 +44 |
| 6 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R5, R6, R10, R11, R13 |
| 7 | 330R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3, R4, R7, R8, R9, R12 |
| 4 | 1K | R_Array_SIP9 | RN1, RN2, RN3, RN4 |
| 6 | 330R | R_Array_SIP9 | RN5, RN6, RN7, RN8, RN9, RN10 |
Control board design files
The KiCad project lives in the edatki/e74-cpu repository on GitHub; these links point at the commit this page was built from.
Control board: common questions
What microcontroller does the Control board use?
The Control board is built around the ATtiny85-20P, from the AVR/Arduino family.
How big is the Control board?
The Control board measures 124 × 113 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Control board?
95 components, from 16 distinct parts. The full bill of materials is listed on this page.
Where can I download the Control board design files?
From the edatki/e74-cpu repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Control board design in my own project?
The repository has no license, so all rights stay with edatki. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Control board without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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