ATtiny85 Charlieplex LED Grid
ATtiny85 Charlieplex LED Grid is an open source AVR/Arduino PCB design by rjwalters: a 2-layer, 50 × 55 mm board with 19 components (8 distinct parts). It is built around the ATTINY85-20PU.
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A working 3 × 3 red LED sequencer built around a real ATtiny85-20PU. Four GPIO pins drive nine LEDs through four 330 Ω resistors. The 50 × 55 mm, two-layer board includes regulated 3.3–5 V power input, supply decoupling, reset pullup, and a standard six-pin AVR ISP header.
See HARDWARE.md for the complete pinout, verified component identities, power instructions and firmware programming. U1, J1 and J2 are hand-soldered after the sixteen SMT components are assembled. The supplied firmware advances through D1–D9; physical hardware testing has not yet been performed.
Built around
Parts list
19 components, 8 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATTINY85-20PU ATtiny85-20PU | DIP-8_W7.62mm | U1 |
| 1 | C7501260 POWER | PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | C65114 AVR-ISP | PinHeader_2x03_P2.54mm_Vertical | J2 |
| 9 | LED | LED_0805_2012Metric | D1, D2, D3, D4, D5, D6, D7, D8 +1 |
| 1 | 100NF 100nF | C_0805_2012Metric | C1 |
| 1 | 4.7UF 4.7uF | C_0805_2012Metric | C2 |
| 4 | 330R | R_0805_2012Metric | R1, R2, R3, R4 |
| 1 | 10K 10k | R_0805_2012Metric | R5 |
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