Iolite
About the Iolite PCB
Iolite is an open source AVR/Arduino PCB design by jtsiomb, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 149 × 100 mm, with 47 components from 24 distinct parts.
Its main chip is the ATMEGA168-P, from the AVR/Arduino family. Other key parts include the 74LS138, DS1302, 74HC05 and MAX232. By type, the board carries 16 resistors, 12 capacitors, 8 connectors, 5 ICs, 2 crystals and 2 jumpers.
From the project
Homebrew Motorola 68010 computer
Homebrew 68k computer project 1 ===============================
About ----- The purpose of this project is to design a minimal but useful homebrew computer, based on the Motorola 68010 16/32-bit processor.
The current hardware design is broken into a main processor board, and an I/O and expansion board with an AVR microcontroller playing the role of UART, timer, and RTC all in one.
Main components on the Iolite
Iolite bill of materials (BOM)
47 components, 24 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATMEGA168-P | DIP-28_W7.62mm | IC1 |
| 1 | 74LS138 | DIP-16_W7.62mm | U1 |
| 1 | DS1302 | DIP-8_W7.62mm | U2 |
| 1 | 74HC05 | DIP-14_W7.62mm | U5 |
| 1 | MAX232 | DIP-16_W7.62mm | U6 |
| 1 | 14.7456M | crystal_smd_7.6x4.1 | Y1 |
| 1 | 32.768K | Crystal_Watch | Y2 |
| 1 | DB9 | DB9MC | J2 |
| 1 | CONN_CTL_DATA | Pin_Header_Straight_2x18 | P1 |
| 1 | CONN_ADDR | Pin_Header_Straight_2x13 | P2 |
| 1 | SLOT_PWR | Pin_Header_Angled_1x03 | P3 |
| 1 | SLOT1 | edgecon_2x17 | P4 |
| 1 | SLOT2 | edgecon_2x17 | P5 |
| 1 | CONN_01X02 | Pin_Header_Straight_1x02 | P6 |
| 1 | SLOT_EX_ADDR | edgecon_2x17 | P7 |
| 1 | 3v | CR2032_CoinCell | BT1 |
| 1 | AVR_ISP | Pin_Header_Straight_2x03 | ISP1 |
| 1 | INT_S1 | Pin_Header_Straight_2x01 | JP1 |
| 1 | INT_S2 | Pin_Header_Straight_2x01 | JP2 |
| 2 | 22pF | C_0805 | C1, C5 |
Show 4 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 5 | 0.1uF | C_Rect_L7_W2.5_P5 | C2, C3, C4, C6, C7 |
| 5 | 1uF | c_elec_4x5.7 | C8, C9, C10, C11, C12 |
| 8 | 4.7k | R_0805 | R1, R4, R5, R6, R7, R8, R9, R10 |
| 8 | 120R | R_0805 | R2, R3, R11, R12, R13, R14, R15, R16 |
Iolite design files
The KiCad project lives in the jtsiomb/m68kcomputer repository on GitHub; these links point at the commit this page was built from.
- Layouthw/iolite.kicad_pcb
Iolite: common questions
What microcontroller does the Iolite use?
The Iolite is built around the ATMEGA168-P, from the AVR/Arduino family.
How big is the Iolite PCB?
The Iolite measures 149 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Iolite?
47 components, from 24 distinct parts. The full bill of materials is listed on this page.
Where can I download the Iolite design files?
From the jtsiomb/m68kcomputer repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Iolite design in my own project?
Yes, under the terms of its CC-BY-SA-4.0 license, which jtsiomb chose for the repository.
Can I test firmware for the Iolite 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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