IO Expander
About the IO Expander PCB
IO Expander is an open source PCB design by aetas, published on GitHub under the MIT license. It is a 2-layer board measuring 200 × 120 mm, with 24 components from 20 distinct parts.
From the project
PCB files for MqGateway
Schematics and PCB design for MqGateway boards.
Source files can be read with KiCad. GERBER files are available in the releases.
Read more about MqGateway on the documentation site.
If you have found any problem with the PCB projects - please create an issue in aetas/mqgateway repository.
IO Expander bill of materials (BOM)
24 components, 20 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 5V | mors_2p | 5V_OUTPUT_1 |
| 1 | 12V | mors_2p | 12V_OUTPUT_1 |
| 1 | DC 5/12V | dc_socket | DC_JACK_1 |
| 4 | MCP23017_SP | DIP-28_W7.62mm_LongPads | EXPANDER_1, EXPANDER_2, EXPANDER_3, EXPANDER_4 |
| 1 | Extra IO Connector IN | vasch_strip_5x2 | EXTRA_IO_CONNECTOR_1 |
| 1 | Extra IO Connector OUT | vasch_strip_5x2 | EXTRA_IO_CONNECTOR_2 |
| 1 | Screw_Terminal_01x02 | mors_2p | EXT_BUTTON_1 |
| 1 | StepDown_12V_5V | YAAJ_DCDC_StepDown_LM2596 | LM2596_Module_1 |
| 1 | Power switch | mors_2p | POWER_SWITCH_1 |
| 1 | RJ45 x16 | 8p8c_2x8_roomhub | RJ45x16_1 |
| 1 | RS485_JUMPERS | pin_strip_2x2 | RS485_OUT_Jumpers_1 |
| 2 | R_POWER_LED | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R_5V_POWER_LED_1, R_12V_POWER_LED_1 |
| 1 | R_EXTENDER_CHECK_LED | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R_EXTENDER_CHECK_LED_1 |
| 1 | SW_EXTRA_5V_ONOFF | SW_SPDT-3mm | SW_SLIDE_SPDT_1 |
| 1 | SW_5V_OR_12V | SW_SPDT-3mm | SW_SLIDE_SPDT_2 |
| 1 | 5V FROM STEP-DOWN | SW_SPDT-3mm | SW_SLIDE_SPDT_3 |
| 1 | 5V PWR LED | LED_D3.0mm | 5V_POWER_LED_1 |
| 1 | 12V PWR LED | LED_D3.0mm | 12V_POWER_LED_1 |
| 1 | CHECK LED | LED_D3.0mm | EXTENDER_CHECK_LED_1 |
| 1 | RS485 Connector | PhoenixContact_MC-G_04x3.50mm_Angled | RS485_CONNECTOR_1 |
IO Expander design files
The KiCad project lives in the aetas/MqGateway-PCB repository on GitHub; these links point at the commit this page was built from.
IO Expander: common questions
How big is the IO Expander PCB?
The IO Expander measures 200 × 120 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the IO Expander?
24 components, from 20 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the IO Expander design files?
From the aetas/MqGateway-PCB repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the IO Expander design in my own project?
Yes, under the terms of its MIT license, which aetas chose for the repository.
