2 layers40 × 79.6 mm
ESP32 Transmitter and Receiver
hackclub/OnBoard
💡 Join 1,000 teenagers and make your first PCB with a $100 grant!
48 parts915
2 layers72.4 × 26.6 mm
Custom Raspberry Pi Compute Module (1/3) IO Board
- Size
- 72.4 × 26.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 48
- Nets
- 74
- Pads
- 388
- Tracks, vias
- 521, 59
- Pours
- 14
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 24 May 2017
- Updated
- 2 Dec 2017
Overview
Cmio is an open-source printed circuit board by deltabeard, from the deltabeard/cmio repository on GitHub. It is a 2-layer board of 72.4 × 26.6 mm with 48 parts on 74 nets, routed with 521 tracks and 59 vias.
It is built around the AP2401S. Its parts include 13 resistors, 12 capacitors, 8 connectors, 4 ICs and 2 diodes. It belongs with the computers and single-board computers boards of this library.
Main components
1README
README.mdcmio
Note that this circuit is currently untested, as such I cannot guarantee that it will function correctly.
This is a custom Raspberry Pi Compute Module IO Board. Designed for low cost production, and a minimal set of components.
Because low cost production was the main focus of the project, this Compute Module IO board only has a subset of features in comparison to the official version. However, whilst the official version costs £115, this design aims to produce a Compute Module IO board that can be manufactured (PCB fabrication, BOM, et al) under £30.
See BOM.md for the bill of materials, and for the costs required to manufacture the latest release of this board.
This allows hobbyists an opportunity to introduce themselves to the Raspberry Pi Compute Module without breaking the bank.
Features:
- Low cost design.
- Only low cost components required.
- Simple to solder with a heat gun.
- Micro SD card slot.
- Composite video output (No HDMI).
- Bank 0 and Bank 1 GPIO pins available.
- USB On-The-Go (OTG) support.
- Micro USB power input.
- Fully open source (KiCad files, etc. all available) under TAPR Open Hardware License.
A most excellent reset button!Removed in v0.5
Compatibility with the Raspberry Pi GPIO header was removed after v0.2 to simplify the design and reduce cost of production.
* Prices correct at the time of writing, are in Pound Sterling and include VAT.
Using this Repository
Note that only tagged releases should be used for manufacture (see the releases page). Other commits should be deemed as work in progress.
Releases marked as "Pre-release" are not fully tested, and should not be used. To this date, no release version is fully working unfortunately.
Roadmap
Version v1.0 will denote a fully working board.
Parts
48| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 100k | Resistors_SMD:R_0805_HandSoldering | R1, R2, R7, R8, R9, R10, R11, R12 |
| 5 | TEST | foot:Measurement_Point_Round-SMD-Pad_Small | TP1, TP2, TP3, TP4, TP5 |
| 4 | 4.7uF | Capacitors_SMD:C_0805_HandSoldering | C1, C2, C5, C6 |
| 3 | 47uF | Capacitors_Tantalum_SMD:CP_Tantalum_Case-A_EIA-3216-18_Reflow | C7, C10, C12 |
| 2 | 0.1uF | Capacitors_SMD:C_0805_HandSoldering | C8, C9 |
| 2 | 1uF | Capacitors_SMD:C_0805_HandSoldering | C3, C4 |
| 2 | 2.2uH | Inductors_NEOSID:Neosid_Inductor_SM-NE29_SMD1008 | L1, L2 |
| 2 | 2N7002 | TO_SOT_Packages_SMD:SOT-23 | Q1, Q2 |
| 2 | 470R | Resistors_SMD:R_0805_HandSoldering | R5, R13 |
| 2 | AP3417B | TO_SOT_Packages_SMD:SOT-23-5_HandSoldering | U1, U2 |
| 1 | 0.1uF | Capacitors_SMD:C_0805 | C11 |
| 1 | 10k | Resistors_SMD:R_0805_HandSoldering | R6 |
| 1 | 200k | Resistors_SMD:R_0805_HandSoldering | R3 |
| 1 | 450k | Resistors_SMD:R_0805_HandSoldering | R4 |
| 1 | AP2138 | TO_SOT_Packages_SMD:SOT-23 | U3 |
| 1 | AP2401 | Housings_SSOP:MSOP-8_3x3mm_Pitch0.65mm | U4 |
| 1 | BANK0 | Pin_Headers:Pin_Header_Straight_2x15_Pitch2.54mm | J2 |
| 1 | BANK1 | Pin_Headers:Pin_Header_Straight_2x11_Pitch2.54mm_SMD | J6 |
| 1 | Micro_SD_Card_Molex_47309-2651 | foot:Molex_Micro_SD_47309-2651 | J7 |
| 1 | PWR LED | LEDs:LED_0805 | D1 |
| 1 | RUN | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | J8 |
| 1 | Raspberry Pi Compute Module 1/3/3L | foot:CM3_Socket_SODIMM_DDR1-2_TE_1473149_4_NoHole_NoEndSilkS | J4 |
| 1 | STATUS LED | LEDs:LED_0805 | D2 |
| 1 | TVOUT | foot:RCA_PHONO | J5 |
| 1 | USB_OTG | foot:Molex_Right_Angle_SMT_TypeB_MicroUSB_105017_CircularOnly_annular_fix | J3 |
| 1 | USB_POWER | foot:Molex_Right_Angle_SMT_TypeB_MicroUSB_105017_CircularOnly_annular_fix | J1 |
Questions
How big is the Cmio PCB?
It measures 72.4 × 26.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Cmio use?
48 parts, built around the AP2401S. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Cmio KiCad files?
From the deltabeard/cmio repository on GitHub, at the commit this page was made from: the board is src/cmio.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Cmio design in my own project?
Its repository states no licence, so its author keeps all rights: ask deltabeard before reusing the design.
Similar boards
- 2 layers
Demo
adamws/kicad-kbplacer
KiCad plugin for automatic keyboard's key placement and routing
48 parts547GPL-3.0 - 2 layers18.8 × 18.1 mm
- 2 layers48.1 × 115.6 mm
- 2 layers106 × 55 mm
Endcap
softerhardware/Hermes-Lite2
A second generation low-cost amateur HF software defined radio transceiver.
48 parts384 - 2 layers42.8 × 88 mm
18650 pcb
CRImier/MyKiCad
My KiCad boards. Can't be bothered uploading individually anymore, so here you go.
48 parts253GPL-3.0 - 2 layers34 × 44 mm
Clk lo buffer
loxodes/vna
Under development open hardware microwave vector network analyzer
48 parts205 - 2 layers70.6 × 189.2 mm
Nano
fellesverkstedet/fabricatable-machines
Motion systems for flexible digital fabrication and research. Easy to fabricate and customize. Documentation: https://github.com/fellesverkstedet/fabricatable-machines/wiki
48 parts175