2 layers111.8 × 33 mm
2 layers114.3 × 35.6 mm
Bela input
x37v/bela_modularA modular level interface for the bela beagle bone black cape
- Size
- 114.3 × 35.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 67
- Nets
- 44
- Pads
- 175
- Tracks, vias
- 399, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 5 Dec 2016
- Updated
- 26 Apr 2017
Overview
Bela input is an open-source printed circuit board by x37v, from the x37v/bela_modular repository on GitHub. It is a 2-layer board of 114.3 × 35.6 mm with 67 parts on 44 nets, routed with 399 tracks and 0 vias.
Its parts include 35 resistors, 16 capacitors, 3 ICs and 3 connectors. It belongs with the interfaces and adapters boards of this library.
README
README.mdbela_modular
A modular level interface for the bela beagle bone black cape, kicad projects.
bela is a cape for the beagle bone black
- based off the audio expansion cape
- hardware info
Pin mappings
The digital i/o is mapped as such:
| Bela # | Board | Note |
|---|---|---|
| 00 | in 1 | |
| 01 | in 2 | |
| 02 | in 3 | |
| 03 | in 4 | |
| 04 | digtial in enable | pull low to enable |
| 05 | vfd ctrl enable | pull low to enable |
| 06 | encin2-btn | |
| 07 | encin2-b | |
| 08 | out 1 | |
| 09 | out 2 | |
| 10 | encin2-a | |
| 11 | out 3 | |
| 12 | out 5 | |
| 13 | out 4 | |
| 14 | out 7 | |
| 15 | out 6 |
VFD IO
| P8 | gpio | note | |
|---|---|---|---|
| 12 | ctrl enable | 1_12 | mapped in bela software |
| 14 | digital out enable | 0_26 | |
| 31 | P busy in | 0_10 | |
| 34 | vDE | 2_17 | |
| 35 | CS2 | 0_8 | |
| 36 | CS1 | 2_16 | |
| 37 | /RD and RW | 2_14 | |
| 38 | /WR and RS | 2_15 | |
| 39 | D7 | 2_12 | |
| 40 | D6 | 2_13 | |
| 41 | D5 | 2_10 | |
| 42 | D4 | 2_11 | |
| 43 | D3 | 2_8 | |
| 44 | D2 | 2_9 | |
| 45 | D1 | 2_6 | |
| 46 | D0 | 2_7 |
Errors/rework
The digital 'extra' board from 3/17 requires a rework for the digital out and control enable pins [P8 12 and 14]. These should be detached from 5V and attached to 3.3V.
Parts
67| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 27k4 | xnorman:Resistor_Horizontal_RM10mm-xnorman | R17, R18, R19, R20, R21, R22, R23, R24, R25, R26, R27, R28 |
| 8 | 20k | xnorman:Resistor_Horizontal_RM10mm-xnorman | R5, R6, R7, R8, R9, R10, R11, R12 |
| 8 | 330pF | Capacitors_ThroughHole:C_Rect_L4_W2.5_P2.5 | C1, C2, C3, C4, C5, C6, C7, C8 |
| 6 | 10n | Capacitors_ThroughHole:C_Rect_L4_W2.5_P2.5 | C11, C12, C13, C14, C15, C16 |
| 5 | 10k | xnorman:Resistor_Horizontal_RM10mm-xnorman | R13, R14, R15, R16, R33 |
| 4 | 100k | xnorman:Resistor_Horizontal_RM10mm-xnorman | R1, R2, R3, R4 |
| 4 | 16k2 | xnorman:Resistor_Horizontal_RM10mm-xnorman | R29, R30, R31, R32 |
| 4 | 1uF | Capacitors_ThroughHole:C_Rect_L4_W2.5_P2.5 | Cci1, Cci2, Cci3, Cci4 |
| 4 | MountingHole_3.2mm_M3 | Mounting_Holes:MountingHole_3.2mm_M3 | REF1, REF2, REF3, REF4 |
| 2 | 10uF | Capacitors_ThroughHole:C_Radial_D5_L11_P2 | C9, C10 |
| 2 | TL074 | Housings_DIP:DIP-14_W7.62mm_LongPads | U1, U2 |
| 2 | bead | xnorman:Resistor_Vertical_RM5mm-xnor | R34, R35 |
| 1 | 30k1 | xnorman:Resistor_Horizontal_RM10mm-xnorman | RinF1 |
| 1 | MTA-156-4 | mta-156:MTA-156-4 | P1 |
| 1 | TL071 | Housings_DIP:DIP-8_W7.62mm_LongPads | U3 |
| 1 | TRIM | trim:trimmer | TR1 |
| 1 | in_modular | Pin_Headers:Pin_Header_Straight_2x04 | P2 |
| 1 | out_bela | Pin_Headers:Pin_Header_Straight_2x04 | P3 |
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Questions
How big is the Bela input PCB?
It measures 114.3 × 35.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Bela input use?
67 parts. 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 Bela input KiCad files?
From the x37v/bela_modular repository on GitHub, at the commit this page was made from: the board is input/bela-input.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bela input design in my own project?
Its repository states no licence, so its author keeps all rights: ask x37v before reusing the design.