4 layers150 × 175 mm
Button board
second-string/capacitive-touch-button-board-prototype
Protoype hardware and firmware for evaluating different designs of capacitive touch buttons and reverse-mount LEDs
294 partsMIT
4 layers150 × 100 mm
Protoype hardware and firmware for evaluating different designs of capacitive touch buttons and reverse-mount LEDs
- Size
- 150 × 100 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 177
- Nets
- 172
- Pads
- 516
- Tracks, vias
- 1,172, 156
- Pours
- 7
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 19 Oct 2024
- Updated
- 19 Oct 2024
Overview
Button board is an open-source printed circuit board by second-string, from the second-string/capacitive-touch-button-board-prototype repository on GitHub, published under the MIT licence. It is a 4-layer board of 150 × 100 mm with 177 parts on 172 nets, routed with 1,172 tracks and 156 vias.
It is built around the ESP32-S3-WROOM-1-N8, SP3485CN-L and AT42QT2120-SU, with the 74HC595, ERJ-P08J471V and AS2302 among its other parts. Its parts include 78 resistors, 23 connectors, 21 diodes, 19 transistors and 15 capacitors. It belongs with the ESP32 boards of this library.
Main components
10
ESP32-S3-WROOM-1-N8
SMD,25.5x18mm-40℃~+85℃ -98.2dBm 2.4GHz 20.5dBm 355mA 3V~3.6V 95mA Bluetooth5.0 ESP32-S3 Chip On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
SP3485CN-L
SOIC-80℃~+70℃ 1 1 10Mbps 3V~3.6V Transceiver SOIC-8 RS-485 / RS-422 ICs ROHSMaxLinearRS-485 / RS-422 ICs
AT42QT2120-SU
SOIC-20-300mil1.8V~5.5V 12 Capacitive Touch SOIC-20-300mil Touch Sensors ROHSMicrochip TechnologyTouch Sensors
74HC595
SOP-16-40℃~+85℃ 1 100ns@5V,50pF 10MHz 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOP-16 Shift Registers ROHSGRShift Registers
ERJ-P08J471V
1206-55℃~+155℃ 470Ω 660mW Thick Film Resistor ±200ppm/℃ ±5% 1206 Chip Resistor - Surface Mount ROHSPanasonicChip Resistor - Surface Mount
AS2302
SOT-23-55℃~+150℃ 1 N-channel 1.5V 1W 200pF 20V 3.5A 800pF 80mΩ@2.5V SOT-23 MOSFETs ROHSAnBonMOSFETsFTSH-105-01-S-DV-TR
SMD,P=1.27mmPin HeadersSamtecGSF2301
SOT-23MOSFETsSuzhou Good-Ark Elec
GSB1C41110SSHR
USB-SMDUSB-SMD New Arrivals ROHSAmphenolUSB ConnectorsAC5FAV-AU-B
--25℃~+75℃ 3A 5P Bronze Female Gold - Circular Connectors & Cable Connectors ROHSAmphenolCircular Connectors & Cable Connectors
README
README.mdcapacitive-touch-button-board-prototype
This repo contains two designs for prototype PCBs for testing different capacitive touch button styles and different reverse-mounted LED colors and styles. While version 1.1 was indeed fabbed, built, and works, these files are made public only for reference. Do not expect to build these designs with no changes and have everything working for you.
Version 1.0 is the full 6x6 version of the board. It all fabrication outputs were generated, but the board was never fabbed due to cost. Version 1.1 is the same as 1.0 but with the top 3 rows of buttons removed to simplify the design physical size and part cost.
There is a schematic PDF and PCB layer prints PDF in the version 1.1 directory if you do not have KiCad. Version 1.1 that was built also contains generated Excel and interactive boms in its main directory or the bom/ directory.
Find the custom capacitive touch footprints in the symbols_and_footprints/ directory of each hardware version.
There is test firmware for version 1.1 in button-board_rev_1_1/bringup_firmware/. NOTE: This firmware is sloppy, terribly written, inefficient, and everything is hardcoded. It is only included as a reference, do not think that this will work for you out of the box.
Videos of example behavior are in the img/ directory.
Parts
177| Qty | Value | Footprint | References |
|---|---|---|---|
| 39 | 10k | Resistor_SMD:R_0603_1608Metric | R14, R22, R100, R101, R102, R103, R104, R105, R106, R107, R109, R110, R111, R112, R113, R114 +23 |
| 18 | 470R 1/2W | Resistor_SMD:R_1206_3216Metric | R25, R27, R29, R31, R33, R35, R37, R39, R41, R43, R45, R47, R49, R51, R53, R55 +2 |
| 18 | NMOS | Package_TO_SOT_SMD:TSOT-23 | Q2, Q3, Q4, Q5, Q6, Q7, Q10, Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q18, Q19 +2 |
| 12 | LED | LED_SMD:LED_SunLED_XZ_Reverse_Mount | D4, D5, D6, D10, D11, D12, D16, D17, D18, D19, D20, D21 |
| 9 | 0R | Resistor_SMD:R_0603_1608Metric | R1, R2, R11, R16, R17, R18, R19, R20, R21 |
| 7 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C7, C8, C11, C12, C13, C17, C18 |
| 4 | 10uF | Capacitor_SMD:C_1206_3216Metric | C1, C3, C6, C10 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 4 | R | Resistor_SMD:R_0603_1608Metric | R3, R4, R5, R6 |
| 3 | 1uF | Capacitor_SMD:C_0603_1608Metric | C2, C5, C9 |
| 3 | 74HC595 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U4, U5, U7 |
| 3 | LED | LTST-C230K:LED_LTST-C230K | D7, D8, D9 |
| 3 | LED | LED_SMD:LED_SunLED_XZ_Reverse_Mount_Cut_Pads | D13, D14, D15 |
| 3 | ~ | Button_Switch_SMD:Cap_Touch_Ring_Cutout | P4, P5, P6 |
| 3 | ~ | Button_Switch_SMD:Cap_Touch_Ring_Medium | P7, P8, P9 |
| 3 | ~ | Button_Switch_SMD:Cap_Touch_Ring_Large | P13, P14, P15 |
| 3 | ~ | Button_Switch_SMD:Cap_Touch_Ring_Small | P1, P2, P3 |
| 3 | ~ | Button_Switch_SMD:Cap_Touch_Ring_Medium_Bottom | P10, P11, P12 |
| 3 | ~ | Button_Switch_SMD:Cap_Touch_Ring_Large_Bottom | P16, P17, P18 |
| 2 | 3.3k-8k | Resistor_SMD:R_0603_1608Metric | R13, R15 |
| 2 | 47k | Resistor_SMD:R_0603_1608Metric | R108, R121 |
| 2 | 5k1 | Resistor_SMD:R_0603_1608Metric | R7, R8 |
| 2 | AT42QT2120-SU | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U10, U11 |
| 2 | LED | Diode_SMD:D_0805_2012Metric | D2, D3 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | TP1, TP2 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R12 |
| 1 | 120R | Resistor_SMD:R_0603_1608Metric | R135 |
| 1 | 22uF | Capacitor_SMD:C_1206_3216Metric | C4 |
| 1 | 3V3 | TestPoint:TestPoint_Pad_D1.0mm | TP3 |
| 1 | AZ1117CH2-3.3 | Package_TO_SOT_SMD:SOT-223 | U1 |
| 1 | CLOCK | TestPoint:TestPoint_Pad_D1.0mm | TP6 |
| 1 | Conn_01x04 | Connector_PinHeader_1.27mm:PinHeader_1x04_P1.27mm_Vertical | J4 |
| 1 | D | Diode_SMD:D_SOD-123F | D1 |
| 1 | DATA | TestPoint:TestPoint_Pad_D1.0mm | TP7 |
| 1 | ESP32-S3-WROOM-1 | PCM_Espressif:ESP32-S3-WROOM-1 | U2 |
| 1 | FTSH-105-01-S-DV-TR | FTSH-105-01-S-DV-TR:SAMTEC_FTSH-105-01-S-DV-TR | J3 |
| 1 | IO14 | TestPoint:TestPoint_Pad_D1.0mm | TP4 |
| 1 | LATCH | TestPoint:TestPoint_Pad_D1.0mm | TP5 |
| 1 | PMOS | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | SCK | TestPoint:TestPoint_Pad_D1.0mm | TP9 |
| 1 | SCL | TestPoint:TestPoint_Pad_D1.0mm | TP8 |
| 1 | SP3485CN | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U3 |
| 1 | Screw_Terminal_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal | J1 |
| 1 | USB_C_Receptacle_USB2.0_EDITED | GSB1C41110SSHR:AMPHENOL_GSB1C41110SSHR | J2 |
| 1 | XLR5_Ground | NC5FAH:NEUTRIK_NC5FAH | J5 |
Questions
How big is the Button board PCB?
It measures 150 × 100 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Button board use?
177 parts, built around the ESP32-S3-WROOM-1-N8, SP3485CN-L, AT42QT2120-SU and 74HC595. 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 Button board KiCad files?
From the second-string/capacitive-touch-button-board-prototype repository on GitHub, at the commit this page was made from: the board is button-board_rev_1_1/button-board.kicad_pcb and its schematic button-board_rev_1_0/button-board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Button board design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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