2 layers99.1 × 99.1 mm
At90s2323
atoomnetmarc/AVR-demo-board
AVR demo boards for old AT90S* microcontrollers.
171 parts4Apache-2.0
2 layers97.3 × 67.7 mm
SimCapSE
beantowel/SimTouch10An attempt to make a Capacitive Touch Screen Stimulator
- Size
- 97.3 × 67.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 171
- Nets
- 113
- Pads
- 375
- Tracks, vias
- 849, 146
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 10 Nov 2020
- Updated
- 10 Nov 2020
Overview
SimCapSE is an open-source printed circuit board by beantowel, from the beantowel/SimTouch repository on GitHub, published under the MIT licence. It is a 2-layer board of 97.3 × 67.7 mm with 171 parts on 113 nets, routed with 849 tracks and 146 vias.
It is built around the 74HC595 and BAV99. Its parts include 80 diodes, 24 resistors, 2 ICs and 1 connector.
Main components
2README
README.mdAn attempt to make a Capacitive Touch Screen Stimulator
This project attempts to build a device which simulates human finger touch on a capacitive touch screen. We used two high-speed double diodes to build a switch which controls the connection between the conductive surface and the ground. If "the resistance be extremely high and the parasitic capacitance extremely low in the OFF state", then the induced equivalent capacitance would be very small, thus the touch screen won't detect it.
We built an array of these switches in a PCB, so we can use an MCU to control the stimulation in a 2-D plane.
By using PWM, we tried to reach higher resolution with limited conductive pads, since the area of these pads needs to be large to gain enough capacitance.
Parts
171| Qty | Value | Footprint | References |
|---|---|---|---|
| 64 | BAV99 | Package_TO_SOT_SMD:SOT-23 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +48 |
| 64 | MountingHole_Pad | myfootprint:TCH_PAD | H1, H2, H10, H11, H12, H13, H14, H15, H16, H17, H18, H19, H20, H21, H22, H23 +48 |
| 24 | R_Small | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1, R2, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23 +8 |
| 16 | LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D65, D66, D67, D68, D69, D70, D71, D72, D73, D74, D75, D76, D77, D78, D79, D80 |
| 2 | 74HC595 | Package_SO:SOP-16_4.55x10.3mm_P1.27mm | U1, U2 |
| 1 | Conn_01x07 | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Horizontal | J1 |
Questions
How big is the SimCapSE PCB?
It measures 97.3 × 67.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SimCapSE use?
171 parts, built around the 74HC595 and BAV99. 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 SimCapSE KiCad files?
From the beantowel/SimTouch repository on GitHub, at the commit this page was made from: the board is pcb-cad/simCapSE.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the SimCapSE 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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