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Add README for IO Board

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Frederik Walk 2023-07-22 00:27:18 +02:00
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MIT License
Copyright (c) 2023 Frederik Walk
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the “Software”), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# DonConIO - Signal Conditioning for the DonCon2040
This board hosts a Seeed Studio XIAO RP2040 microcontroller unit and provides signal conditioning for the piezo drum triggers. The conditioning circuit is reverse engineered from the *V260 SIF PCB* found in the original arcades. This is also the main reason why this board uses mainly through hole parts ... for *authenticity*.
![DonConIO PCB](board.jpg)
## Sensors
The arcade drum uses *Sensatec GSS-4SD* piezo impact sensors. While those are only available as expensive arcade spare parts, the *GSS-4SA* and *GSS-4SC* variants used in this build can be readily ordered directly from the manufacturer. My guess here is that the *D* variant only uses a different cable and connector, but who knows ...
You can also try your luck with any generic piezo, in this case you might have to tune the filters and amplification factor.
## Note
This board uses the internal ADCs of the RP2040. Those however are pretty noisy and have a static offset of around +25mV. I'm currently working on a board revision with support for an external ADC and reference voltage source, hopefully improving sensitivity. Stay tuned.
## Bill of Materials
| **Reference** | **Description** | **Digikey Part** | **Notes** |
| ----------------------------------------------------- | :---------------------------: | :----------------------: | :----------------------------------------------------------------------------------------------------------------------------------------------: |
| J6, J7 | Seeed Studio XIAO RP2040 | - | |
| U1, U2, U3, U4 | TL072CP JFET OpAmp | 296-1775-5-ND | |
| PS1 | +/-12V DC to DC Converter | 2725-A0512S-1WR3-ND | |
| C1, C3, C5, C7 | 1nF Mylar/Polyester Capacitor | 493-14299-ND | |
| C2, C4, C6, C8 | 0.47µF Tantalum Capacitor | 478-1901-ND | |
| C9-C16 | 100nF Ceramic Capacitor | BC1084CT-ND | |
| C17 | 4.7µF Electrolytic Capacitor | 1189-1421-ND | |
| C18, C19 | 1µF Electrolytic Capacitor | 50YXJ4.7M5X11-ND | |
| D1, D2, D5, D7, D8, D11, D13, D14, D17, D19, D20, D23 | 1SS133M Small Signal Diode | 1SS133MR0GCT-ND | While the 1SS133M is probably more *authentic*, a 1N4148 will probably just work as well. |
| D3, D4, D9, D10, D15, D16, D21, D22 | BAT43 Schottky Diode | 112-BAT43-TAPCT-ND | |
| D6, D12, D18, D24 | 1N5226B 3.3V 20mA Zener Diode | 1N5226BFSCT-ND | |
| R1, R10, R19, R28 | 1MΩ Resistor | 13-MFR-25FTE52-1MCT-ND | |
| R2, R11, R20, R29 | 4.7kΩ Resistor | 13-MFR-25FRF52-4K7CT-ND | |
| R3, R12, R21, R30 | 100kΩ Resistor | 13-MFR-25FRF52-100KCT-ND | |
| R4, R13, R22, R31 | 100Ω Resistor | 13-MFR-25FRF52-100RCT-ND | |
| R5, R14, R23, R32 | Wire brigde | - | Can be used as a voltage divider together with R6, R15, R24, R33 to scale down the signal before the buffer stage. This will reduce sensitivity. |
| R6, R15, R24, R33 | 5.1kΩ Resistor | 13-MFR-25FRF52-5K1CT-ND | If you add the Resistor for the voltage divider, make sure to reduce this one so the sum stays at 5.1kΩ |
| R7, R16, R25, R34 | 10kΩ Resistor | 13-MFR-25FRF52-10KCT-ND |
| R8, R17, R26, R35 | 1kΩ Resistor | 13-MFR-25FRF52-1KCT-ND |
| R9, R18, R27, R36 | 300Ω Resistor | MFR-25FRF52-300R |
| J1, J2, J3, J4 | 2Pin S2B-PH-K-S Connector | 455-1719-ND | PHR-2 plus SPH-002T-P0.5L is the counterpart |
| J5 | 5Pin S5B-PH-K-S Connector | 455-1722-ND | PHR-5 plus SPH-002T-P0.5L is the counterpart |

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