Taiko_Stuff/DonCon2040
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Update IO Board Readme

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Frederik Walk 2023-08-09 21:58:24 +02:00
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@ -12,31 +12,36 @@ You can also try your luck with any generic piezo, in this case you might have t
## 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.
This board does not use the internal ADCs of the RP2040 since those are pretty noisy and have a static offset of around +25mV. You can however still skip the external ADC and level-shifter and connect the signals directly to ADC pins of the XIAO RP2040 if you want to save some cost.
## 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 | |
| U5 | MCP3204 12bit SPI ADC | MCP3204-CI/SL-ND | |
| U6 | MCP1541 4.09V Voltage Reference | MCP1541T-I/TTCT-ND | |
| U7 | TXB0104 4-Bit Bidirectional Voltage-Level Translator | 296-21928-1-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 | |
| C20, C22, C24, C25 | 0.1µF SMD Ceramic Capacitor | 1276-1003-1-ND | |
| C21, C23, C26 | 10µF SMD Ceramic Capacitor | 1276-6454-1-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 | |
| D6, D12, D18, D24 | 1N5229B 4.3V 500mW Zener Diode | 1N5229BFSCT-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 |
| R6, R15, R24, R33 | 5.1kΩ Resistor | 13-MFR-25FRF52-5K1CT-ND | |
| 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 |
| R37 | 10kΩ SMD Resistor | 2019-RK73H2ATTD1002FCT-ND | |
| 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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