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lhm0
A talking clock for visually impaired users. ESP32 controlled, fully offline, long battery life.
| Reference | Value | Description |
|---|---|---|
| Q1 | IRLML6401 | |
| Q2,Q3 | AO3400A | 30V Vds, 5.7A Id, N-Channel MOSFET, SOT-23 |
| U1 | W25Q128JVS | |
| U2 | USBLC6-2SC6 | |
| U3 | WiFi antenna | |
| U4 | ESP32-S3 | |
| U6 | HEF4093B | Quad 2-Input NAND Schmitt Trigger, SOIC-14 |
| U7 |
| TPS63070RNMR |
| U8 | DS3231MZ | ±5ppm, I2C Real-Time Clock SOIC-8 |
|---|
| U9 | MAX98357A | Mono DAC with amplifier, I2S, PCM, TDM, 32-bit, 96khz, 3.2W, TQFP-16 |
|---|
| BT1 | CR2032 | Single-cell battery |
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| C1,C2,C8,C10,C11,C13,C16,C19,C24,C27,C29,C31 | 100nF |
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| C3,C18,C20-C23,C30 | 10µF | Unpolarized capacitor |
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| C4,C6 | 10pF |
|---|
| C5,C7 | 3p3 |
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| C9,C14,C15,C17 | 1µF |
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| C12 | 10nF |
|---|
| C25,C26 | 22µF | Unpolarized capacitor |
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| C28 | 1nF | Unpolarized capacitor |
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| D1,D2 | SS24 | 40V 2A Schottky Diode, SMA |
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| D3 | LED | Light emitting diode |
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| J1 | USB_C_Receptacle_USB2.0 |
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| J2,J4 | Conn_01x02_Pin | Generic connector, single row, 01x02, script generated |
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| J3 | Conn_01x03_Pin | Generic connector, single row, 01x03, script generated |
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| L1,L2 | 2n2 |
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| L3 | 2.2µH | Inductor |
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| R1,R2 | 5k1 |
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| R3,R20-R23,R28 | 100k | Resistor |
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| R4-R8 | 0 |
|---|
| R9 | 22 |
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| R10-R13,R17-R19 | 10k | Resistor |
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| R14 | 20k |
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| R15,R16 | 4k7 | Resistor |
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| R24 | 470k | Resistor |
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| R25 | 150k | Resistor |
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| R26 | 1k | Resistor |
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| R27 | 2k2 | Resistor |
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| SW1 | reset |
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| SW2 | volume_knob | Rotary encoder, dual channel, incremental quadrate outputs, with switch |
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| SW3 | config | MEC 5G single pole normally-open tactile switch |
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| Y1 | 40 MHz |
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