Wiring for Replacement Remote for Logitech Z5300 Surround Sound System
| origin | destination | color | function |
|---|---|---|---|
| Z5300 1 | headphone jack ground | brown | headphone common |
| Z5300 2 | headphone jack tip | red | headphone left |
| Z5300 4 | headphone jack ring | yellow | headphone right |
| Z5300 6 | ESP32 +5v | blue | +5 power |
| Z5300 7 | ESP32 GND | violet | common |
| Z5300 11 | Q1 collector (U1 13) | brown | standby |
| Z5300 12 | Q2 collector (U1 2) | red | mute |
| Z5300 13 | Q3 collector (U1 10) | orange | matrix |
| Z5300 14 | ESP32 GPIO22 | yellow | SCL |
| Z5300 15 | ESP32 GPIO21 | green | SDA |
| Q1 base (U1 12) | R1 pin 1 | n.a. | base drive current |
| Q2 base (U1 3) | R2 pin 1 | n.a. | base drive current |
| Q3 base (U1 9) | R3 pin 1 | n.a. | base drive current |
| R1 pin 2 | ESP32 GPIO12 | n.a. | base drive voltage |
| R2 pin 2 | ESP32 GPIO17 | n.a. | base drive voltage |
| R3 pin 2 | ESP32 GPIO26 | n.a. | base drive voltage |
| Q1 emitter (U1 11) | ground | n.a. | common |
| Q2 emitter (U1 4) | ground | n.a. | common |
| Q3 emitter (U1 8) | ground | n.a. | common |
| package substrate (U1 1) | ground | n.a. | common |
| Rotary Encoder CLK | ESP32 GPIO13 | orange | quadrature phase 1 |
| Rotary Encoder DT | ESP32 GPIO15 | green | quadrature phase 2 |
| Rotary Encoder SW | ESP32 GPIO12 | black | encoder push button |
| Rotary Encoder +V | ESP32 +3.3V | blue | encoder pullups |
| Rotary Encoder GND | ground | slate | common |
| C1 + | ESP32 +5V | n.a. | +5V power |
| C1 - | ground | n.a. | common |
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R1, R2, R3 = 510 Ω ¼ Watt carbon comp
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C1 = 4700 µF 10V aluminum electrolytic
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Q1, Q2, Q3 = any general purpose NPN BJT, e.g. 2N3904, 2N2222, etc.
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U1 is a 14 pin dip with four NPNs in it from my junkbox.
- The ESP32 board supplies the 5V to 3.3V regulator.
William Dudley
May 10, 2025
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