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RADIO

Quadrature Sampling SDR Receiver Breadboard

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UPDATED 2026-08-08
TYPEBreadboard
USE-CASESdr Receiver Breadboard
EXAMPLEQuadrature Sampling SDR Receiver Breadboard
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CASE ANALYSIS

Scenario

Building a direct-conversion SDR receiver that requires I/Q baseband signals for digital signal processing, using relay modules as sampling switches controlled by an ESP32 microcontroller.

Key decisions

  • Use two relay modules (module relay) to individually sample I and Q channels from the antenna signal.
  • Store sampled voltages in electrolytic capacitors, then read with ESP32's ADC (pins D34, D35).
  • Control relay timing via ESP32 GPIOs (D25, D26) to implement 90-degree phase offset for quadrature sampling.

When to reuse this

Suitable for educational demonstrations of SDR sampling concepts using off-the-shelf components, without specialized RF integrated circuits.

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