RADIO
Quadrature 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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breadboard-quadrature-sampling-sdr-receiver-breadboard-diagram