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A docs/theory-of-operation.md

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+# Theory of operation
+
+Wireless probes measure ambient temperature, humidity and pressure using a Bosch
+Sensortec BME280 sensor.
+A data packet is then created according to the custom [protocol](protocol.md).
+This packet is then transmitted over a 434 MHz radio using on–off keying (OOK)
+modulation.
+The receiver listens for packets and displays the data from multiple probes on
+its epaper display.