RSSI Receiver Setup¶

RSSI (Received Signal Strength Indicator) monitors the signal strength from the transmitter to the receiver. SparkNavi Blue supports two RSSI input methods:

1. Via any S.BUS channel (recommended — simplest wiring)
2. Direct RSSI Out pin to flight controller's RSSI IN Pin (IOMCU_SBUS_INPUT, IOMCU PB11)

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Mission Planner Parameters¶

In Mission Planner Config → Full Parameter List:

Parameter	Value	Description
RSSI_TYPE	1	Set to AnalogPin type
RSSI_ANA_PIN	103	Maps to SparkNavi Blue's RSSI analog pin
RSSI_CHANNEL	16	Transmit RSSI via S.BUS channel 16
RSSI_PIN_HIGH	3.3	Maximum voltage at full signal (SparkNavi Blue uses 3.3 V logic)

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Hardware Wiring¶

Using a FrSky X8R receiver as example: connect its RSSI pin to the SparkNavi Blue's RSSI Pin.

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Transmitter Setup (Taranis Example)¶

1. Add RSSI Input¶

In the INPUTS page, add an rssi channel with Source = RSSI, Scale = 0 dB.

2. Map to CH16 in MIXES¶

In the MIXES page, map CH16 to the rssi input you just created with Weight = 100.

This corresponds to ArduPilot's RSSI_CHANNEL = 16.

3. Verify in TELEMETRY¶

On the TELEMETRY page, after Discover new sensors, RSSI should appear. RxBt is the receiver voltage.

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Verification¶

Once configured, the rxrssi value should appear live in Mission Planner's Status page or Quick tab.

Test it by physically removing the receiver antenna — the value should drop immediately. Higher = stronger signal.

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FAQ¶

Q: rxrssi is not showing after setup?

A: Check: 1. RSSI_TYPE is set to 1 2. RSSI_CHANNEL matches the channel configured in your transmitter MIXES 3. Reboot the flight controller and re-check

Q: Why is RSSI_ANA_PIN = 103 for SparkNavi Blue?

A: 103 is the Pixhawk SBUS analog pin, which on SparkNavi Blue maps to the IOMCU PB11 pin (IOMCU_SBUS_INPUT) — that's how Blue's hwdef defines it. Other Pixhawk-class boards may use different pin numbers.

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Further Reading¶

• ArduPilot RSSI documentation
• SparkNavi Blue pinout