Flight Lab / Telemetry & the test bench / 05
Lesson 05 of 09 · about 6 min
A bench earns its keep when the telemetry tells the faults apart. Three injections show up here: the MPU6050 unplugged, SDA stuck low, and a packet whose CRC does not match.
An unplugged chip NACKs and leaves both lines idle high, and the driver stops emitting packets. A stuck bus holds SDA low while flight software keeps packetizing a stale sample with a good CRC. A bad CRC still has a live sensor, a moving sequence count, and a ground tool rejecting the frame.