Contents
1. Introduction
2. Circuit diagram and description
2.1. Powering the solenoid
2.2. The detection circuits
2.2.1. Lines from the RC receiver
2.2.1.1 Checking the servo pulse widths
2.2.2. Microcontroller I/O lines
2.2.3. Microcontroller data communication checksums
2.2.4. Radio receiver RSSI signal
3. Circuit weaknesses
4. Failsafe software
5. Devices used in this circuit
6. Links
6.1. Failsafe articles and documents
6.2. Commercial failsafe units
6.3. Quality and reliability engineering links
6.4. Data communication error detection and correction articles
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