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Diffstat (limited to '_log/fpm-door-lock-rf.md')
| -rw-r--r-- | _log/fpm-door-lock-rf.md | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/_log/fpm-door-lock-rf.md b/_log/fpm-door-lock-rf.md index 2643c2d..1d9c05d 100644 --- a/_log/fpm-door-lock-rf.md +++ b/_log/fpm-door-lock-rf.md @@ -52,6 +52,10 @@ controller (back). Encrypted RF link between them. PCB specs: 2-layer, 1oz copper, 0.3mm traces (0.5mm for power). Ground plane. Both subsystems worked—could control servo from sensor over RF. +2025-06: NRF24L01+ on the back controller stopped working after mounting on +PCB. RFM is too close to PWM line. Fixed by soldering a large 47uF (16V) +electrolytic capacitor between VCC and ground. + Power problems became clear. Linear regulators dissipated too much heat. Sensor and servo drew 13.8mA and 4.6mA quiescent—unacceptable for battery. Servo inrush current can exceed 1A. Trace width (0.3mm), especially for servo and |