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| -rw-r--r-- | README.txt | 26 |
1 files changed, 23 insertions, 3 deletions
@@ -1,4 +1,24 @@ -The carrier frequency of the radio module is 433MHz. +SMART HOME + +This is a collection of projects I'm currently working on to make our home +smarter. The project is in its early stages. This project considers efficiency +and environmental friendliness as part of the problem constraints. That means +'working' solutions aren't enough. They must be efficient. + +THE DOOR LOCK + +The door lock project aims to drive my door lock using a fingerprint sensor +module (FPM). In its current version, the front of the door has FPM connected +to an ATmega328P microcontroller. The back of the door has a servo connected to +another ATmega328P. Both modules have 2.4GHz NRF24L01+ RFMs connected to them. + +When the FPM authenticates a user, the MCU establishes a secure connection with +the back of the door, exchanges a session key, and transmits a lock/unlock +command to the servo. The wireless protocol allowed me to get it working with +modifying our old Japanese door lock. I wrote all the firmware and drivers of +this project from scratch. + +Although I designed this around RFM to learn more about RFM, the architecture +can be made more power-efficient if I toss the RFMs. I'm in the midst of making +these changes to the system. -Arduino Uno without sleep: 28.5 mA draw -Arduino Uno power down: 18.4 mA draw |