What is it
This version is a basic door controller. It uses a keypad for entering 4 digit numbers and opens the striker for 10 seconds on success, or delays on error.
Why reinvent the wheel
These devices are everywhere, why would I create a new one. There are three reasons:
- This device is $17 for the [[Arduino_BBB?]] and $2.5 for the keypad input and I already had the striker - so cheap project. Commercial kits start around $100.
- Learn yet more about embedded programming and the Arduino
- Future expansion - the plan to add an RFID reader then network connection. Even with both of those i am only adding about $25.
- Fun - yes I said three, but fun is always there.
- Basic requirements
- Flash status LED
- Watchdog reset - todo
- Read up to 4 key presses - done
- Timeout if too long between presses - done
- Use "*" to reset anyway (force clear) - todo
- Compare 4 keys to valid inputs (first version hard coded) - done
- Open door for 10 seconds, and flash on light - done
- OR Flash light quickly twice for error - done
- Error delay is slower and slower with incorrect entries, correct one resets
- Multiple valid keys input (possibly stored in EEPROM)
- Record input/outputs, circular buffer in EEPROM
- Need to consider how to read (serial port) and how to record time? even if relative.
- Alternative inputs - such as RFID
- Network access for Logging, RFID/PIN changes and remote opening