Birthday clock - second iteration of the clock, that I have build. The main goal of this project was to build a clock that uses low-power features of LPC812 microcontroller. Changes form the first version:
- Updated and optimised schematics.
- Smaller housing.
- Rotary encoder instead of buttons.
- Powered by much bigger capacity Li-Ion batteries.
- Touch sensor to turn backlight.
- Birthday notification
A clock built using
- NXP LPC812M101JD20 ARM Cortex-M0+ microcontroller (SO20 package).
- NXP PCA2129T Real Time Clock (SO16 package).
- LCD from Ericsson GA628 mobile phone (controller chip: Philips PCF2103)
- CSI 24C32WI 32kbit (4Kbytes) EEPROM (SO8 package).
- 3V Microchip MCP1702 Low Quiescent Current LDO Regulator (SOT-23A package).
- 5V Microchip MCP1702 Low Quiescent Current LDO Regulator (SOT-23A package).
- Resistors and capacitors (1206 package).
- Rotary encoder and 2 LEDs.
- Touch sensor TTP223 (SOT-23-6L package).
Birthdays
- Capacity: 100 entries.
- Stored in EEPROM.
- When there is a birthday, yellow LED blinks, in the menu you can see who has it.
- Multiple birthdays on the same day are supported.
- The LCD is described in my othe post: Ericsson GA628 LCD with Bus Pirate
- Microcontroller, RTC and LCD are powered from 3V voltage regulator.
- LCD is also powered from 5V voltage regulator.
- Using 2 Li-Ion rechargable batteries connected in series.
- Communication between micro-controller and peripherals is done using I2C bus.
- Clock is updated every second or minute.
- Between updates, microcontroller is in Power-down sleep mode.
- The board is powered from 2 Li-Ion rechargable batteries (capacity 2400mAh)
- Average current consumption is 65µA (optional backlight adds 10µA)
- Stack size is increased from 0x100 bytes to 0x200 bytes.
- ARM Compiler 6.16 because when project is compiled by 6.18 the resulting binary is too big.
Project uses external library LPCOpen Software Development Platform 3.02 that is available freely from NXP.