Uses the Nokia 3120 keypad with an ATtiny261 to send an SMS. View the original post here.
(version 1.0 shown in video)
v1.1 (29 January 2012) – Download
- Uses ATtiny261 to remove the extra transistor / mosfet circuit
- Uses a ULN2003A instead of 4 transistors
- Use a spare output on a ULN2003A to turn the phone on when we want to send an SMS
therefore saving the battery until we need it
- Use the watchdog timer instead of delay_ms
v1.0 (29 December 2011) – Download
- Initial Release
How to use
Power on ATtiny261, it will power on the mobile, start sending the predefined SMS and turn off the phone.
Build your own
- ATtiny261 or ATtiny261A DIP20 (1) – ATTINY261-20PU/ATTINY261A-PU [IC2]
- NPN Darlington Array DIP18 (1) – ULN2803A [Q1]
- NPN Darlington Array DIP16 (1) – ULN2003A [Q2]
- 10K Resistor 1/8W (5) – [R1]
- 0.1uF Capacitor (1) – [C1]
- 3V CR2032 coin cell (1)
- Coin cell battery holder (1)
This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License.