Feed on

Uses the Nokia 3120 keypad with an ATtiny261 to send an SMS. View the original post here.

(version 1.0 pictured)

(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

Parts Required

– 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)


Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License.

Comments are closed.